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Re: [ATM] barlow focal length
Saqib Sajjad asked
> two questions about barlow lenses. as barlow is
> negitive lens so is barlow bi-concave or plano-concave
> ?
> 2nd question is what is the focal length of
> 2x,3x,4x... or even 8x barlow lens.
There are variations - but one common type is a plano-concave lens with the
concave side towards the focuser.
Focal length varies - "shorty" Barlows have shorter f.l. If you have a
Barlow lens and want to find out its f.l, this webpage may help:
http://web.telia.com/~u41105032/barlow/Barlext.htm
Nils Olof
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