But also see:

   http://www.sbig.com/sbwhtmls/cmynot.htm

for an argument against using CMY filters.

Ron Wodaski
author of The New CCD Astronomy
http://www.newastro.com


-----Original Message-----
From: Terrence Magrath [mailto:tmagrath@...]
Sent: Monday, July 29, 2002 6:45 AM
To: Astroimaging_filters@yahoogroups.com
Subject: RE: [Astroimaging_filters] CMY vs RGB...


>From what I understand, CMY filters transmit more photons than do RGB
filters, and further, they provide better coverage of the spectrum.

I refer you to  <http://www.ghg.net/akelly/> Al Kelly's CCD
Astrophotography Page, www.ghg.net/akelly/  for an excellent
dissertation on the subject. Quoting the bottom line
"the total time for the WCMY composite was 9,7 minutes, while the WRGB
composite required a total of 21.3 minutes!".


-----Original Message-----
From: astrokwang2 [mailto:iam_kwanglee@...]
Sent: Sunday, July 28, 2002 11:17 PM
To: Astroimaging_filters@yahoogroups.com
Subject: [Astroimaging_filters] CMY vs RGB...




Ok...this is probably going to be asked dozens of times
in the course of this group, but...

What are the pro's and cons of RGB filters versus CMY filters?

I've looked at AVA's site, and I really like the
sample CMY and LCMY images taken through True Technology filters.

But I saw some unfavorable comments on SBIG's site regarding
CMY.

I'm using AstroArt which supports both RGB,LRGB,CMY,LCMY.

Is this a personal taste issue?  Does it depend upon
my intended targets?  Would a chiefly planetary imager
pick RBG over CMY?  And a nebula imager pick CMY over
RGB?  At this point, I'm imaging mostly fainter nebulas
and galaxies so this might make a difference in selection.

Thanks.  I would really love to hear from folks who have used
both.

Kwang






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[Non-text portions of this message have been removed]



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From what I understand, CMY filters transmit more photons than do RGB
filters, and further, they provide better coverage of the spectrum.

I refer you to  <http://www.ghg.net/akelly/> Al Kelly's CCD
Astrophotography Page, www.ghg.net/akelly/  for an excellent
dissertation on the subject. Quoting the bottom line
"the total time for the WCMY composite was 9,7 minutes, while the WRGB
composite required a total of 21.3 minutes!".


-----Original Message-----
From: astrokwang2 [mailto:iam_kwanglee@...]
Sent: Sunday, July 28, 2002 11:17 PM
To: Astroimaging_filters@yahoogroups.com
Subject: [Astroimaging_filters] CMY vs RGB...




Ok...this is probably going to be asked dozens of times
in the course of this group, but...

What are the pro's and cons of RGB filters versus CMY filters?

I've looked at AVA's site, and I really like the
sample CMY and LCMY images taken through True Technology filters.

But I saw some unfavorable comments on SBIG's site regarding
CMY.

I'm using AstroArt which supports both RGB,LRGB,CMY,LCMY.

Is this a personal taste issue?  Does it depend upon
my intended targets?  Would a chiefly planetary imager
pick RBG over CMY?  And a nebula imager pick CMY over
RGB?  At this point, I'm imaging mostly fainter nebulas
and galaxies so this might make a difference in selection.

Thanks.  I would really love to hear from folks who have used
both.

Kwang






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[Non-text portions of this message have been removed]

Ok...this is probably going to be asked dozens of times
in the course of this group, but...

What are the pro's and cons of RGB filters versus CMY filters?

I've looked at AVA's site, and I really like the
sample CMY and LCMY images taken through True Technology filters.

But I saw some unfavorable comments on SBIG's site regarding
CMY.

I'm using AstroArt which supports both RGB,LRGB,CMY,LCMY.

Is this a personal taste issue?  Does it depend upon
my intended targets?  Would a chiefly planetary imager
pick RBG over CMY?  And a nebula imager pick CMY over
RGB?  At this point, I'm imaging mostly fainter nebulas
and galaxies so this might make a difference in selection.

Thanks.  I would really love to hear from folks who have used
both.

