Hello John,
I guess because of the blooming you stacked a number of < 60 sec
exposures. Or did you remove the blooming in post-processing.
Easy for me to casually remark "Oh yes, very pretty" without
realising the difficulties the subject presents. Until one tries the
same thing oneself! Well it is pretty and I also noted that the stars
are all sharp and round and the colour looks correct (all departments
that invariably cause me trouble!). What I like is the subtleties
your image reveals in the density of the nebulosity.

clear skies,
Serena

--- In ccdimaging2@yahoogroups.com, "John A. Blackwell" <johnb@r...>
wrote:
> Hi Serena,
>
> It is a neat subject. The open cluster is loose and not very well
> condensed, and there is a definite dark nebula visible strong in
the
> northern regions. What is most challenging about this object is
that
> there are bright stars in it. With my non-antiblooming imager, all
> of them bloom in less than a minute. Also there are interesting
blue
> fringes towards the edge of the gas cloud suggesting reflections
> from the nearby stars.
>
> ~john
>
> --- In ccdimaging2@yahoogroups.com, serena_aussie <no_reply@y...>
> wrote:
> > That is a nice image John. Interesting to have a diffuse nebula
in
> > the "middle" of an open cluster -- are these related objects or
> just
> > optical coincidences? In your image I see no evidence of the
> > periphery of the cluster, so presumably it is actually a bit
> larger
> > than my star chart states (nebula 12 x 12 mins, cluster 20 mins).
> > Perhaps there is some more nebulosity that was too faint to be
> > recorded in your excellent image. Of course not visible from here.
> >
> > Serena

Serena,
I have an older shot of the same nebula/cluster taken with the wider
field of view of the FSQ-106n at f/5. The camera was essentially the
same. The older image is at:
http://www.regulusastro.com/regulus/photos/text/ic5146_rgb.html
Note the reddening (if that is spelled right, it is a miracle) of
the stars that is prominent around the nebulosity. There is a lot of
dark material there. Fascinating stuff,

~john

New image:
http://www.regulusastro.com/regulus/photos/text/ic5146_lrgb.html

Another nice clear night with reasonable seeing lead to this image.
This is the Swan Nebula, one of my favorites, because in the
eyepiece, it actually looks like its namesake. This is a
red:red:green:blue color composite image taken through a Tak CN-212
at f/3.9 with an ST-7XME. Times were short for this bright object,
though blooming was still an issue: 10:5:5:8 minutes.


http://www.regulusastro.com/regulus/photos/text/m17_rrgb.html


~johnb

Hi Serena,

It is a neat subject. The open cluster is loose and not very well
condensed, and there is a definite dark nebula visible strong in the
northern regions. What is most challenging about this object is that
there are bright stars in it. With my non-antiblooming imager, all
of them bloom in less than a minute. Also there are interesting blue
fringes towards the edge of the gas cloud suggesting reflections
from the nearby stars.

~john

--- In ccdimaging2@yahoogroups.com, serena_aussie <no_reply@y...>
wrote:
> That is a nice image John. Interesting to have a diffuse nebula in
> the "middle" of an open cluster -- are these related objects or
just
> optical coincidences? In your image I see no evidence of the
> periphery of the cluster, so presumably it is actually a bit
larger
> than my star chart states (nebula 12 x 12 mins, cluster 20 mins).
> Perhaps there is some more nebulosity that was too faint to be
> recorded in your excellent image. Of course not visible from here.
>
> Serena

That is a nice image John. Interesting to have a diffuse nebula in
the "middle" of an open cluster -- are these related objects or just
optical coincidences? In your image I see no evidence of the
periphery of the cluster, so presumably it is actually a bit larger
than my star chart states (nebula 12 x 12 mins, cluster 20 mins).
Perhaps there is some more nebulosity that was too faint to be
recorded in your excellent image. Of course not visible from here.

