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CF marking on lenses
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PostPosted: Fri Aug 24, 2012 1:37 pm    Post subject: CF marking on lenses Reply with quote
I've searched everywhere I can find but no help. Some of my lenses are marked CF. Most or all of these have a front element that rotates. What means CF?


PostPosted: Fri Aug 24, 2012 1:57 pm    Post subject: Reply with quote
Close focus normally, certainly on Tamrons.


PostPosted: Sat Aug 25, 2012 4:13 am    Post subject: Reply with quote
Based on http://adaptall-2.org/nomenclature/nomenclature.html
CF on Tamron means "Continuous Focus".


PostPosted: Sun Aug 26, 2012 11:50 am    Post subject: Reply with quote
"CF" on high quality projector lenses means "curved field" bye the way.
They are made to compensate the slight curvature of unglassed slides.

Example: http://www.ebay.de/itm/Leica-Leitz-Colorplan-2-5-90-90mm-fur-Rollei-Uberblendprojektoren-Projektor-/251137308183?pt=DE_Dia_Filmprojektion_Diaprojektoren&hash=item3a78f33617


PostPosted: Mon Aug 27, 2012 1:07 am    Post subject: Reply with quote
ManualFocus-G wrote:
Close focus normally, certainly on Tamrons.
Yes, my SP 28-80 is billed as a macro lens, and it bears the "CF" inscription on the front trim ring.
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