The sentence is poorly written. The DOF scale is calibrated to 35mm
format, so it will be off a bit, but then it's really just a guideline
anyway, I just use the next smallest marked aperture, it seems to work
OK unless I miss the focus entirely.
John Celio wrote:
http://www.dpreview.com/lensreviews/pentax_50_1p4_p15/
At times it sounds like a sales pitch for the Sigma lens the author
keeps mentioning.
One thing that confuses me was this text about the distance scale:
"A distance scale is provided with ... a depth of field scale marked for
F11, F16 and F22. As a legacy film lens, this is calibrated for the 35mm
full-frame format, and will therefore be somewhat over-optimistic on
APS-C DSLRs."
How can DOF be affected by a cropped sensor? The lens itself hasn't
changed at all, just the image-recording surface area.
John
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