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Falcon-
professor emeritus
Reged: 09/11/09
Posts: 699
Loc: Gambier Island, BC, Canada
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Re: Canon 400mm or 70-200mm?
10/26/09 10:07 PM
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What mount/tracking rig do you have?
If it was me I would go for the prime 400mm lens, but it will certainly require a good solid tracking setup so you can get exposures that will do it justice. I have a 70-300 (not L glass, just a cheap and aberration-a-plenty one) and find that I only ever use it at 300mm. For *me* at least when I want to go wider then 300 I tend to be wanting to be wider then 70 too.
If however you have not-quite-perfect tracking the faster and wider 70-200 will give you the flexibility to avoid some tracking-error induced frustration.
Keep in mind that you will likely not want to run with the aperture full-open on either lens... or at least that is my experience with my cheap kit-lens and plastic 70-300 
- Sean
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Intes Micro ALTER-M606: 6" Maksutov-Cassegrain Astrograph, 912mm f/6 
Tasco 11TE-5 'Lunagrosso': 4.5" Newtonian, 900mm f/7.9
Meade DS-2114S: 4.5" Newtonian, 1000mm f/8.8 (For sale!)
Galileoscope: 50mm Achromatic Refractor, 500mm f/10
Tasco EQ-2-like mount w/ clock drive
Celestron CG-5 ASGT mount
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