Graydon wrote:
So if I run exiftool on a downloaded copy of your lovely sample JPEG, I get: 8:40 K-7 % exiftool -FocalLength -SRFocalLength 60-250.jpg Focal Length : 250.0 mm SR Focal Length : 196 mm It's quite clear you had the 60-250 all the way out at 250mm; "Focal Length" is 250mm. The "SR Focal Length" isn't; it comes out at 196mm. My immediate question was "that seems odd; does anyone know why it's like that?".
Best guess: Someone at Pentax has worked out that Shake Reduction for this particular lens at 250mm functions best if its algorithms assume a focal length of 196mm rather than the true focal length. This may even be empirically derived - who knows.
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