Testing ScopeStuff Canon EOS-> 2" nose-piece adapter
http://osastrolog.blogspot.com/2008/06/telescopes-with-dslr.htmlFor telescopes with a 2" focuser, the increase in brightness is quite significant! I would guess 1.25" focuser is good for regular CCD chip size only. For the larger CMOS chip in EOS450 (22 x 14 mm ?) , 1.25" might be too narrow for the FOV.Have you compare standard M42 (1.6") opening ?
AC I don't have something in between 2" and 1.25", either 2" unobstructed or 1.25" to T-thread. Perhaps to adhere a "42-mm opening paper mark" inside the 2-inch focuser and try the experiment. 原帖由 mca 於 2008-6-19 18:38 發表 http://forum.hkas.org.hk/images/common/back.gif
Perhaps to adhere a "42-mm opening paper mark" inside the 2-inch focuser and try the experiment.
Good suggestion, will re-do the whole thing soon.
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