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I want to use the F3.3 for astrophotography and at in the instructions it does say not for visual use. I thought that by using the spacer to set to f5 that it could be used. On a sct, for me, I find F10 too dim except for planetary viewing. I intend to by a reducer at 6.3 for normal visual astronomy and use my 3.3 when taking photos. That is when I get my sct.
Regards
Kon
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