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Flying Fossil · Oct 13, 2011, 10:49 AM

Hello folks,
I am looking at the Pentax K5 which has some very nice features and build quality.
Does anyone here know if it could be converted to use my Sony A mount lenses?

Thanks

TCav · Oct 13, 2011, 3:46 PM

I don't think you're going to have much luck with that. Sony's A-Mount has a mount to focal plane distance of 44.5 mm, while Pantax' K-Mount's is 45.46 mm. Even if you could mount your A-Mount lenses on the K5, they wouldn't focus at infinity. On top of that, the electrical contacts and AF motor drive screw are in different locations, so they'd be manual focus and manual exposure, and most (if not all) A-Mount lenses don't have aperture rings.

Bob Nichol · Oct 13, 2011, 4:02 PM

Buying into an interchangeable lens camera system is a lot like getting divorced: It's going to cost you a lot of pain and money to dump one system and start another. Other than 4/3 and micro 4/3, current camera systems are brand specific and not interchangeable.

Oct 13, 2011, 10:49 AM	#1
Flying Fossil Senior Member Join Date: Aug 2006 Location: Irvine, CA Posts: 750	Pentax K5 conv. Hello folks, I am looking at the Pentax K5 which has some very nice features and build quality. Does anyone here know if it could be converted to use my Sony A mount lenses? Thanks __________________ A77, 28-75mm f/2.8, 16-50mm f2.8, 18-250mm f3.5, 70-300mm f4.5G SSM

Oct 13, 2011, 3:46 PM	#2
TCav Senior Member Join Date: Sep 2005 Location: Washington, DC, Metro Area, Maryland Posts: 13,750	I don't think you're going to have much luck with that. Sony's A-Mount has a mount to focal plane distance of 44.5 mm, while Pantax' K-Mount's is 45.46 mm. Even if you could mount your A-Mount lenses on the K5, they wouldn't focus at infinity. On top of that, the electrical contacts and AF motor drive screw are in different locations, so they'd be manual focus and manual exposure, and most (if not all) A-Mount lenses don't have aperture rings. __________________ The lens is the thing. 'Full Frame' is the new 'Medium Format'. "One good test is worth a thousand expert opinions." - Tex Johnston, Boeing 707 test pilot.

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Oct 13, 2011, 4:02 PM	#3
Bob Nichol Senior Member Join Date: Apr 2003 Location: Eastern Ontario Canada Posts: 823	Buying into an interchangeable lens camera system is a lot like getting divorced: It's going to cost you a lot of pain and money to dump one system and start another. Other than 4/3 and micro 4/3, current camera systems are brand specific and not interchangeable.