Thread: Quad lens - what's it for?
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Old 6th Jun 2020, 7:24 am   #26
jimjim1
Triode
 
Join Date: Sep 2018
Location: London, UK.
Posts: 16
Default Re: Quad lens - what's it for?
6, 9, 13, 17.5 may be the focal lengths of the lenses.
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