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05-01-2014, 02:39 PM   #1
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shake reduction with full frame lenses

My question is: Shake reduction needs to know the focal length of the lens. If you are using a full frame pentax "F" series lens or similar, do you need to manually input the focal length to account for the crop factor? I'm sorry if this has been answered before, I did a search but did not find anything.

05-01-2014, 02:54 PM   #2
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No. With a F50mm, you enter 50 mm.
05-01-2014, 03:02 PM   #3
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Shake reduction compensates movement of the projected picture which is caused by shift/tilt/rotate movements of camera + lens.

Only the focal length of the lens decides the relation between camera movement and movement of the projected picture on the sensor.
How much area the projection can/could cover is irrelevant.
05-01-2014, 03:17 PM   #4
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QuoteOriginally posted by Hiroshi Quote
My question is: Shake reduction needs to know the focal length of the lens. If you are using a full frame pentax "F" series lens or similar, do you need to manually input the focal length to account for the crop factor? I'm sorry if this has been answered before, I did a search but did not find anything.
Focal length is focal length, regardless of the format the lens was originally meant for. Just enter whatever it says on the lens, always, unless you're using a teleconverter.


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05-01-2014, 03:22 PM   #5
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F lenses should automatically enter the focal length, as should A lenses (which are the non-AF predecessors to the Fs). You'll need to manually enter the FL for earlier Pentax and some third-party lenses.
05-01-2014, 03:23 PM   #6
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Crop factor is a function of sensor size whereas focal length is a physical property of the lens.
05-01-2014, 03:32 PM   #7
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QuoteOriginally posted by RobA_Oz Quote
F lenses should automatically enter the focal length, as should A lenses (which are the non-AF predecessors to the Fs). You'll need to manually enter the FL for earlier Pentax and some third-party lenses.
No a lenses don't give any feedback if focal length.

Not sure about F lenses. FA for sue do.
05-01-2014, 03:39 PM   #8
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shake reduction

Thanks to all of you for the answers. Makes sense that the motion correction is the same regardless of whether the image is cropped or not. One last question, when I use the "Check the shutter count" tab on this website and look at the exif data, it says "ShakeReduction On (15) ". What is the (15) telling you?

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