Quote:
Originally Posted by MortonH
If you're worried about Barlows in the drawtube does that mean you won't be using a diagonal?
The FS-78 I owned for a while came with an extender but it was annoying to screw it in when needed. It also seemed a bit darker than my TV Barlow at the same amplification. The image quality through the TV also seemed a bit better. Ended up selling the extender and using TV 2x and 3x Barlows.
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Morton, the issue is MOST barlows except the Shorty versions have LONG nosepieces - a real issue with rear lens contact in Petzval designs. I have yet to see a quality shorty - the Meade one is carp. I wanted to try the newer ED element barlows, but they too have long insertion tubes.
I MIGHT try a Tak ED extender (2") in the FSQ, but it's an expensive experiment unless I can find a loaner... the Tak charts and recommendation table on their site says only the Q1.6 for the N version I have.