Hi All I have a mount controller that has the ability for me to enter a custom tracking rate for tracking comets. Could somebody tell me what is the best way...
Out of curiosity, which controller are you using? Seconds in sidereal day = ~86164. Here's an example of how to set the Temma's custom tracking rates via the...
Can a good quality T-shirt flat be taken at the following conditions: 1) During the day pointed at the clear sky? 2) During the day pointed at solid cloud...
Hi Hilary -- Yes, I was asking the question to find the most time efficient way to collect the data if in fact it makes no difference in the final quality of...
I have tried many of these techniques over the years and have come to the conclusion that the very best and cost-effective flats are still sky flats obtained...
SD Mask and sigma clipping are just fancy ways of doing averages, so the weights should be 1.2:1: 1.8. Hilary ... in ... with "A", ... differences. ... the ...
Ron/et. al.--What is the small yellow circle that shows up around a bright star or small galaxy during AutomapperII runs? I see it in all/most of the CCDSoft5...
I'm not 100% sure, but I think that the circle is used to indicate moving objects like asteroids. Ron Wodaski ... [Non-text portions of this message have been...
I'd enjoy hearing from people who have used the Meade DSI Pro II and the Meade software that utilizes Drizzle. What worked, what didn't, and what tips might...
Would someone please take a look at this photo <http://astronomy.mdodd.com/files/offset_diffraction_rings.jpg> and offer an opinion about it? I'm trying to...
Mike, offset diffraction rings usually indicate miscollimation. If the image appeared stable and the center hot spot didn't move around due to poor seeing,...
... It didn't move around. The star was rock-steady (except for some seeing-induced "swimming"), and the rings formed off-center. ... I seriously doubt if the...
... nights ... show ... the ... That image is very strange, Mike. There appear to be two airy discs in the image, one at the center, where it should be, and...
... The star was probably Elnath, but could have been Bellatrix; I don't remember for sure. It definitely was one or the other. Tonight's star was Elnath. ... ...
Mike, you did tell me it was Bellatrix for that other image, which is not a double. This leaves something point-like in the optical path causing diffraction...
I would highly recommend using the dimmer stars in a slightly unfocused image for photographic assessment of collimation. (CCDInspector essentially does this...
I would tend to agree that there is some dirt or _something_ involved here. Diffraction rings don't lie. <G> Ron Wodaski ... [Non-text portions of this message...
... Yes, I noticed that myself. I'll try adjusting the collimation screws when the seeing is more stable, hopefully tomorrow night. Mike ... Mike Dodd ...
Mike, a few weeks ago a discussion came up on the PlaneWave group about collimation. Someone reference the AstroGeeks 'MetaGuide' web site. You might want to...
May I also suggest that you also take a good quality flat? This will show anything in the optical path that should not be there. Regards, -Paul ... from ... ...
Mike Dust specks on the front objective lens should not produce the kind of spots that you would see on flats. The images you present do seem to indicate some...
... This photo <http://astronomy.mdodd.com/files/offset_diffraction_rings.jpg> and this one <http://astronomy.mdodd.com/files/diffraction_rings.jpg> were made ...
I'm thinking of purchasing an Orion ShortTube 80 telescope and Orion StarShoot AutoGuider camera for deep sky object tracking. My setup is as follows: ...
After modest success with sky flats, due to lack of experience and to continuous bad weather in central Europe, I use now an electrofluorescent sheet to...
The Short tube 80 and SSAG are a good match. I've used this combo with PHD and MaximDL with good success. You will have no trouble finding guide stars with...
To answer your questions: 1. Yes. I use the ST80 and a QHY5 ( similar I think to the Orion) on my ED80 and the 10" LX200 ( was using the ED80 as the guide on...
Hello, I am also considering external guiding scope for my C14. I already have SBIG external guiding camera and ST9XE on C14. But i would also want to do wide...
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...
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