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Pentax M42 to K mount adapter

venkat vn , Sep 17, 2006; 10:29 p.m.

Has anyone used 3rd party adapters recently and recommend a brand? The genuine pentax adapter seems to be out of stock from Pentax in the US, and also at adorama and bhphoto. If the Pentax adapter is available I'd be happy to go with it. Since it is not available, i'd be glad if anyone with experience with 3rd party adapters, could write to this post about any issues you may have faced.

There seem to be several adapters available on ebay, Kood, Marumi, Roxsen and so on. Any specific comments?

Thanks in advance.


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Jerry Thirsty , Sep 17, 2006; 11:28 p.m.

I have gotten at least three "General Brand" from B&H, and they have all been Bowers brand. The thing about them is that they have a little leaf spring that, when you bayonet the lens to the camera, catches on the lens locking mechanism (this is normal, it's supposed to do this). So when you try to remove the lens, it unscrews from the adapter, rather than the adapter coming out with the lens. Then you have to use the included wrench, which disengages the leaf spring while you twist the adapter out of the body.

I have taken to just removing the leaf spring. It means that the lens won't actually lock into the body, so you have to be careful they don't separate inadvertantly, but when you do go to remove the lens, the adapter comes out with it. I've never actually had a lens come off accidentally. The closest call was with a 300/4 Takumar; I had mounted it on a tripod using the lens tripod socket and then got tangled in the camera strap or something, so pulled down on one side of the camera. It turned maybe halfway to coming free.


Wigwam Jones , Sep 18, 2006; 12:16 a.m.

I also bought the Bowers brand from B&H, and I hate it - for the reasons listed. The genuine Pentax brand adapter is so much better made, it is like night and day. With the Bowers, I was able to accidentally over-tighten my M42 lens, and the adapter turned inside the mount and I had one heck of a time getting it out again - of my brand new expensive Pentax *ist DS. I was freaked right out, thought I had ruined the camera. I also promptly lost the little wrench they give you, so that was the end of that experiment.

The genuine Pentax adapter needs no wrench, it comes out quickly and easily. Costs about double what the Bowers does - there is no reason I can think of not to buy the real thing.

Also, there is some fruity looking adapter being sold on eBay that has a 'lip' or 'rim' that protrudes above the inside of the K-mount. The more honest vendors will tell you that your M42 lens won't focus to infinity with this adapter - but most don't bother. Crooks. This adapter serves no purpose and anyone who buys it has been served, IMHO.

Buy the real thing. From Pentax. Works a treat.

It is usually out of stock at Pentax - put your order in, they get them every month or so. They've got the crappiest customer service for accessory sales I've ever seen. It's like 'service with a grudge'.

Used genuine adapters sometimes come up on eBay. The key is, the word Pentax or Asahi (I have one of each) are engraved, not painted on.

Bryce Parker , Sep 18, 2006; 02:04 a.m.

I bought a russian made adapter along with an order for an 85 F/2 russian lens. The Russian made adapter is NOT compatible with Pentax cameras. It's a little hard to describe the problem, but in short the adapter has material on it that prevents it from attaching to a Pentax body, and modification would be impossible without a lathe. The Pentax branded adapter I later bought works fine, though it's a little slow to use. Like has been said, just keep looking 'til you can find the real thing.

Vid Strpic , Sep 18, 2006; 06:12 a.m.

I bought Hama, and had no problems ever since (10+) years.

Jochen Schrey , Sep 18, 2006; 07:27 a.m.

Hama and a FSU product. Both work somehow, but removing them sucks.

Vid Strpic , Sep 18, 2006; 09:48 a.m.

I can most definitely agree to this :((

Mick Evans , Nov 15, 2006; 06:06 p.m.

I have a KOOD M42>K adapter.

The first time I used it the leaf spring got jammed and I had a few tense moments trying to remove it. My experiences pretty much mirror what others have said. When I finally gor the adapter out the leaf spring snapped off and I have had no problems with it since.

I would prefer to have a Geniune PENTAX branded one but where on earth can they be bought from in the UK?

FWIW I have a collection of SMC-M lenses that I now use in preference to my M42s. Perhaps the only M42 lens that I covet now is the 135/2.8 Meyer Orestor in Zebra finish.

Francesco B , Feb 24, 2007; 06:53 a.m.

So...don't you reccomend HAMA adapter ? I've one, but i have the same problems yet described

Drew Kalstrom , Jan 28, 2008; 10:08 a.m.

I just bought a Bower brand k-mount to screw mount adapter and the thing is totally stuck and will absolutely not come out. Is there a trick to getting it off without breaking something?

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