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Pentax PK to Nikon F Mount Adapter

by Raem99 Nov 27, 2016
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Hello! i just wanted to say thanks for making this! I printed it out on my new Monoprice Select Mini V2 and it printed beautifully. The only thing I wonder, have you had any issues with your Pentax lens coming loose in the adapter? I'm using it to attach an SMC Pentax-M 50mm f/1.4 to a Nikon D610 full frame DSLR.

Most Pentax adapters have a small spring that keeps tension on the lens to keep it in place. Since this is 3D printed, there is no such spring, and I found that even in just mounting the adapter (with the lens mounted) the lens came loose in my hand.

By mounting the adapter to my Nikon D610 body first, then attaching the Pentax lens, that worked better and allowed me to take some Macro shots perfectly, but I'm wondering if there isn't a way to keep that Pentax lens from rotating out of the adapter.

Hey! Thanks for printing it! The MP Select Mini V2 is a great machine.

I have not had any issue with it coming loose, but when I am using this I tend to not move around much. To be fair, I am also mounting the adaptor to my Nikon first, then the lens.

Possibly try printing the model at 98%.

Again, thanks for printing it out! I'm glad to have some feedback.

I'll try to get some pictures of the adapter up tomorrow, along with some photos taken USING that adapter. On my Canon 40D , the adapter mount I had allowed the Pentax lens to focus to infinity like normal. Unfortunately on the Nikon, that won't happen without adding a deeper adapter with a glass element to refocus the image.

So now my wonderful, vintage 50mm 1.4 all metal lens is ONLY a semi-macro lens. I will have to experiment with it using my Nikon Macro rings and see what kind of an image I get that direction.