Originally Posted by Jon Ruyle
Yeah, I agree that the vignetting is a problem that must be solved.
Both of those are wonderful, Tim. Makes me wonder why bother with autouiding
I'm guessing you used all types of ancillary shots for these.
The 80ED has about the same aperture as your 100-400. Any thoughts on how they compare?
(I realize that the 80 ED is a bit longer, but not too much, and I would think the rebel has plenty of pixels to crop a bit)
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With my mount and the amount of weight I have on it Autoguiding for long exposures is critical. I am using a Celestron C6R-GT (CG5).
Although the 80ED is only a few mm larger than the 100-400 nothing compares to a prime lens, which is, in effect, what I am doing when attaching the camera to the telescope. And the focal length does make quite a bit of difference in the Image scale and field of view.
A lot depends on what kind of shot I am after, and the object or object within it, that will determine which lens or which telescope I use.
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