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Forum: Pentax SLR Lens Discussion 09-16-2010, 09:09 PM  
using Canon/Nikon lenses with Pentax body?
Posted By Big Screen
Replies: 27
Views: 35,555
No , I don't think these are really that special of or valuable lens.
You will only want to REPLACE the Nikon mount ring with a Pentax if you have a special
high quality fast lens.
You are not going to have a secure or safe adaption by just grinding off a couple of areas
or knobs.
Again as I stated in my previous post the Nikon & Pentax are opposite thread patterns from each other and used enough by pressing and turning you WILL finally damage your Pentax.
It is only the tip of the back of the fins barley holding that are making these guys think they have adapted the Nikon lens.
Get a Pentax mount and have someone that is experienced, mill the lens (kind of like a shallow routing) and thread for the new screw wholes. Ofcurse it should be a great lens or it's NOT worth it.

Best of all save some money up and watch . You will find a good Pentax lens which will work the best.
Forum: Pentax SLR Lens Discussion 07-26-2010, 10:19 PM  
using Canon/Nikon lenses with Pentax body?
Posted By Big Screen
Replies: 27
Views: 35,555
Hey RioRico,
I nor any tech know would waste any time trying to carve on or just change a ring on the Canon
ring . The "registration" on the Canon is not close to that of the Pentax like the Nikon is.
You can buy an adapter even on ebay (cheap) with a corrective lens and a safe mount if a Canon lens is what you desire to use on the Pentax..
But remember the Nkon lens that you think s fittng is not really . The Pentax lens (bayonet ) screws on clockwise but the Nikon lens screws on it's body counter-clockwise.
It is a coincidence that the rear end of the threads on the mounts are catching and bending some in order to catch enough to appear to hold. The registration is almost the same so most of the shots will focus OK. Depends on the lens. If you need a Pentax lens mounting ring cheap to mill on to the Nikon you can sometimes buy a cheap undesirable Pentax lens for less than a mount ring would cost. Then take the mounting ring off of the lens and install it on the OLD Nikon lens you want to use.
But as I mentioned in the earlier thread , the ring you install on to the Nikon lens will need a thin spacer between it and the new ring to match the Pentax "registration" distance. This modification gives you a secure and safer attachment for old Nikon lens to Pentax body .

Be careful with the experimental fitting and don't screw up your bayo mount on your Pentax body like others have done.
Forum: Pentax SLR Lens Discussion 07-14-2010, 06:05 PM  
using Canon/Nikon lenses with Pentax body?
Posted By Big Screen
Replies: 27
Views: 35,555
WARNING ! To All you guys that are screwing Nikon lens on Pentax body.

You are gravely mistaken to think the old Nikons "fit" on the Pentax SLR bodies.

It's just barely staying together(not "fitting") with lots of potential damage to your camera or possibly the lens. You see ...the Nikon lens screws on the it's camera in the opposite direction from the way a Pentax lens screws on to a Pentax body.
The parts of the Nikon lens that are holding is the back end of the treads to the THIN tail end of the treads on the Pentax body. If you bump or in some cases snug it a little more to tighten it up, just a little , you can damage or warp the thread fins & bayonet mount on your camera . You will then not be able to get ANY Pentax lenses back on your new Digi Pentax SLR. In some cases the aluminum bayonet threads just break .Continuous use will definitely start to fatigue and crack your bayonet threads the more you try to match the Nikon to the Pentax mount.
Many people have already done it. It makes the repair shops happy . They do need the extra income in this destroyed economy though.

If you feel compelled to attach the Nikon lens to the Pentax buy the adapter off the .NET and deal with the extra glass to compensate for infinity. Or have the bayonet ring on the lens replaced with a Pentax. This will require a tech that knows how to drill the precise holes and thread for new screws. Oh yes, you wll need a very thin spacer between the ring and lens to match the "lens registration" distance. This is coincidentally about the thickness of 35mm film.

Be careful my fellow Pentaxers
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