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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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