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Curiosity and marvel - extent of out of focus with 85mm...

BR

Glen Mills, US
542 posts

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"RE: Curiosity and marvel - extent of out of focus with 85mm f/1.4"

BR Registered since 17th Nov 2006
Mon 28-Jan-08 04:26 PM

Depth of field (DOF) is proportional to the f/no. of the optical system, so an f/1.4 lens has less DOF than an f/2.8 lens, all other things (focal length, distance to subject) being equal. My understanding is that even though you have an f/1.4 lens mounted, the viewfinder optical system has a larger f/no so the viewfinder optical system has larger DOF than the lens/sensor optical system.

Thanks for bringing up this oddity. I will have to try it out myself as I have never noticed it.

Barry

A topic tagged as having a question Curiosity and marvel - extent of out of focus with 85mm... [View all] , William Symonds , Sat 26-Jan-08 07:45 AM
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