Kwang

There's not a special page or announcement. They just silently upgraded the
LPS filters to a new transmission profile. The only difference is that the
plot of bandwidth now shows the plot for the new filter.

http://sciencecenter.net/hutech/idas/lps.htm

Ron Wodaski
author of The New CCD Astronomy
http://www.newastro.com


-----Original Message-----
From: Mike_From_Tn [mailto:mike_from_tn@...]
Sent: Saturday, July 27, 2002 8:34 PM
To: Astroimaging_filters@yahoogroups.com
Subject: [Astroimaging_filters] New Hutech LPS filter??


I have yet to find mention of this new version of the LPS filter on
the Hutech site. Could someone point me to the right place.

Thanks,

Mike
> color. I have the first version; the new version handles both
Sodium and
> Mercury lights and I've heard good reports. I'll be upgrading in
the near
> future to the new version.
>
> Ron Wodaski
> author of The New CCD Astronomy
> http://www.newastro.com
>
>



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Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/

Per a request, I have obtained cuves courtesy of AVA for Astronomik
Filters by Gerd Neumann and have posted them to a folder in files
section for reference and benefit of all.

http://groups.yahoo.com/group/Astroimaging_filters/files/Astronomik/

I also am trying to get my hands on curves for SBIG, Schuler, True
Technology and if there are any others folks are interested I would
try to get those as well.

Regards,
Kevin Brennan

I have yet to find mention of this new version of the LPS filter on
the Hutech site. Could someone point me to the right place.

Thanks,

Mike
> color. I have the first version; the new version handles both
Sodium and
> Mercury lights and I've heard good reports. I'll be upgrading in
the near
> future to the new version.
>
> Ron Wodaski
> author of The New CCD Astronomy
> http://www.newastro.com
>
>

Your welcome Kevin....  I was wondering if they got posted for I saw nothing in
the way of response, suggestion, or opinion.  Having poured a new pedestal for
my Obsession this evening I am looking forward to getting my platform on to
better tracking so I can do further comparisons of the commercial filters I
have.
Doug
   ----- Original Message -----
   From: kevinbm13
   To: Astroimaging_filters@yahoogroups.com
   Sent: Thursday, July 25, 2002 7:09 PM
   Subject: [Astroimaging_filters] Re: New images uploaded


   I would agree with your observations.  Thanks for posting them.

   KB

   --- In Astroimaging_filters@y..., "Doug Askew" <daskew@c...> wrote:
   > Morning,
   > I have just put up three JPG's into Doug's Images in the photo
   section of our Yahoo group
   http://photos.groups.yahoo.com/group/astroimaging_filters/lst?.dir=/D
   oug%27s+Images&.src=gr&.order=&.view=t&.done=http%
   3a//photos.groups.yahoo.com/group/astroimaging_filters/lst%
   3f.dir=/Doug%2527s%2bImages%26.src=gr%26.view=t
   >
   > These three images (taken 7/11/02) show detail in various degrees
   and while the Deep Red (DRF) cuts noise a little more than without a
   filter it is close.  Minus violet does nothing but cut detail in my
   opinion.  I will answer any questions (and supply more processing
   data) later as I have to head off for work and I am late.
   > Best regards,
   > Doug
   >
   >
   > [Non-text portions of this message have been removed]


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[Non-text portions of this message have been removed]

Hey Tom,

I  tend to use my filter by default when I  image under lighter skies as it
tends to lessen  skyglow as well as direct light pollution.