Serena

--- In ccdimaging2@yahoogroups.com, "John A. Blackwell" <johnb@r...>
wrote:
>
> Hello,
>
> A nice clear evening last night. There were no cataclysmics to
> monitor, so it was pretty-picture-taking-time ;-)
>
> Here is one of the Cocoon Nebula. It was taken through a Takahashi
> CN-212 in Newtonian mode with an ST-7MXE NABG (I LOVE that 89%
> efficiency!) and CFW-8 filters. Times were shorter than I would
> like, but the image is better than my previous attempts at this
> object. LRGB: 30:10:10:16 minutes. An RGB and a luminance image were
> made in MaxImDL using flats, darks and bias frames. The RGB and
> luminance were then imported into Adobe Photoshop to perform a
> luminance layer combine.
>
> http://www.regulusastro.com/regulus/photos/text/ic5146_lrgb.html
>
> ~johnb

Hello,

A nice clear evening last night. There were no cataclysmics to
monitor, so it was pretty-picture-taking-time ;-)

Here is one of the Cocoon Nebula. It was taken through a Takahashi
CN-212 in Newtonian mode with an ST-7MXE NABG (I LOVE that 89%
efficiency!) and CFW-8 filters. Times were shorter than I would
like, but the image is better than my previous attempts at this
object. LRGB: 30:10:10:16 minutes. An RGB and a luminance image were
made in MaxImDL using flats, darks and bias frames. The RGB and
luminance were then imported into Adobe Photoshop to perform a
luminance layer combine.

http://www.regulusastro.com/regulus/photos/text/ic5146_lrgb.html

~johnb

Mr Gray, you haven't specified the type of mount your SCT 10 is on.
So can't advise for you particular case. However in general terms the
answer is "no". The tracking rate is determined by the Earth's
rotation rate. Various mounts allow you to set tracking correction
rates to less than 0.5% (the G-11, for example).

Serena

--- In ccdimaging2@yahoogroups.com, mrzeta7 <no_reply@y...> wrote:
> I have an SCT 10, use ST237, and F6.3 focal reducer (high power).
The
> tracking at +/- 0.5% adjustment seems to be just too slow or just
too
> fast. Is there anyway to divide the RA motor signal with an
external
> circuit to improve tracking resolution.
>
> Those interested can check out my ET/Astronomy website at:
>
> http://home.earthlink.net/~mrzeta/amseti.html
>
> Thanks !
>
> Mr Gray

I have an SCT 10, use ST237, and F6.3 focal reducer (high power). The
tracking at +/- 0.5% adjustment seems to be just too slow or just too
fast. Is there anyway to divide the RA motor signal with an external
circuit to improve tracking resolution.

Those interested can check out my ET/Astronomy website at:

http://home.earthlink.net/~mrzeta/amseti.html

Thanks !

Mr Gray

John, the image looks fine and I can't see anything wrong with the
colour balance. Of course you know that however much and clever the
equipment you own, it is never what you would like to have. However
my filter wheel has an advantage over yours in that it has unlimited
capacity for the number of filters. I made up a little slotted box so
I can just slide the filters in (and of course, out). Of course I
have to supply the motive power and it won't change filters unless
I'm right there (so no remote operation while I'm watching a film).
However with your filter wheel you could program your focuser to
reset when the V filter is indexed into the optical path.

For clear skies you must apply to Washington ;-)

Serena

--- In ccdimaging2@yahoogroups.com, "John A. Blackwell" <johnb@r...>
wrote:
>
>
> Hello everyone,
>
> Well - I just got done playing around a bit during the last clear
> night we had.
> As many of you know, I do a lot of photometry of variable stars and
> asteroids. This has forced me to place a V-photometric filter in
the
> CCD's filter wheel. Now... filter wheels are funny things. They are
> specifically designed to prevent you, the amateur astronomer, from
> having the best of all worlds. Mine, for example has just 5 holes
to
> fill. No more. Sigh. I had started with a clear, red, green, and
> blue filter set. That's 4 filters leaving me with an empty slot for
> something else. I stuck a diffraction grating in there for
> spectroscopy. Now... where to place the V filter? I kept swapping
it
> with the grating. This means getting the phillips screwdriver out
> and taking the CFW-8 cover plate off to access the filters. What a
> pain. What to do?
>
> Well - V-filters are green. Hmmm.... Maybe replace the green filter
> for RGB imaging with the V photometric filter? Perhaps! So... that
> is what I did. This had to be tried. Imagining all sorts of
problems
> with color balance, I spent 30 minutes imaging NGC 4565, a favorite
> edge-on galaxy of mine in Coma Berenices. The results are pretty
> good! The color balance was fine. I tweaked it a slight bit away
> from the blue. Also - and this might bother me later on... the
focus
> point for the V-filter is 1.5 turns away from the R and B filters
on
> the focus knob. Sigh. Maybe I should try a full BVR filter set with
> a matching clear? Hmmm... the plot thickens.
>
> Check the image out at:
>
> http://www.regulusastro.com/regulus/photos/text/ngc4565_lrgb.html
>
> It has short times... so it is definitely not a high enough S-to-N
> ratio, but not bad.
>
> Clear Skies, please?
>
> ~johnb
> #225 Northwood Ridge Observatory

