*ist ds & m42 lenses

frugal · 07-27-2008, 07:26 PM

Greetings,
I just purchased a used *ist ds. I'd like to use a couple of my old m42 lenses with it but I'm a bit confused by some of the info on adapters I've found online. What I'd like to do is purchase an adapter for each lens so I'm not constantly threading the things on and off. But, some of the info I've seen seems to suggest that won't work. That the adapter will be left in the camera body each time I remove a lens. Is this true? Is there a practical workaround that will allow me to leave an adapter on each lens?
Thanks,
John

**monochrome** · 07-27-2008, 07:40 PM

The adapter locks into the body just like a K-mount lens. You COULD mount the adapter to the lens, then mount the entire assembly to the body as if it was a K-mount lens, but that is not the Pentax recommendation. Pentax recommends mounting the adapter to the body, then screwing the lens into the adapter.

You should screw the lens into the adapter only finger-tight. There would then typically not be enough friction on the screw threads in the adapter to allow you to unlock the entire assembly and remove it as a unit - the lens would unscrew anyway.

Lastly, you release the spring in the adapter with a thumbnail and unlock the mount lock to remove the adapter. You can't release the spring with a lens mounted.

You may disagree, but for me part of the fun of the screwmount lenses is having to screw them in and out - the old way is strangely satisfying..

wlank · 07-28-2008, 02:18 PM

Hin's Tech Corner

Go here. Hinman has done a good bit of work on adapters for M42 to K mount.

hinman · 07-28-2008, 03:35 PM

Originally posted by wlank

Hin's Tech Corner

Go here. Hinman has done a good bit of work on adapters for M42 to K mount.

Thanks for the kind comments. I post these posts related to M42 adapter in another thread

Originally posted by hinman:

I wrote up bunch of M42 adapters articles in my blog post, I would recommend the Genuine adapter from Pentax as the best option.

Thanks,
Hin

frugal · 07-28-2008, 04:27 PM

Thanks. Will check this info out.

07-27-2008, 07:26 PM	#1
frugal New Member Join Date: Jul 2008 Location: Buffalo, New York Photos: Gallery Posts: 6	ist ds & m42 lenses Greetings, I just purchased a used ist ds. I'd like to use a couple of my old m42 lenses with it but I'm a bit confused by some of the info on adapters I've found online. What I'd like to do is purchase an adapter for each lens so I'm not constantly threading the things on and off. But, some of the info I've seen seems to suggest that won't work. That the adapter will be left in the camera body each time I remove a lens. Is this true? Is there a practical workaround that will allow me to leave an adapter on each lens? Thanks, John

07-28-2008, 03:35 PM	#4
hinman Veteran Member Join Date: Oct 2006 Location: Fremont, CA Photos: Albums Posts: 3,473	Originally posted by wlank Hin's Tech Corner Go here. Hinman has done a good bit of work on adapters for M42 to K mount. Thanks for the kind comments. I post these posts related to M42 adapter in another thread Originally posted by hinman: I wrote up bunch of M42 adapters articles in my blog post, I would recommend the Genuine adapter from Pentax as the best option. Pentax Genuine M42 Adapter Warning on 3rd party M42 adapter Pentax M42 Adapter How to convert M42 to K mount lens Custom Setup for M42 lens Search All of my M42 articles Thanks, Hin

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07-27-2008, 07:40 PM	#2
monochrome Loyal Site Supporter Join Date: Mar 2008 Location: Working From Home Photos: Gallery \| Albums Posts: 26,276	The adapter locks into the body just like a K-mount lens. You COULD mount the adapter to the lens, then mount the entire assembly to the body as if it was a K-mount lens, but that is not the Pentax recommendation. Pentax recommends mounting the adapter to the body, then screwing the lens into the adapter. You should screw the lens into the adapter only finger-tight. There would then typically not be enough friction on the screw threads in the adapter to allow you to unlock the entire assembly and remove it as a unit - the lens would unscrew anyway. Lastly, you release the spring in the adapter with a thumbnail and unlock the mount lock to remove the adapter. You can't release the spring with a lens mounted. You may disagree, but for me part of the fun of the screwmount lenses is having to screw them in and out - the old way is strangely satisfying..

07-28-2008, 02:18 PM	#3
wlank Inactive Account Join Date: Dec 2007 Location: Santa Teresa, New Mexico Photos: Gallery Posts: 1,130	Hin's Tech Corner Go here. Hinman has done a good bit of work on adapters for M42 to K mount.

07-28-2008, 04:27 PM	#5
frugal New Member Join Date: Jul 2008 Location: Buffalo, New York Photos: Gallery Posts: 6 Original Poster	Thanks. Will check this info out.