Cheers !!
--Ivor


At 10:52 PM 7/25/2002 +0000, you wrote:
>-Hello Ivor,
>
>     I have been using the Hutech LPS filter in a cell on the rear
>of my LX200 for a couple of months (well due to sky conditions
>several outings) and it helps greatly with light-polluted southern
>views available at my site.  I had used the 1 1/4" Hutech LPS filter
>with my STV before.  I have not yet determined when and when not to
>use the LPS filter in-line for various pointing directions; I'm
>still in an experimental stage with my ST-10XME, trying to determine
>how much longer the exposures will have to go with the LPS filter,
>depending on the target and pointing direction.  I need to do a
>system set-up in FocusMax without the LPS and add a library of bias,
>dark, and flat fields for the optical set-up without LPS, and see
>what the differences are in exposure length for the same object.
>Right now, regardless of pointing direction, I have the LPS in
>place, and it seems I have needed more exposure time in several
>instances, but I not sure whether to attribute it to the LPS or to
>hazy, dew-laden sky conditions.  From the looks of it, it could be
>Fall before sky conditions improve (long hot summer), and I get a
>chance to do some side by side comparisons.
>
>
>   Regards,
>
>          Tom Harrison
>
>-- In Astroimaging_filters@y..., Ivor Barker <ibarker@s...> wrote:
>> Just joined the group.
>>
>> Heres a good question, does anyone use LPS (Light Pollution
>Suppression) filters? if so what ones and how do you rate them.
>>
>> I have the Orion SkyGlow and am thinking that there may be better
>out there for imaging.
>>
>>
>> Cheers !!
>> --
>>  Ivor Barker 37 08 24 N 121 36 25 W
>> 10" LX 200, 10" Dob, GM-8, AT1010, Astroscan, Apex 125, SBIG ST-
>237, SX MX7-C
>>
<http://www.makos.darkhorizons.org/Astronomy>http://www.makos.darkhorizons.org/A\
stronomy
>> Sky Charts, Free Astronomy software
>>
><<http://www.stargazing.net/astropc/index.html>http://www.stargazing.net/astrop\
c/index.html>http://www.stargazing.n
>et/astropc/index.html
>
>
>Yahoo! Groups Sponsor
>ADVERTISEMENT
>
>To unsubscribe from this group, send an email to:
>Astroimaging_filters-unsubscribe@yahoogroups.com
>
>
>
>Your use of Yahoo! Groups is subject to the
<http://docs.yahoo.com/info/terms/>Yahoo! Terms of Service.


[Non-text portions of this message have been removed]

I ALSO AM GLAD RON'S IN THIS GROUP
I HAVE MY PAPER AND PENCIL READY TO TAKE NOTES  JOHN

I would agree with your observations.  Thanks for posting them.

KB

--- In Astroimaging_filters@y..., "Doug Askew" <daskew@c...> wrote:
> Morning,
> I have just put up three JPG's into Doug's Images in the photo
section of our Yahoo group
http://photos.groups.yahoo.com/group/astroimaging_filters/lst?.dir=/D
oug%27s+Images&.src=gr&.order=&.view=t&.done=http%
3a//photos.groups.yahoo.com/group/astroimaging_filters/lst%
3f.dir=/Doug%2527s%2bImages%26.src=gr%26.view=t
>
> These three images (taken 7/11/02) show detail in various degrees
and while the Deep Red (DRF) cuts noise a little more than without a
filter it is close.  Minus violet does nothing but cut detail in my
opinion.  I will answer any questions (and supply more processing
data) later as I have to head off for work and I am late.
> Best regards,
> Doug
>
>
> [Non-text portions of this message have been removed]

-Hello Ivor,

      I have been using the Hutech LPS filter in a cell on the rear
of my LX200 for a couple of months (well due to sky conditions
several outings) and it helps greatly with light-polluted southern
views available at my site.  I had used the 1 1/4" Hutech LPS filter
with my STV before.  I have not yet determined when and when not to
use the LPS filter in-line for various pointing directions; I'm
still in an experimental stage with my ST-10XME, trying to determine
how much longer the exposures will have to go with the LPS filter,
depending on the target and pointing direction.  I need to do a
system set-up in FocusMax without the LPS and add a library of bias,
dark, and flat fields for the optical set-up without LPS, and see
what the differences are in exposure length for the same object.
Right now, regardless of pointing direction, I have the LPS in
place, and it seems I have needed more exposure time in several
instances, but I not sure whether to attribute it to the LPS or to
hazy, dew-laden sky conditions.  From the looks of it, it could be
Fall before sky conditions improve (long hot summer), and I get a
chance to do some side by side comparisons.