Hello everyone,

Well - I just got done playing around a bit during the last clear
night we had.
As many of you know, I do a lot of photometry of variable stars and
asteroids. This has forced me to place a V-photometric filter in the
CCD's filter wheel. Now... filter wheels are funny things. They are
specifically designed to prevent you, the amateur astronomer, from
having the best of all worlds. Mine, for example has just 5 holes to
fill. No more. Sigh. I had started with a clear, red, green, and
blue filter set. That's 4 filters leaving me with an empty slot for
something else. I stuck a diffraction grating in there for
spectroscopy. Now... where to place the V filter? I kept swapping it
with the grating. This means getting the phillips screwdriver out
and taking the CFW-8 cover plate off to access the filters. What a
pain. What to do?

Well - V-filters are green. Hmmm.... Maybe replace the green filter
for RGB imaging with the V photometric filter? Perhaps! So... that
is what I did. This had to be tried. Imagining all sorts of problems
with color balance, I spent 30 minutes imaging NGC 4565, a favorite
edge-on galaxy of mine in Coma Berenices. The results are pretty
good! The color balance was fine. I tweaked it a slight bit away
from the blue. Also - and this might bother me later on... the focus
point for the V-filter is 1.5 turns away from the R and B filters on
the focus knob. Sigh. Maybe I should try a full BVR filter set with
a matching clear? Hmmm... the plot thickens.

Check the image out at:

http://www.regulusastro.com/regulus/photos/text/ngc4565_lrgb.html

It has short times... so it is definitely not a high enough S-to-N
ratio, but not bad.

Clear Skies, please?

~johnb
#225 Northwood Ridge Observatory

This is forwarded from AAVSO HQ:

          Dear members, staff, and friends of the AAVSO. It is my
very sad duty to inform you all that Dr. Janet Mattei died at 4:20
PM today
3/22/04 at the Peter Bent Brigham Hospital after a long battle with
Acute Myelogenous Leukemia. In typical Janet fashion she fought a
heroic battle with this deadly disease for the past 7 months, but in
the past few weeks it overcame her. Last Tuesday she asked that I
inform her friends worldwide when this time came for her. Last
evening she slipped into a coma, and passed away just minutes ago.
           The AAVSO has lost a strong leader who has guided our
organization to greatness. The world of astronomy has lost a patron
of her field. Amateur astronomers the world over have lost a mentor
who bridged the world of amateurs and professionals. I, along with
many others the world over who knew her well, have lost a dear
friend who will be deeply missed.

Information about services will be forthcoming soon.

Mario Motta, MD

Well, having gone through the New Astronomy book, I was able to dig
out the old original images for the Horsehead and re-edit using much
better techniques. I have removed an annoying light pollution
gradient and made the color balance much better. The details:
9-February-2002 image.
Takahashi FSQ-106n at f/5
SBIG ST-7 nonABG with CFW-8 filters
Losmandy G-11 mount
Luminance: 60 minutes
Red: 10 minutes
Green: 10 minutes
Blue: 24 minutes
5 x 5minute each: Darks, flats and biases used in a median mode.
An RGB color composite was made in MaxImDL. Then the RGB and
Luminance were saved from MaxImDL as 16-bit TIF. They were opened in
Photoshop where the curves were adjusted, then the Luminance layer
was pasted onto the RGB as a Luminance layer. A new channel was
created with a reverse gradient to remove the light pollution. The
image was then flatenned and saved as a JPG for the web.
The only issues I am still having are with my uncallibrated monitor.
It is still hard for me to get a grasp of the luminance qualities
until I get this thing corrected. It is new... the last one blew
up :-(

http://www.regulusastro.com/regulus/photos/text/b33.html


~john

And Happy New Year to you as well, Serena!
Thanks. These images were fun - after the many nights spent hunting
down strange variable stars.  I hope you get a chance to image the
Sculptor Galaxy - it is bright and very detailed. I know you can get
an awesome image of it from "Down Under" ;-)

~john
--- In ccdimaging2@yahoogroups.com, serena_aussie <no_reply@y...>
wrote:
> John,
> Both excellent images (as always). You've tempted me to have a
look
> at Sculptor, which is nicely positioned for me. Yes Saturn. Last
> night, getting home from a New Year eve party, I tried imaging
that
> planet but of course clouds rolled in. Saturn had been clear every
> time I looked from the party. I got an image, but through light
> cloud. Hopefully there will be better opportunities.
>
> Happy New Year,
> Serena
>

Thanks for the kind words Richard. Your shots are also lovely and
very interesting on the color side. I spent quite a bit of time on
your website intrigued by the images and methods.

