This FotodioX Pro Exakta/Topcon to Pentax K Mount Adapterfrom FotodioX Pro Exakta/Topcon to Pentax K Mount Adapterenables the use of your Exakta/Topcon lenses on Pentax K mount SLR and DSLR cameras. It features a durable brass construction with stainless steel finish and a leaf spring ensures a secure connection between the lens and adapter. Additionally, through the use of a 1.4x multi-coated focus correction lens, this adapter is designed to maintain infinity focus. This correction lens can also be removed to render the adapter as an extension tube for macro shooting.

Exakta/Topcon to K Mount DSLR    1.4x Multi-Coated Focus Correction Lens    Maintains Infinity Focus    Leaf Spring Mount Design    Brass with Stainless Steel Finish

This manual adapter does not maintain automatic lens control between the camera and lens; aperture priority or manual shooting modes should be used, as well as stop-down metering for exposure control.

Related Questions and Answers

Q: 1. Does this Exakta lens adapter work with the Sony a7rii full-frame?

A: It works great on my A7 camera.

Q: 2. What is the function of the movable silver ring on the adapter?

A: This FotodioX Pentax K Lens to Nikon Z-Mount Camera Pro Lens Adapter is designed for lenses that do not have a manual aperture control ring, such as the newer Pentax K AF lenses. This adapter has an aperture control dial built into it which will allow you to open and close the lens manually. The silver ring is for controlling the aperture.

Q: 3. HiDoes this adapter provides infinity focus with the lens RE. Auto-Topcor 1:1.4 f= 58mm ?

A: Yes, the FotodioX Exakta, Auto Topcon Lens to Canon EOS EF Camera Adapter allows infinity focus.

Q: 4. Will this adapter work on the fuji xt-3? I believe I may have purchased the wrong adapter.

A: Yes it should. This allows you to mount Exakta/Topcon mount lens to a Fujifilm X-mount camera. The X-T3 is an X-Mount Camera.

Q: 5. Does this adapter change the focal length of the lens you're using?

A: No lens adapter in the world changes a lens's focal length. If it is a 50mm, it will be a 50mm forever. What does happen when the sensor changes, or as in this case, a very slight extension is made by the adapter's conversion lens, is a change in field of view. In this instance, the adapter is making up for the 0.7mm difference in the two lens mounts. What will happen is a tiny widening of the field of view as compared to what you would see on an regular Exakta/Topcon camera.

Q: 6. Does anybody know if you can use the auto focus 645 pentax lens to be electronically connected via an adapter to a nikon D800 SLR? I will be grateful for any help. Thanks, John Dufton

A: There is no electronic connectivity between Pentax AF lenses and a Nikon digital body with this adapter. Manual focus and manual exposure control. If you chose this route, you're going old-school so be prepared to miss a few shots unless you're stopped down for a wider DOF.

Q: 7. I have a Z7 II camera. Will the flange distance work out correctly if I mount this adapter to a Canon EF-Nikon Z adapter?

A: When using this adapter on a Canon EF-mount to Nikon Z adapter, the flange distance would be the same as one gets when using this adapter directly on a Canon camera. So it will perform equally well on your Nikon Z7 II Mirrorless Camera as it would perform on a Canon EF-Mount camera. However, I would suggest using a different setup. The FotodioX uses an optical element to compensate for the flange distance difference of the Canon EF-Mount. With the Z7 II this optical element is not necessary and a direct adapter such as the KIPON Lens Mount Adapter for Exakta-Mount Lens to Nikon Z-Mount Camera would be a better option, BH #KIEXAKTANIKZ (https://bhpho.to/3uC9oiG). With the Kipon one is not adding an optical element into the mix, and so the lens can perform as it was originally designed to perform.

Q: 8. Does this adapter allow t mount lenses to focus to infinity on Exakta cameras?

A: The General Brand T-Mount SLR Camera Adapter for Exakta & Topcon allows T-mount lenses to focus infinitely on Exakta cameras.

Q: 9. What is the procedure for the removal of the adapter's internal correction lens?

A: A hammer and chisel. You probably know you will lose infinity focus. My guess you will be OK focusing from 8 ft to about 1/2 ft.

Q: 10. Hi, will this fit on a Steinheil Quinar 135/2.8? Thanks!

A: As long as your lens has an Exakta mount, the FotodioX Pro Slim Mount Adapter for Exakta Lens to Canon EOS Camera will fit.