    Regards,

           Tom Harrison

-- In Astroimaging_filters@y..., Ivor Barker <ibarker@s...> wrote:
> Just joined the group.
>
> Heres a good question, does anyone use LPS (Light Pollution
Suppression) filters? if so what ones and how do you rate them.
>
> I have the Orion SkyGlow and am thinking that there may be better
out there for imaging.
>
>
> Cheers !!
> --
>  Ivor Barker 37 08 24 N 121 36 25 W
> 10" LX 200, 10" Dob, GM-8, AT1010, Astroscan, Apex 125, SBIG ST-
237, SX MX7-C
> http://www.makos.darkhorizons.org/Astronomy
> Sky Charts, Free Astronomy software
>
<http://www.stargazing.net/astropc/index.html>http://www.stargazing.n
et/astropc/index.html

Omnipresent Ron, say hello to "Q" for me
<VBG>

--Ivor
At 02:36 PM 7/25/2002 -0700, you wrote:
><g> I'm everywhere!
>
>Ron Wodaski
>author of The New CCD Astronomy
><http://www.newastro.com>http://www.newastro.com


[Non-text portions of this message have been removed]

<g> I'm everywhere!

Ron Wodaski
author of The New CCD Astronomy
http://www.newastro.com


-----Original Message-----
From: Ivor Barker [mailto:ibarker@...]
Sent: Thursday, July 25, 2002 2:34 PM
To: Astroimaging_filters@yahoogroups.com
Subject: RE: [Astroimaging_filters] Hello


Hey Ron,
Now why did I think you would be in this group :-)

I saw your report on newastro, I am leaning towards that one as the
replacement for my SkyGlow.

Thanks
--Ivor
At 02:28 PM 7/25/2002 -0700, you wrote:
>The Hutech LPS is the best balanced in two areas: getting rid of specific
>light-pollution emission lines, and preserving reasonably well-balanced
>color. I have the first version; the new version handles both Sodium and
>Mercury lights and I've heard good reports. I'll be upgrading in the near
>future to the new version.
>
>Ron Wodaski
>author of The New CCD Astronomy
><http://www.newastro.com>http://www.newastro.com
>
>
>-----Original Message-----
>From: Ivor Barker [mailto:ibarker@...]
>Sent: Thursday, July 25, 2002 2:08 PM
>To: Astroimaging_filters@yahoogroups.com
>Subject: [Astroimaging_filters] Hello
>
>
>Just joined the group.
>
>Heres a good question, does anyone use LPS (Light Pollution Suppression)
>filters? if so what ones and how do you rate them.
>
>I have the Orion SkyGlow and am thinking that there may be better out there
>for imaging.
>


[Non-text portions of this message have been removed]



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Astroimaging_filters-unsubscribe@yahoogroups.com



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Hey Ron,
Now why did I think you would be in this group :-)

I saw your report on newastro, I am leaning towards that one as the replacement
for my SkyGlow.

Thanks
--Ivor
At 02:28 PM 7/25/2002 -0700, you wrote:
>The Hutech LPS is the best balanced in two areas: getting rid of specific
>light-pollution emission lines, and preserving reasonably well-balanced
>color. I have the first version; the new version handles both Sodium and
>Mercury lights and I've heard good reports. I'll be upgrading in the near
>future to the new version.
>
>Ron Wodaski
>author of The New CCD Astronomy
><http://www.newastro.com>http://www.newastro.com
>
>
>-----Original Message-----
>From: Ivor Barker [mailto:ibarker@...]
>Sent: Thursday, July 25, 2002 2:08 PM
>To: Astroimaging_filters@yahoogroups.com
>Subject: [Astroimaging_filters] Hello
>
>
>Just joined the group.
>
>Heres a good question, does anyone use LPS (Light Pollution Suppression)
>filters? if so what ones and how do you rate them.
>
>I have the Orion SkyGlow and am thinking that there may be better out there
>for imaging.
>


[Non-text portions of this message have been removed]

The Hutech LPS is the best balanced in two areas: getting rid of specific
light-pollution emission lines, and preserving reasonably well-balanced
color. I have the first version; the new version handles both Sodium and
Mercury lights and I've heard good reports. I'll be upgrading in the near
future to the new version.

Ron Wodaski
author of The New CCD Astronomy
http://www.newastro.com


-----Original Message-----
From: Ivor Barker [mailto:ibarker@...]
Sent: Thursday, July 25, 2002 2:08 PM
To: Astroimaging_filters@yahoogroups.com
Subject: [Astroimaging_filters] Hello


Just joined the group.

