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I understand what your saying atalas.
Basically the same way I've understood it.
So maybe I've misinterpreted how some people have stated their F ratio on their stats in imaging using barlows. I've also noticed some small reflectors with built in barlows state the F ratio using the focal length doubled because of the barlow.
Or am I being misled by wrongfull descriptions?
I'm actually after a slow F ratio scope but the length might throw a spanner in the works.
Slice
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