Lee, get a copy of NEWT to check your calcs BEFORE cutting. Also, it has some great info pages on setting a scope up for visual versus photographic use. You will probably find the standard secondary is OK for your purposes, I use mine for visual and took the 1.8" secondary out and replaced it with a 1.5" to great effect visually but it would be a disaster for photography.
Cheers
P.S. Don't use tinsnips for the cut, a fine hacksaw will do a much more controlled job.
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