Heres a good question, does anyone use LPS (Light Pollution Suppression)
filters? if so what ones and how do you rate them.

I have the Orion SkyGlow and am thinking that there may be better out there
for imaging.


Cheers !!
--
  Ivor Barker 37 08 24 N 121 36 25 W
10" LX 200, 10" Dob, GM-8, AT1010, Astroscan, Apex 125, SBIG ST-237, SX
MX7-C
http://www.makos.darkhorizons.org/Astronomy
Sky Charts, Free Astronomy software
<http://www.stargazing.net/astropc/index.html>http://www.stargazing.net/astr
opc/index.html



To unsubscribe from this group, send an email to:
Astroimaging_filters-unsubscribe@yahoogroups.com



Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/

Just joined the group.

Heres a good question, does anyone use LPS (Light Pollution Suppression)
filters? if so what ones and how do you rate them.

I have the Orion SkyGlow and am thinking that there may be better out there for
imaging.


Cheers !!
--
  Ivor Barker 37 08 24 N 121 36 25 W
10" LX 200, 10" Dob, GM-8, AT1010, Astroscan, Apex 125, SBIG ST-237, SX MX7-C
http://www.makos.darkhorizons.org/Astronomy
Sky Charts, Free Astronomy software
<http://www.stargazing.net/astropc/index.html>http://www.stargazing.net/astropc/\
index.html

Morning,
I have just put up three JPG's into Doug's Images in the photo section of our
Yahoo group
http://photos.groups.yahoo.com/group/astroimaging_filters/lst?.dir=/Doug%27s+Ima\
ges&.src=gr&.order=&.view=t&.done=http%3a//photos.groups.yahoo.com/group/astroim\
aging_filters/lst%3f.dir=/Doug%2527s%2bImages%26.src=gr%26.view=t

These three images (taken 7/11/02) show detail in various degrees and while the
Deep Red (DRF) cuts noise a little more than without a filter it is close. 
Minus violet does nothing but cut detail in my opinion.  I will answer any
questions (and supply more processing data) later as I have to head off for work
and I am late.
Best regards,
Doug


[Non-text portions of this message have been removed]

July's issue of Sky And Telescope did a review of Coronado's
offerings!  buena suerte, Dan NM

Good choice to consider, they seem like excellent filters.  I have
used the new Ha filter and the filter holder which I have on order.
I need the low profile holder for my astrograph to allow enough back
focus.  I wish it would hold other competitive filters though.
Hopefully they can come up with a universal holder.  The holder is
super solid and very well made though.  An excellent alternative if
you don't want to flip for a motorized filter wheel or something.

KB

--- In Astroimaging_filters@y..., "eddieua2000" <eddieua@n...> wrote:
> I am considering to buy colour filters. It seems that Astronomik's
> filter set fits my budget.
> What is the your experience?
> BTW, the Astronomik's filter holder is much cheaper than most
filter
> wheels, though not autonomic. Is it worthwhile to buy the filter
> holder too?
>
> Thank you
> Eddie

I am considering to buy colour filters. It seems that Astronomik's
filter set fits my budget.
What is the your experience?
BTW, the Astronomik's filter holder is much cheaper than most filter
wheels, though not autonomic. Is it worthwhile to buy the filter
holder too?

Thank you
Eddie

Anybody care to share some of their experience with Halpha filters.
I am particularly interested in what impact the different makes have
on eposure time for say a fixed S/N ratio.

KB

Barry:
I am new in this group too. I can not comment on Coronado filters,
because I have 2 DayStar ones, an 0.45Aº ATM with a 5.1" E.R.F. and
an 0.5Aº T.Scanner with 60mm and 90mm E.R.F.
I once installed a 90mm Coronado, but I like the DayStar images
better in my system.
You can get to the Solar Observers group, there you will find a lot
on Coronado filters.
Regards,
Eric. (México)



--- In Astroimaging_filters@y..., "bsimon6151952" <bsimon615@a...>
wrote:
> I am contemplating getting one of these, likely the 60mm size along
> with either the BF15 or the BF30.  Planned use will be with my FS78
> and/or FCT76, interchanging between the two.
>
> I know there are few members in this group so far, but can anyone
> comment on this combination and does anyone have any idea what the
> wait is at present for one of these.
>
> Best regards and good luck to the new group!
>
> Barry Simon

At 09:25 PM 7/21/2002 +0000, you wrote:
>You were actually using different filter sets for each lens?  What
>filter sets were you using.  I would have thought they would have
>all been 48mm and you would have needed the stepdown rings anyway.

