Hi All, NGC 3621, a member of the Leo spur of galaxies and is an isolated spiral After I completed my processing I looked for other images to compare. Not many...
11129
Richard Crisp
rdcrisp
Apr 30, 2012 6:36 pm
Wow, what a beauty Dale!...
11130
TK
tk251062
Apr 30, 2012 7:03 pm
According to astrometry.net this this seems to be NGC 4945. http://nova.astrometry.net/user_images/17682#annotated ...
11131
Richard Crisp
rdcrisp
Apr 30, 2012 7:36 pm
Sure looks like it to me as well TK Either way it is a beauty and way too low for me to image from Northern Calif L From: FLI_Imaging_Systems@yahoogroups.com...
11132
bakersfieldbiker
bakersfieldb...
Apr 30, 2012 7:46 pm
Beautiful shot Dale, I like everything about it! Floyd...
11133
john gleason
dvjbaja
Apr 30, 2012 9:50 pm
So this gets us back to my original question and continued understanding of the f-number myth. If the aperture is equal, how can a change in the focal length...
11134
Dale Liebenberg
dale.liebenberg
Apr 30, 2012 9:50 pm
I picked up the coordinates for NGC 3621 from TheSkyX. Plate solve confirms that the image coordinates corresponds to these coordinates, which are also the...
11135
portaball2001
May 1, 2012 12:39 pm
Hi, These two reflexion nebulae are beautifully embedded in dust in the southern constellation of Chamaeleon. 1200x1100:...
11136
Dale Liebenberg
dale.liebenberg
May 1, 2012 12:39 pm
Hi All, Yep, I had imaged both and managed to somehow mix them up during processing. Must be old age creeping up :-) I have corrected the description. Â ...
11137
Richard Crisp
rdcrisp
May 1, 2012 12:40 pm
Dale  I checked in DSS and it agrees with TK's observation  You have discovered an error in the database used by your copy of TheSkyX  I doubt that is...
11138
Richard Crisp
rdcrisp
May 1, 2012 12:40 pm
For a given aperture and a fixed pixel size, reducing the focal length (making the Fnumber faster) will speed up the accumulation of electrons in the...
11139
Richard Crisp
rdcrisp
May 1, 2012 12:40 pm
DSS or ViZier are good refences...
11140
Dale Liebenberg
dale.liebenberg
May 1, 2012 2:08 pm
Hi Richard, In case you missed my previous e-mail. It was NGC 4945 It was my mistake. I got the two mixed up during processing. NGC 3621 will follow later. Â ...
11141
Tim Khan
timkhan
May 1, 2012 2:09 pm
John, I will start with this chart, check out the areas: aperture f ratio Lambda Airy Disk Dia. microns Area u^2 remarks 305 1.44 5.50E-07 0.966 0.733 TEC...
11142
J. Manuel Briseno
juanbr
May 2, 2012 6:02 am
Gerhard, congratulations, nice picture. thanks for sharing  ________________ J. Manuel Briseño juanbr@... ________________________________ From:...
11143
gjsalyer
May 2, 2012 6:03 am
I'm considering getting a PL16803. However I'm a bit worried that its weight and image size might show a problem with my FSQ106. I've heard from several...
11144
portaball2001
May 2, 2012 10:34 am
Hi Manuel, Thank you very much :-) Gerhard...
11145
Tim Khan
timkhan
May 2, 2012 12:19 pm
The issue with the FSQ is post FF tilt is much more critical than pre FF tilt particularly at f5. I believe the solution was to eliminate the Tak focuser,...
11146
Greg Salyer
gjsalyer
May 2, 2012 3:15 pm
But is this an issue just with the ED or also with the EDX III? They are radically different. In fact, I doubt if its possible to replace the focuser on the...
11147
sjbradbury1234
May 2, 2012 3:15 pm
Here's what I had to do with my EDX III, unfortunately I have not been able to do a full test since replacing the CAA yet. Replaced focuser and CAA ...
11148
Greg Salyer
gjsalyer
May 2, 2012 3:31 pm
So you did have a problem with the EDX III model. I didn't know the focuser could be removed from this model. Thanks for the information. Greg From:...
11149
Richard Crisp
rdcrisp
May 2, 2012 7:08 pm
lots of good info in this... http://www.narrowbandimaging.com/incoming/automate2011-advanced-camera-image-sensor-technology.pdf depth of focus starts on page...
11150
Greg Salyer
gjsalyer
May 2, 2012 7:09 pm
I looked at your photo and checked the part on the Precise Parts website. Even if I have to make this change it doesn't sound like it'll be a major factor in...
11151
Tim Khan
timkhan
May 2, 2012 8:21 pm
nice find, I sent this along to some of the local group...added a note, this may lead to drinking for a better understanding ;) ...
11152
Richard Crisp
rdcrisp
May 2, 2012 9:27 pm
I'll say something about Stan Moore's understanding of SNR he wrote up in his so-called "F/number myth" later today or tomorrow when I get a chance to write...
11153
john gleason
dvjbaja
May 3, 2012 5:15 am
Ok, I can clearly understand that. Thanks!...
11154
Dale Liebenberg
dale.liebenberg
May 3, 2012 5:49 am
Is the problem not solved by just locking the focuser? Â Dale ________________________________ From: Greg Salyer <salyer@...> To:...
11155
john gleason
dvjbaja
May 3, 2012 6:41 am
Greg, You might simply begin by attaching an Atlas Focuser to your FSQ EDX III CAA as is and see what happens. If that does not work you can go the route...
11156
sjbradbury1234
May 3, 2012 6:44 am
Yes I'm certain the focuser needed replacement along with the CAA. You might get away with leaving the focuser on if it were locked in place and the metal...
11157
echesak@...
echesak...
May 3, 2012 1:54 pm
Interesting... I've got a 106ED with CAA. It has the ML11K with the 65mm shutter and a fully loaded 2-7 filter wheel. http://smu.gs/K2dfal I'm not sure how...
