shake reduction with full frame lenses

Hiroshi · 05-01-2014, 02:39 PM

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.

hcc · 05-01-2014, 02:54 PM

No. With a F50mm, you enter 50 mm.

**RKKS08** · 05-01-2014, 03:02 PM

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.

Adam · 05-01-2014, 03:17 PM

Originally posted by Hiroshi

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.

Adam
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**RobA_Oz** · 05-01-2014, 03:22 PM

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.

MPrince · 05-01-2014, 03:23 PM

Crop factor is a function of sensor size whereas focal length is a physical property of the lens.

**Lowell Goudge** · 05-01-2014, 03:32 PM

Originally posted by RobA_Oz

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.

Hiroshi · 05-01-2014, 03:39 PM

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?

05-01-2014, 02:39 PM	#1
Hiroshi Forum Member Join Date: Nov 2008 Posts: 72	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, 03:39 PM	#8
Hiroshi Forum Member Join Date: Nov 2008 Posts: 72 Original Poster	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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05-01-2014, 02:54 PM	#2
hcc Pentaxian Join Date: Nov 2009 Location: Brisbane, Australia Photos: Gallery \| Albums Posts: 4,005	No. With a F50mm, you enter 50 mm.

05-01-2014, 03:02 PM	#3
RKKS08 Site Supporter Join Date: Mar 2010 Location: Frankfurt am Main Posts: 1,241	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
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,608	Originally posted by Hiroshi 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. Adam PentaxForums.com Webmaster (Site Usage Guide \| Site Help \| My Photography) PentaxForums.com server and development costs are user-supported. You can help cover these costs by donating or purchasing one of our Pentax eBooks. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, KEH, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

05-01-2014, 03:22 PM	#5
RobA_Oz Site Supporter Join Date: Nov 2008 Location: Tasmania, Australia Photos: Gallery Posts: 8,209	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
MPrince Veteran Member Join Date: Sep 2006 Location: WV Posts: 1,495	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
Lowell Goudge Site Supporter Join Date: Jan 2007 Location: Toronto Photos: Gallery \| Albums Posts: 17,891	Originally posted by RobA_Oz 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.