The camera lenses I have needed 48mm, 52mm, 58mm and 62mm, meaning I would
have needed 12 different filters! When I checked each lens with the smaller
48mm filter there would be no additional vignetting or narrowing of the
field since I already shoot stopped down two stops from wide open.

I figured this was the cheap way out and it meant only needing one set of
filters.

TOM


Tom Orff
torff@...
Astro Images at: http://users.losch.net/~torff/

You were actually using different filter sets for each lens?  What
filter sets were you using.  I would have thought they would have
all been 48mm and you would have needed the stepdown rings anyway.

KB

--- In Astroimaging_filters@y..., Tom Orff <torff@l...> wrote:
> Hi All,
>
> I joined primarily because I hope to begin imaging in RGB with my
Starlight
> Xpress MX516 camera. I currently use mainly camera lenses attached
to the
> CCD camera, which is piggybacked on my main scope. I do have the
color
> filters and recently picked up some stepdown rings so that I can
use the
> same filters on all of my lenses. Hopefully this will allow me to
use the
> same integration times for all of the lenses instead of
calibrating for
> each individual lens.
>
> If anyone has any input on this I'd appreciate it.
>
> TOM
>
>
>
> Tom Orff
> torff@l...
> Astro Images at: http://users.losch.net/~torff/

Hey Dan,

Don't feel left out.  I actually prefer BW myself.  Love the old Ha
& Schmidt camera pics on hypered Tech pan film.  I do like the look
of Ha shots.  BW with more detail.

Cheers,
KB

--- In Astroimaging_filters@y..., "poziovahim2001"
<poziovahim2001@y...> wrote:
> Hi All, just joined and don't own any filters.  I have the HX916
and
> prefer B&W.  Must be the Ansel Adams in me!  I am contemplating
> getting Al Misuik's variable Nebula filter tho!  There have been
alot
> of new filter break-thrus in the last year.  Check out the Chinese
> Refractor group's archives!  buena suerte, Dan NM

Hi All, just joined and don't own any filters.  I have the HX916 and
prefer B&W.  Must be the Ansel Adams in me!  I am contemplating
getting Al Misuik's variable Nebula filter tho!  There have been alot
of new filter break-thrus in the last year.  Check out the Chinese
Refractor group's archives!  buena suerte, Dan NM

Hi All,

I joined primarily because I hope to begin imaging in RGB with my Starlight
Xpress MX516 camera. I currently use mainly camera lenses attached to the
CCD camera, which is piggybacked on my main scope. I do have the color
filters and recently picked up some stepdown rings so that I can use the
same filters on all of my lenses. Hopefully this will allow me to use the
same integration times for all of the lenses instead of calibrating for
each individual lens.

If anyone has any input on this I'd appreciate it.

TOM



Tom Orff
torff@...
Astro Images at: http://users.losch.net/~torff/

I am contemplating getting one of these, likely the 60mm size along
with either the BF15 or the BF30.  Planned use will be with my FS78
and/or FCT76, interchanging between the two.

I know there are few members in this group so far, but can anyone
comment on this combination and does anyone have any idea what the
wait is at present for one of these.

Best regards and good luck to the new group!

Barry Simon

Welcome to all interested imaging enthusiasts.  I thought it could
benefit the whole imaging community to have a place to share
experiences with what is getting to be a plethora of filter types
and manufacturers.  Each one has its own set of characteristics and
they seem to be getting better all the time.

Kevin Brennan

Hi Kevin,
    This is a gr8! idea. I have Schuler 48mm RGB filters, used once.
It will be good to learn more as this group grows. I'll post my first
image of the crescent nebula in color soon. -MARK