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11-26-2013, 02:06 AM   #1
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Join Date: Jun 2013
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Using 67 lenses on Pentax APSC bodies-focal length setting

I am wondering what focal length should I set when the camera prompts me to enter the focal length number.
For example, for the 105/2.4, should I just enter 105mm or the converted focal length on an APSC? (btw I have no idea what the converted focal length is for the 105mm, is it also 105x1.5 = 157.5mm?)

Or does setting the focal length even matter? Does it change the SR ability and the focus confirmation?


11-26-2013, 02:28 AM   #2
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Join Date: Nov 2006
Location: Brooklyn, NY
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Enter the actual focal length of the lens; that's what the camera does when it reads the focal length from a lens capable of communicating its details.
11-26-2013, 05:22 AM   #3
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Join Date: Nov 2011
Location: Uppsala, Sweden
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Focal length is a lens specification and has nothing to do with mount, sensor or any other external thing. So yes, enter the thing that the the lens specifies.

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