The CN-212 is one of my favorite, all-time telescopes. It performs
VERY well as both a Newtonian and a Cassegrain. What many people
don't know is that it is a corrected Newt with a lens assembly at
the focal point in Newt mode. This allows it to perform well for CCD
work. I use Newt mode for astrometrics of asteroids, deep sky and
lots of variable star work. The cass mode is excellent for lunar and
planetary work. Collimation in both modes is a lot easier than many
people suspect. Tuning up one mode does not hurt the other at all.
Tools come with the scope to get a good (not excellent) colimation.
Fine collimation is then done at 600x with a bright star on a good
night. I have an online review at the following URL with some more
details....
http://www.regulusastro.com/regulus/papers/takcn212/index.html

~johnb
http://www.regulusastro.com/



> That's a nice crab John. Hey how do you like the CN212? Do you use
it
> mostly as a cassegrain or as a newt? How about collimation of it
in
> Newt mode, is it difficult?
>
> Here is a Crab I shot last week in between storms. I used a C14
and
> an FLI Dream Machine camera. I also used Custom Scientific 3nm
FWHM
> [SII], Ha, and [OIII] filters. I did a second and third version
using
> an [NII] filter with the others.
>
> When you combine [SII], [NII] and Ha all of the data is in
the "Red"
> portion of the visible spectrum. Making a tricolor like I did
gives
> you some nice separation of those emission lines in a way that you
> cannot see with an RGB image. Looks weird though....
>
> [SII]=Red, Ha= Green, [OIII] = Blue
>
> http://www.rdcrisp.darkhorizons.org/m1_crab_nebula_S2HaO3_page.htm
>
> [SII] = Red, [NII] = Green, Ha = Red
>
>
http://www.rdcrisp.darkhorizons.org/m1_crab_nebula_S2_N2_ha_page.htm
>
> finally here is an image made from [NII] and Ha only. These
emission
> lines are only separated by 2nm so it was interesting to me to see
if
> my filters could really differentiate between the species:
>
> http://www.rdcrisp.darkhorizons.org/m1_crab_nebula_ha_n2_page.htm
>
>
> Happy New Year!
> Richard

--- In ccdimaging2@yahoogroups.com, "John A. Blackwell" <johnb@r...>
wrote:
> Hello,
>
> We had another nice clear (windy) night last night, so we avoided
> imaging Saturn (ohhh so tempting though!) and went for the Crab
> Nebula.
>
> http://www.regulusastro.com/regulus/photos/text/m1rgbcn212.html
>
> CN-212 ST-7 non-E non-ABG LRGB color composite. 15:10:10:24 minutes
> at -30C. This one ended up much better than last year's version
> which was too grainy (too short an integration time).
>
>


That's a nice crab John. Hey how do you like the CN212? Do you use it
mostly as a cassegrain or as a newt? How about collimation of it in
Newt mode, is it difficult?

Here is a Crab I shot last week in between storms. I used a C14 and
an FLI Dream Machine camera. I also used Custom Scientific 3nm FWHM
[SII], Ha, and [OIII] filters. I did a second and third version using
an [NII] filter with the others.

When you combine [SII], [NII] and Ha all of the data is in the "Red"
portion of the visible spectrum. Making a tricolor like I did gives
you some nice separation of those emission lines in a way that you
cannot see with an RGB image. Looks weird though....

[SII]=Red, Ha= Green, [OIII] = Blue

http://www.rdcrisp.darkhorizons.org/m1_crab_nebula_S2HaO3_page.htm

[SII] = Red, [NII] = Green, Ha = Red

http://www.rdcrisp.darkhorizons.org/m1_crab_nebula_S2_N2_ha_page.htm

finally here is an image made from [NII] and Ha only. These emission
lines are only separated by 2nm so it was interesting to me to see if
my filters could really differentiate between the species:

http://www.rdcrisp.darkhorizons.org/m1_crab_nebula_ha_n2_page.htm


Happy New Year!
Richard

John,
Both excellent images (as always). You've tempted me to have a look
at Sculptor, which is nicely positioned for me. Yes Saturn. Last
night, getting home from a New Year eve party, I tried imaging that
planet but of course clouds rolled in. Saturn had been clear every
time I looked from the party. I got an image, but through light
cloud. Hopefully there will be better opportunities.

