Quote:
Originally Posted by Amaranthus
Ray, I'm using an ICX694, so I suspect I'm not going to get a lot of vignetting. But I'll test, see, adjust, etc. I'm in this f/4 newt game for the long haul (haven't even unwrapped my 10" Quattro CF yet!), and am willing to work to get things just right - eventually.
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enjoy the trip. The main problem with my system was diffraction effects - doubt vignetting will be a problem for you. The 10 inch f4 CF is a great scope - look forward to seeing what you can do with it.
Quote:
Originally Posted by Jason D
However, only stars that fall close to one edge of the frame might be impacted -- not the ones in the central vicinity and the opposite edge of the frame.
I did it years ago with a laser and a holographic attachment. But you need to be careful. When the source of light is below the focal plane the reflected light off the primary mirror will diverge and gives you worse reading.
Jason
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with my scope and sensor, the worst diffraction effects covered about half the field from memory (ie it was significantly compromised) - now I get some issues across much of the field, but less noticeable. Barry's scope is the same brand, so may share a similar design approach (and possibly problems).
That's a good point re the placement of the source. Also, it is often not mentioned that your eye must be in the focal plane when using a peephole to position the secondary - for similar reasons.