"sensor size" EXIF vs published value for photogrammetry

danielmerrick · 03-26-2017, 04:18 PM

For my K-50, the published sensor size is 23.7mm x 15.7mm. When I look at the EXIF file, it says the sensor size is 24.122mm x 15.976mm. The only guess I have is that the EXIF size is the actual size but the camera crops it down a little bit.

Does anybody know for sure what the difference is?

Thanks,
Dan

**jbinpg** · 03-26-2017, 04:29 PM

This is par for the course. Camera manufacturers often leave a strip of pixels along one side for calibration purposes and other internal uses.

MartinsB · 03-27-2017, 12:57 AM

IBIS needs some space too.

Simen1 · 03-27-2017, 01:02 PM

Originally posted by MartinsB

IBIS needs some space too.

But IBIS is not a part of this difference. IBIS moves the sensor around, it doesn't change its size or consume some of the pixel rows or columns. To be exact, In Pentax APS-C and FF systems the sensor may move up to 1,5 mm, left, right, up or down, from the center position, and/or rotate within the same frames.

03-26-2017, 04:18 PM	#1
danielmerrick New Member Join Date: Mar 2017 Posts: 1	"sensor size" EXIF vs published value for photogrammetry For my K-50, the published sensor size is 23.7mm x 15.7mm. When I look at the EXIF file, it says the sensor size is 24.122mm x 15.976mm. The only guess I have is that the EXIF size is the actual size but the camera crops it down a little bit. Does anybody know for sure what the difference is? Thanks, Dan

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03-26-2017, 04:29 PM	#2
jbinpg Site Supporter Join Date: Mar 2008 Location: Prince George, BC Photos: Gallery \| Albums Posts: 3,546	This is par for the course. Camera manufacturers often leave a strip of pixels along one side for calibration purposes and other internal uses.

03-27-2017, 12:57 AM	#3
MartinsB Forum Member Join Date: Jun 2014 Posts: 67	IBIS needs some space too.

03-27-2017, 01:02 PM	#4
Simen1 Veteran Member Join Date: Jul 2009 Location: Tromsø, Norway Photos: Albums Posts: 1,031	Originally posted by MartinsB IBIS needs some space too. But IBIS is not a part of this difference. IBIS moves the sensor around, it doesn't change its size or consume some of the pixel rows or columns. To be exact, In Pentax APS-C and FF systems the sensor may move up to 1,5 mm, left, right, up or down, from the center position, and/or rotate within the same frames.