Hi Mike, Your photos show a classic Out-Of-Colimation condition. The overall shape of the diffraction rings should be round, unless there is astigmatism...
64832
Mike Dodd
doddm2001
Mar 4, 2009 7:05 pm
... I hope so; I just ordered a Glatter laser collimator, since the prospects for good seeing any seem poor any time soon. I need to resolve this issue. -- ...
64833
John Ayres
jayres11
Mar 5, 2009 4:16 am
Does anyone have experience with locking the primary mirror for a Celestron 8" SCT? I've seen many emails regarding locking 12 and 14 inch SCT's but none...
64834
Lenny Shaffer
lenny_shaffer
Mar 5, 2009 1:17 pm
Don't know if this link is still valid but it's for doing an 11 in Celestron OTA. http://www.rothritter.com/C11_Project/#Section_1 ... Clear skies- Lenny Your...
64835
Eddy
eddydel5
Mar 5, 2009 1:22 pm
... Hi John, I recently followed the above mentioned link. Although the C8 is a bit different, the main lines to follow are the same. I had pretty good results...
64836
Warren A. Keller
warhenk
Mar 5, 2009 1:32 pm
Congrats to Neil Fleming on another great APOD today! http://antwrp.gsfc.nasa.gov/apod/astropix.html Even bigger congrats to Cherry Mountain Observatory...
64837
Don
donwaid
Mar 5, 2009 1:58 pm
Hutech makes a focus lock for the C-8. Perhaps it is what you are looking for. http://www.sciencecenter.net/hutech/misc/focuslk/index.htm HTHs Don Waid ... ...
64838
Ken Harrison
ken4optics
Mar 5, 2009 4:18 pm
Umair, The SkyWatcher ED80pro is a good compromise between size, weight cost and usability. Can obviously be used for guiding and has a reputation for giving...
64839
Leonard Ellul-Mercer
apolen2001
Mar 5, 2009 4:19 pm
Well done, Neil. Great image indeed! By the way, what is C channel. First time I noticed this. Keep it up. Leonard E. Mercer. ... [Non-text portions of this...
64840
Neil Fleming
neilfleming
Mar 5, 2009 4:25 pm
Thanks, LEM! An 'L' channel typically blocks out the near IR and UV, providing cutoffs similar to the high and low end of the colored filters. A 'C'...
64841
Ken
kwilson7565
Mar 5, 2009 4:28 pm
Please help. I need a hand contoller for my LX200 classic. It seems there is a capacitor that burns out and in doing so burns the ribbon cable as well. Need...
64842
jbarnes520@...
jbarnes520
Mar 5, 2009 6:10 pm
This is the wrong group for posting a request for help with the LX200 classic. Try: http://groups.yahoo.com/group/LX200/ I've never had to replace a handbox...
64843
Leonard Ellul-Mercer
apolen2001
Mar 5, 2009 6:31 pm
Thanks, Neil, In other words, can one use no filter at all. I am saying this because in my ST10 filter wheel I left one filter thread empty, without any...
64844
Yahoo - Wodaski
rwodaski
Mar 5, 2009 6:38 pm
Yes, you can image without a filter. It will thus pass every wavelength. You need to be aware of any wavelengths that won't come to focus with any refractive...
64845
Neil Fleming
neilfleming
Mar 5, 2009 6:59 pm
Ron, this brings up an interesting point...so other than retaining a closer degree of "parfocal-ness" with the rest of the filters, why use a clear filter at...
64846
Yahoo - Wodaski
rwodaski
Mar 5, 2009 7:11 pm
I don't see any other reasons. <G> Ron Wodaski ... [Non-text portions of this message have been removed]...
64847
Leonard Ellul-Mercer
apolen2001
Mar 5, 2009 8:40 pm
Thanks to both of you (Ron & Neil), Everything is "clear" now. Clear Skies, Leonard. ... [Non-text portions of this message have been removed]...
64848
Larry Phillips
llpastro
Mar 5, 2009 9:13 pm
It should help keep some dust off of the chip itself that might accumulate during imaging. Larry...
64849
Neil Fleming
neilfleming
Mar 5, 2009 9:17 pm
Yeah, I guess that is a good point <g>. www.flemingastrophotography.com Direct from Boston - brilliant diamonds in pea soup Also check out the...
64850
Yahoo - Wodaski
rwodaski
Mar 5, 2009 9:30 pm
Many, if not most, cameras have a glass cover, and many, if not most, chips have a cover slip over the ship itself. So for many, if not most (yeah, I know, I'm...
64851
Leonard Ellul-Mercer
apolen2001
Mar 5, 2009 10:08 pm
That is exactly what I was going to say, Ron. My ST10 has a glass cover infront of the chip. That is why I pointed the fact that having no clear filter at all...
64852
Larry Phillips
llpastro
Mar 6, 2009 3:06 pm
Maybe I do not know enough about the CCD construction but I am more comfortable removing dust from the filter than from deeper in the camera. Larry...
64853
Juan
astrolopitec
Mar 6, 2009 3:47 pm
Hi The rack and pinion focuser has lots of play which translates into differential flexure. The Achilles' heel of guide scopes. But this can be easily remedied...
64854
David Plesko
davidplesko
Mar 6, 2009 3:48 pm
Leonard--The primary reason we use the clear (near-IR UNblocked) vs. no filter at all is so that we are parfocal across our filters and require little-no focus...
64855
David Plesko
davidplesko
Mar 6, 2009 3:49 pm
A couple of thoughts on these great points... - the farther we keep the dust away from the chip the better <g> but in the case of this RCOS 14.5" we have an...
64856
Rick Wiggins
meunage
Mar 6, 2009 10:23 pm
Hi, Another way to remove any focuser issues with guide scopes and eliminate extra weight is to remove the focuser all together. Iuse Borg mini-scopes for...
64857
Rick Wiggins
meunage
Mar 6, 2009 10:30 pm
Hi David, The data as you have presented is accurate (to my knowledge) and a good way to go for your application. RCs are usually set in the f8 range and...
64858
Mike Dodd
doddm2001
Mar 7, 2009 2:10 am
... That's what I did, as you can see here <http://astronomy.mdodd.com/observatory.html#GuideScope>. My guide camera is bolted to a bracket that clamps to a...
64859
mandellgl
Mar 7, 2009 1:18 pm
Hi Friends, I don't understand the advantage of working on stars in their own PS layer rather than simply using a selection. It was suggested that I can create...
64860
Don
donwaid
Mar 7, 2009 3:02 pm
Gordon, I made a video tutorial on star color processing. You may find some "tips" in the tutorial. Below is a link to the tutorial. ...
