Thanks for the info.
I'm thinking that since the focuser only measures 40mm at the threaded section I won't be able to get an adapter for 2" EP's and I will need to replace the whole focuser if I want to use 2" - is that correct?
Is there any substantial gain/advantage to 2" EP's over 1.25"? Would it be worth upgrading to 2"?
Quote:
Originally Posted by raymo
I would avoid 3X barlows, unless you are willing to fork out for a high quality one. 2x ones are usually superior optically, and a 3x would be useless with your 6.4mm EP anyway; The resultant magnification [about 380x if your scope is f4] would almost never be useable with that scope.
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Since it is a 200mm aperture the practical mag should be 400x should it not? - or are you saying that it won't deliver this because its (mirrors I guess) low quality?
It has a FL of 750mm and with 6.4 EP gives me 117x and I thought a 3x barlow would be ideal giving me 350x (still within the practical limit of the scope of 400x) - why would this be unuseable with this scope? I went for a 8" scope so I could get a mag in the 300's.
I also don't get the f4 bit?
TAHAIC