4
\$\begingroup\$

I wonder whether it would be possible to mount Pentax lenses on a Sony NEX, using an adapter. Are such adapters already available? Would it be possible to have automatic focus?

Improve this question
\$\endgroup\$
3

5 Answers 5

Reset to default
3
\$\begingroup\$

Yes, they're available, from several sources. Two notable ones are:

There are also versions available on eBay from various sellers, but I have no idea about reliability or quality of those. Rayqual and Cosina are both long-time manufacturers with pretty good reputations.

Autofocus will not be possible. AF systems aren't necessarily compatible to begin with, and the connection information isn't available to third parties. The best situation for most adapters is focus confirmation.

Improve this answer
\$\endgroup\$
1
\$\begingroup\$

I bought a cheap one from ebay and never had any issues with it.

Improve this answer
\$\endgroup\$
3
  • 1
    \$\begingroup\$ Which brand/model did you get? Are there any limitations? \$\endgroup\$
    – Rowland Shaw
    Commented Jul 21, 2011 at 18:12
  • \$\begingroup\$ No brand/model, It's white labeled! (similar to this one) \$\endgroup\$
    – Edson Medina
    Commented Jul 31, 2011 at 17:44
  • 1
    \$\begingroup\$ The only limitation is the loss of auto-focus (as expected). Everything else works perfectly. Tried it with several lenses, all worked. \$\endgroup\$
    – Edson Medina
    Commented Jul 31, 2011 at 17:46
1
\$\begingroup\$

I have K&F Concept Lens Mount Adapter: http://www.amazon.com/Concept-Adapter-Pentax-E-Mount-NEX-VG10/dp/B00LECYTL4?ie=UTF8&psc=1&redirect=true&ref_=oh_aui_detailpage_o02_s01

enter image description here

It works perfectly and I like that the one I have for Nikon F Mount is from a different company (Kiwifoto) so its easy for me to identify which is which. It is all manual but then my Pentax lenses are all old manual ones anyways. I haven't seen any Pentax K adapters with electronics in them.

Improve this answer
\$\endgroup\$
0
\$\begingroup\$

Yes, it is possible to mount and use Pentax K objectives with Sony E mount via adapter with following limitations:

  • no autofocus and any function requiring electricity are usable
  • no aperture coupling is possible, the aperture won't be opened for framing automatically and closed for exposure
  • objectives without aperture ring will be have aperture closed unless an adapter features an aperture ring itself.
Improve this answer
\$\endgroup\$
1
  • \$\begingroup\$ is it possible to use the Pentax- A SMC Zoom 1:4 28 – 135 mm on sony a6300 with the adapter \$\endgroup\$
    – Wes2018
    Commented Apr 26, 2018 at 20:07
0
\$\begingroup\$

There are two kinds of mechanical adapters for PK. One that has an additional slider to operate the aperture on a lens without an aperture ring (eg the "Pentax- A SMC Zoom 1:4 28 – 135 mm" that was asked about in a comment), albeit in uncalibrated fashion.

The other style does not have this feature, making lenses with no aperture ring only usable wide open but eliminating a potential source of operator error (slider set the wrong way leads to aperture ring operation not having the expected effect).

The second cheapest choice of adapters (eg the K&F mentioned in another answer) is usually fine. There are even cheaper options, these sometimes will exhibit problems like too-loose fit (especially with third party lenses) or light leaks.

Improve this answer
\$\endgroup\$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.