Happy New Year,
Serena

--- In ccdimaging2@yahoogroups.com, "John A. Blackwell" <johnb@r...>
wrote:
> Hello,
>
> We had another nice clear (windy) night last night, so we avoided
> imaging Saturn (ohhh so tempting though!) and went for the Crab
> Nebula.
>
> http://www.regulusastro.com/regulus/photos/text/m1rgbcn212.html
>
> CN-212 ST-7 non-E non-ABG LRGB color composite. 15:10:10:24 minutes
> at -30C. This one ended up much better than last year's version
> which was too grainy (too short an integration time).
>
> Clear Skies,
> ~johnb

Hello,

We had another nice clear (windy) night last night, so we avoided
imaging Saturn (ohhh so tempting though!) and went for the Crab
Nebula.

http://www.regulusastro.com/regulus/photos/text/m1rgbcn212.html

CN-212 ST-7 non-E non-ABG LRGB color composite. 15:10:10:24 minutes
at -30C. This one ended up much better than last year's version
which was too grainy (too short an integration time).

Clear Skies,
~johnb

Hi there everyone,

Well, we had a nice start to the evening last night allowing for a
few good minutes of deep sky imaging. I had about 30 minutes to
capture an object I have wanted for a long time: the Sculptor Galaxy
NGC 253. This is the lowest declination object that I can image from
my location, and it suffered from a huge light pollution gradient.
Thanks to Photoshop, much of that was removed. Details: Tak CN-212
in Newt mode with an ST-7 (non-ABG non-E) at -25C for 15 minutes. A
full callibration was done. You might have to adjust your monitors
to see the fine outer detail, so a callibration GIF has been added
to the page. It's not my best, but it is a pretty object.
http://www.regulusastro.com/regulus/photos/text/ngc253.html

Clear Skies,

~john

Hello,

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Hi
           i am building a ccd camera for a Medicalimaging application.
My require is to display the LIve video on TV.
I have to interface a ccd to analong front end,timing
generator,verical drivers and adc . Does any body have a refrence
design for the CCD camera buiding . CCd resoultion should be 750*582
,output should be 480 tv lines pal .
    Can anybody suggest me a chip having all the things like Timing
generator, adc,vertical driver which can directly interfacede to ccd
and dsp .
  Thanks and regards
Rakesh Verma

Well there I was freezin in the dome when my Yahoo! Messenger buzzed
at me and a long time collaborative friend (getting his PhD in
astronomy) was there typing at me. He was freezing in North Dakota in
the university dome while imaging asteroids and wanted to know if I
had seen Comet Encke yet. I said I had heard that it was back but had
not seen it. Wellllll he gave me the coordinates, and I imaged the
rest of the night. Here are the results. It is nothing pretty, but it
is a cool and FAST moving comet.
http://www.regulusastro.com/regulus/photos/text/encke.html
Check it out. The first image is a 1 minute integration. The 2nd is a
2 minute shot and the 3rd is a 5 minute shot. They are all within the
same field, since I was guiding on the same star throughtout the
series. If you have blinking software, try it out. It is really like a
movie.

Also - it is easily seen in an 8" now. You'll need a good chart and a
current position fix. Neat comet.

Clear Skies,

~johnb

;-)  Yep - chills run down your spine!

~john

--- In ccdimaging2@yahoogroups.com, serena_aussie <no_reply@y...> wrote:
> Hi John, those are truly magnificent images. Real "Day of the
> Triffid" stuff.
>
> cheers,
> Serena

Hi John, those are truly magnificent images. Real "Day of the
Triffid" stuff.

cheers,
Serena

--- In ccdimaging2@yahoogroups.com, "John A. Blackwell" <johnb@r...>
wrote:
>
> I spent the first ten minutes of the aurora show watching them
> while on my back in the grass in the front yard... then it
> came to me: FILM THIS! So...
>
> I went inside, trying to find that old Olymous OM-1n I used to
> use for astrophotography - I found it!
>
> > These are a mix of 30 second and one minute exposures on a tripod.
> 29mm f/3.6 on iso400 film. Enjoy!
>
> http://regulusastro.com/regulus/photos/images/aurora/
>
>> Clear Skies,
>
> ~johnb

I spent the first ten minutes of the aurora show watching them
while on my back in the grass in the front yard... then it
came to me: FILM THIS! So...

