Alex, as someone has already mention you might be seeing the classic SCT Mirror Flop even if it is locked down. Bust since you use a Tripod I'm wondering if...
Hi, Here is an image from Memorial Day weekend of M101 and NGC5474. Taken with an STL-11000 using my VC200L at f9. This was taken over three nights, May 22-24...
This is my first venture into imaging. I have just ordered a Canon XTI body. I have the T adapter and evtension tube to mount to my C8. I just thought how am...
Hi list, Just a quick note to say- we did it! All 18 new PSI-2 tutorials are finished and streaming at IP4AP.com. We'll go to DVD, available from OPT and AVA...
Hi All, Sometime back I posted regarding anomalous readings on my Boltwood 1 Cloud Sensor. It was showing Very Cloudy all the time and varying over a few...
... Birds can cause temporary cloud readings, by sitting on the sensor. Unfortunately they often leave a permanent cloud behind. We've added an anti-bird...
I bought a mono Starshoot II and then returned it and bought a DSI II Pro instead. I wasn't able to try the Orion product on a scope but did try shooting bias...
Hello again Rich, Just a follow up on the Canon XT, I was out last Sunday night, Monday morning with it playing cat and mouse with some clouds trying for a...
The June 2009 issue of AstroPhoto Insight Magazine (Volume 5, Issue 3) is now available. In this issue you'll find: * The Five S's Part 4a: Select Warren...
Hi Doug, Yes I plan on buiding my own... Flying Lifeform Loitering Deterent Device (aka spike strip) We do have Owls, Hawks, Eagles, and other smaller flying...
Mark, very nice image. I took your advice and picked up a used XTi off of ebay. I probably won't get a chance to try it out until next week end. Any...
I want to maintain an archive of data I've gathered on various objects so that I can add to it later but I don't want to use up a large amount of space. Is...
Hi all, Just a quick announcement to say there will be a few image processing workshops offered at the Mount Lemmon SkyCenter coming up. The next one (I will...
The answer to your last question is no. And yes, sort of. Confusing? You bet. You combine images to reduce the uncertainty in the data. Typically, the best way...
... I don't know how you define "large amount" but have you considered storing the original images in a Zip file? I just tested adding .fit files to an archive...
I have just bought a used XTi body to begin AP. I have a C8, a T adapter, and SCT-T thread adapter and a 5' extension. My problem is that with no lens I need...
I found a copy of the XTI manual online. Autofocus isn't a function of the camera; it's a function of the lens. If a lens is capable of autofocus, it tells the...
Hi Rich, The 2 websites I left the links for would be a good start, both Jerry Lodriguss & Michael Covington have a couple of good books on DSLR AP as well as...
... That is correct; I have a Canon 40d. ... One way to check is to remove the camera from the SCT and hold it behind the hole in the rear cell. First turn the...
Hi, I'm new to taking flats and am using the T-Shirt flat method on a 10" LX200. Question I have is can I take successful flat indoors at dusk pointing the...
You all were right on the money. I assumed (with all that entails) that my 5" extension tube would be enough to bring me to focus. Last night between the...
With a Tee over the scope, you need plenty of light to get good flats. And the camera needs to be exactly in the same place you're going to shoot with. So if...
So long as that part of the ceiling is evenly illuminated, I don't see why not. It's a variation on the old Dome Flats. I used to use a white board for the...
Hello Ron etal, Thanks for approving my membership....again. Lost my interest a while back, but missed the action. Hope to get involved in the conversations...
During capture and image stacking at what point does adding more subs not make a difference any more? I know the more images stacked improves the signal to...
Mark, It's about achieving a good signal to noise or S/N. Though this isn't EXACTLY right, your S/N goes up as the square root of the subs assuming the same...
Here is an Excel graph which shows the diminishing returns from additional images: http://wodaski.com/ex/signal_to_noise.jpg The numbers along the bottom are...
BTW: that doubling S/N thing can readily be calculated. Generally, to double your S/N, you need 4X the present number of images. Thus, if you have 5 images,...
Having problems with message search?
Fill out this form to ensure your group is one of the first to be migrated to the new message search system.
