Hi. I was wondering if someone could help me with a question. I am imaging with a Losmandy G11, an 80mm Imaging Scope from William Optics with a Canon XTi, and...
Hi Jeff, This is actually very normal, and there's probably dozens of explanations. . .here's a few: 1) Your focusers may be shifting a bit due to the weight...
Hey, Jerry I'll be up there either Thurs or Friday this week. Still waiting for my ST402 to be delivered but maybe you can run the software by me? --Paul...
Thank you for the explanation. I was really confused by this, but what you say makes perfect sense. So I guess doing an old fasion photograph at ASA 100 for 1...
Sounds like field rotation isn't a big issue based upon what you're saying. It's almost certainly (in my opinion) a combination of focuser sag, and temp ...
By "surprisingly little" I mean the chromatic aberration and other optical flaws. . .usually shooting straight through a SCT produces some really awful stuff,...
To answer the question of field rotation, if you are auto-guiding the field rotation will be around your guide star. -Bill ... saying. ... and temp ... most ...
Thanks everyone. I think I now understand what is going on. Always something to learn with this hobby! :) Interesting comments about what ASA to use. I was...
So, I was showing some folks my recent picture of M27 at work and someone asked why brighter stars are larger on the photograph? Since the stars are supposed...
Jeff, If seeing is reasonably good, and transparency is also good, then the distribution of intensity around the center of the star is the shape of a bell...
Jeff, I agree with Jeff L. Its something everyone discovers who does guiding through a separate scope. Usually lumped together and called "flexure", meaning...
Jeff, Thanks for the comments. I keep coming back to 7331, this was my third try. Its one of my favorites but I find it challenging for some reason. This one...
Sounds good. It is interesting that my translation error seems to be about 50% of my guiding errors on a two minute exposure. I was concentrating on...
Jeff if you are using the losmandy adjustable rings with delrin tips on any of your scopes, the delrin tips are a known source of flexure, so they may or may...
I've been working on this a while, and it's finally about ready to be seen. This is something I've been wanting to do for a while, putting my images in...
We are starting a new year of school star parties and (new) volunteers are needed. SDAA members bring their scopes to various schools throughout the county...
All, After much delay, I just started adding some images to AISIG.SDAA.ORG. I would appreciate any comments. My most recent image is of M31 using Ha,L,R,G,B....
Michael, The images you posted are pretty small. Can you post larger ones? Your M31 image is missing the optics input so it did not display on the main photo ...
Hi Michael, Overall these images are quite impressive, particularly if you are just getting started!! I do have a few comments on some of the: M31 - I've never...
Jeff, Thanks so much for your comments. M31. I thought the Ha would help bring out the red in the nebula. I frankly didn't even try processing in LRGB. I...
Bob, What size do you suggest? I was following Jerry's guidelines of 655 pixels wide. Do you think 1024 pixels wide would be enough? Also, what content...
Michael, I didn't initially comment about your images because to me, they're all fabulous and way beyond my present skills and accomplishments. But I can...
Michael I think the 655 pixel is for the personal image on your personal home page. He says to keep the other images to less than 5 Mb. Shooting at 500mm I ...
I personally think that you have clipped images too much, i.e. your blacks are too black, which makes the images look a little higher contrast and unnatural. ....
I agree with Jeff. I was going to comment on the same thing. A look at the histogram shows the dark values have been clipped completely out of the image. This...
This weekend is the October 2007 Explore the Stars Program at Palomar October 12 and 13 Special thanks to Kent Richardson for giving the September Talk. Tom...
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