I went inside, trying to find that old Olymous OM-1n I used to
use for astrophotography - I found it!

Then... I needed a lens to put on it! Where was that lens!?
Running around like a madman, I found a 28mm f/3.6 wide angle
lens. Well, now you know what I needed? FILM!

SUE!? Do you have ANY film in the house?! She actually had a roll
of 400iso Kodak Royal Gold in the refrigerator! So, I loaded up and
went out armed for the show.

These are a mix of 30 second and one minute exposures on a tripod.
29mm f/3.6 on iso400 film. Enjoy!

http://regulusastro.com/regulus/photos/images/aurora/

I do not pretty web pages around them yet, but I will in
the near future. If anyone wants really high resolution shots,
let me know, and I will email them to you (warning 4MB each).

Clear Skies,

~johnb

John, both are very nice images with impressive definition. Makes me
want to look at them myself.

Serena

> NGC 7479:  Neat arms eh?
> > NGC 7814: Sb- galaxy.  You  have to love
> that dust lane.
>
>
> Clear Skies,
>
> ~johnb

Here are a couple of new images taken last night... It was the
first clear night in many a long while. Both are galaxies in Pegasus.
Both of the objects are Autumn Favorites of mine, since
they have neat shapes.

NGC 7479: SBc galaxy. This is a 15 minute integration taken
through a Takahashi CN-212 corrected Newtonian with an
SBIG ST-7 at -20C. Images were taken in 5 minute intervals,
had dark frames subtracted, then summed. Neat arms eh?
http://www.regulusastro.com/regulus/photos/text/ngc7479_cn212_15min.html

NGC 7814: Sb- galaxy. This is a 15 minute integration taken
through a Takahashi CN-212 corrected Newtonian with an
SBIG ST-7 at -20C. Images were taken in 5 minute intervals,
had dark frames subtracted, then summed. You  have to love
that dust lane.
http://www.regulusastro.com/regulus/photos/text/ngc7814_cn212_15min.html


Clear Skies,

~johnb

I was able to do some Mars imaging last weekend under fabulous skies.
What was particularly interesting is how fast the South Polar Cap is
receding! Compared with my image taken only two weeks prior, the cap
is significantly smaller.

The result is posted here...
http://www.astrosurf.com/benschop/Main_files/Mars_09-07-2003.jpg

Imaged two weeks prior...
http://www.astrosurf.com/benschop/Main_files/Mars_08-28-2003.jpg

Toucam Pro, Sirius Optics NIR filter, Ultima 2000 8" SCT.
My other planetary images are at
http://www.astrosurf.com/benschop/PlanetaryImages.htm

Len

Heheheh! Yep! You are right. Some day I'll get a webcam... for now,
the b&w imaging of the 237 will have to do. Yes - I was really amazed
at the overall trauma caused by the fan spinning around. It doesn't
make a whole lot of difference at f/5, but at f/12 the difference is
marked.

~john
--- In ccdimaging2@yahoogroups.com, serena_aussie <no_reply@y...> wrote:
> --- In ccdimaging2@yahoogroups.com, "John A. Blackwell" <johnb@r...>
> wrote:
> >
> > Some more Mars images. >
> > ~john
>
> I have wondered how vibration free fans could be made at affordable
> prices. The improvement in definition without the fan is quite
> marked. Now all you have to do is grab a webcam to replace the astro
> CCD ;-)
> Kidding aside, you have obtained excellently detailed images.
>
> Serena

--- In ccdimaging2@yahoogroups.com, "John A. Blackwell" <johnb@r...>
wrote:
>
> Some more Mars images. >
> ~john

I have wondered how vibration free fans could be made at affordable
prices. The improvement in definition without the fan is quite
marked. Now all you have to do is grab a webcam to replace the astro
CCD ;-)
Kidding aside, you have obtained excellently detailed images.

Serena

Some more Mars images. I am slowly getting the hang of taking
planetary images, but I have to admit that it can be the most tedious
thing ever in the imaging world. Anyway, I discovered that the fan in
the ST-237 was creating enough vibration to ruin (and I mean RUIN)
anything even coming close to a good image... so I disabled the fan.
The results can be seen at:
http://www.regulusastro.com/regulus/photos/text/mars2003.html
Notice the difference between the last four (newest) images and the
prior ones. No comparison there. So...off to sleep. ;-)
All were taken through the CN-212 at cassegrain focus with a 2.5x
Barlow. Images were then stacked using Registax (excellent sw).

My new slogan: Down with fans!  ;-)

~john