[Gordy]

Hi all.


I have a 5 inch refactor f7.7 (1000mm FL) which is used for visual and deep sky imaging. I already use a 1.5x focal extender but it is not enough for those smaller objects. For this reason I am thinking of buying a Powermate to increase the image size. With the Powermate range, is there a need to match the magnification type with a scope's FL? If so, what would be the best one which would be compatible with my scope's native FL? I know whatever is chosen the f number will increase accordingly.



Thanks in advance.