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Originally Posted by asimov
These are at prime using the F5 reflector (with 2X barlow = F10) yet their twice as big than shooting with the refractor (F8 with diagonal & 2X barlow = F24 roughly!)  ??????? |
All i know is that at prime focus, the old girl will be putting out 1800 / 6mm = 300x and with a barlow, 600x
The focal length of the refractor is not that big is it???