Sony A7Rii and Pentax 645 lenses

[PhilC]

Has anyone any experience with using Pentax 645 lenses on a Sony A7 and if so, which adapter works and what results/limitations did you find?

 

Having my A7Rii waiting for the Batis 25mm to come into stock, I am wondering how I can use my 645 lenses

 

Appreciate all input

 

Thanks

 

Phil

 

 

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[Singingsnapper]

I couldn't find a 645 to E mount.  I have Nikon F mount to E mount adaptor so bought a photodiox 645 to F Mount adaptor and stacked them....seems to work ok, will meter and will focus to infinity.  Haven't really tested it in anger yet...

[PhilC]

Did you see this one - https://www.fotodioxpro.com/lens-mount-adapter-pentax-645-p645-mount-lenses-sony-emount-mirrorless-camera.html

 

Anyone tried it?

 

 

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[LeButler]

There's probably not a large enough market for it, but a speedbooster version so all of the lens gets used could provide amazing quality with no compromise on aperture (MF lenses are never wider than f2.8, most are over f4).

[Singingsnapper]

Did you see this one - https://www.fotodioxpro.com/lens-mount-adapter-pentax-645-p645-mount-lenses-sony-emount-mirrorless-camera.html

 

Anyone tried it?

 

 

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I have seen reference it that, but can't get it in the UK.  Would prefer a direct adaptor, but he combination of Fotga and photodiode is working ok so far,  

[Singingsnapper]

There's probably not a large enough market for it, but a speedbooster version so all of the lens gets used could provide amazing quality with no compromise on aperture (MF lenses are never wider than f2.8, most are over f4).

The usefulness wil depend on the use.  There will be a 'crop factor' involved, but don't know definitively what.  The Pentax digital sensors are 44 x 33 in comparison to the 36 x 24 of the Sony.  I wouldn't be able to use 645 lenses on it t the exclusion of the FE lenses I have, but the 120mm f/4 macro I have should be crazy sharp on the mkII.  Manual focussing isn't an issue for me in any case...

[PhilC]

I am thinking in the context of being my backup camera. So when travelling I will carry the Sony and Batis 25mm as backup for the 645Z (and use the Sony for the times I want a light carry round camera). Now if i have a problem with the 645Z, it would be ideal to supplement the wide angle Batis with the 645Z lenses, so an adapter is desired :-)

 

 

 

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[Singingsnapper]

If you have the 28 - 45, I'm not sure I'd want to put that on the front of the Sony!  That thing weighs a ton!  Mine fell out of a bag and is in need of repair.  Dreading the bill for it!

[PhilC]

Yep I have it and wouldn't put that on the Sony, hence the Batis :-). But putting on the 55, 75 and even the 150 would be useful

 

 

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