Pentax K-mount lenses on Canon XSi body?

Does anyone know of an adapter that will allow a Pentax K-mount lens to be used on a Canon EOS body (specifically an XSi/XS/XTi body) without damaging the body?

I have two K-mount (bayonet mount) Pentax lenses from my film camera days that I'd really love to adapt for use with my Canon XSi if that's possible:

• SMC Pentax 35mm f/2.8
• Vivitar Series 1 90mm f/2.5 Macro (a jewel)

I ran across this link pointing to some information on the subject:
http://forums.dpreview.com/forums/read.asp?forum=1031&message=27498142

I'd appreciate any additional info anyone may have. Thanks in advance.

Hi there,

I've recently bought a Kmount to EOS Adaptor. It is one without the autofocus confirmation chip in it. I've had no problem using it apart from focus being a little difficult to achieve, especially when its a little darker and your stopped down a few apperture stops.

I've so far used a Pentax M 50mm f1.7, M28mm f2.8 and a M80-200 f4.5 on my 20D. I haven't got any photos to post as I've only tried it around home. But I'm quite suprised at how sharp all three of these lenses are on the 20D. I'm kind of envious of Pentax users with their in body image stabalization.

Not sure how the autofocus confirm ones are. I briefly tried one when I was getting the one I got it seem to work fine though. But didn't want to spend the extra $$ as I wasn't sure how much I would use the lenses in the end.

rtpnc said:

Does anyone know of an adapter that will allow a Pentax K-mount lens
to be used on a Canon EOS body (specifically an XSi/XS/XTi body)
without damaging the body?

Click to expand...

the protruding element of K-mount is only dangerous on FF as their mirror is
so much larger; I'm using Takumar 15/3.5, and Porst 55/1.2 with not a single
problem of this kind on both xxxD and xxD bodies;

also... many sources are offering a confirm chip separately, at not exorbitant prices too, it can be then DYI glued into place rather easily; recently some new versions were developed - offering possibility to code min. and max. F-stops of any lens on which such adapter might be used - so it is then recorded in EXIF if body's FW will accept this,

jpr2
--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
wildlife, macro, B&W, and 'interactive' street:
http://www.flickriver.com/photos/qmusaget/sets/72157600341377106/
street candids (non-interactive):
http://www.flickriver.com/photos/qmusaget/sets/72157609618638319/
Comments and critique are always welcome!
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Thanks a lot for the information. Just a few questions:

• Could you indicate where you bought your Kmount to EOS Adaptor?
• Do you have a link to info on adaptors with an autofocus confirmation chip?
• Is your adaptor easy to install and remove from your 20D?

jpr2 said:

the protruding element of K-mount is only dangerous on FF as their
mirror is
so much larger; I'm using Takumar 15/3.5, and Porst 55/1.2 with not a
single
problem of this kind on both xxxD and xxD bodies;

Click to expand...

Could I ask where you acquired your adaptor?

It's also good to know that xxxD and xxD bodies are not damaged -- that is extremely important.

Thanks.

rtpnc said:

Could I ask where you acquired your adaptor?

Click to expand...

now this is a very good question - up to date I've tried three, and neither was 100% satisfactory (all chipless, this might simplify matters a lot when chip is acquired separately):

• Hartblei - built like a tank, rugged, however, rather difficult to use, and above all no infinity focus on a single lens I've tried it on;
• Chinese of the so called "locking pin" variety - easy to mount on a lens (all these adapters need to be mounted on lens first, and NOT on a body), infinity focus OK; made of a soft Al+Mg alloy, but it's apparent lightness of a built might be deceiving into a false impression of non-solidity; CON: locking pin design is a clear pita;
• Chinese, with a locking lever; infinity focus OK, again Al+Mg alloy; locking lever of very poor durability = broken after several uses only - to be avoided.

so... in fact I'd appreciate a source of a really good quality, infinity focus preserving, and NOT of locking pin type, adapter myself,

jpr2
--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
wildlife, macro, B&W, and 'interactive' street:
http://www.flickriver.com/photos/qmusaget/sets/72157600341377106/
street candids (non-interactive):
http://www.flickriver.com/photos/qmusaget/sets/72157609618638319/
Comments and critique are always welcome!
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

I'm looking for one as well since I just jumped from Pentax to a 40D. Here are two AF Confirm adapters that I'm considering on eBay, note that one does mention the EXIF information on the chip (and the price difference):

-- http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MEWAX:IT&item=190287458690

http://cgi.ebay.com/Pentax-PK-Lens-4-Canon-EOS-350D-40D-450D-5D-AF-adapter_W0QQitemZ370171313044QQcmdZViewItemQQptZLens_Accessories?hash=item370171313044&_trksid=p3286.c0.m14&_trkparms=72%3A1205%7C66%3A2%7C65%3A12%7C39%3A1%7C240%3A1318%7C301%3A0%7C293%3A1%7C294%3A50

jordan justice said:

I'm looking for one as well since I just jumped from Pentax to a 40D.
Here are two AF Confirm adapters that I'm considering on eBay, note
that one does mention the EXIF information on the chip (and the price
difference):

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MEWAX:IT&item=190287458690

http://cgi.ebay.com/Pentax-PK-Lens-4-Canon-EOS-350D-40D-450D-5D-AF-adapter_W0QQitemZ370171313044QQcmdZViewItemQQptZLens_Accessories?hash=item370171313044&_trksid=p3286.c0.m14&_trkparms=72%3A1205%7C66%3A2%7C65%3A12%7C39%3A1%7C240%3A1318%7C301%3A0%7C293%3A1%7C294%3A50

Click to expand...

Jordan,

images are not good enough to glean much, perhaps you should contact both sellers for more details. The first one looks like equipped with a locking lever, while the second one is more likely to be of a locking pin type (but this is just guessing). The price diff. might have more to do with machining accuracy and material of the respective adapters (brass ones are usually more expensive than those from aluminum), than their confirm. chips, but again not enough info provided,

if you learn more, pls. post here,
good luck,
jpr2
--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
wildlife, macro, B&W, and 'interactive' street:
http://www.flickriver.com/photos/qmusaget/sets/72157600341377106/
street candids (non-interactive):
http://www.flickriver.com/photos/qmusaget/sets/72157609618638319/
Comments and critique are always welcome!
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

rtpnc said:

Thanks a lot for the information. Just a few questions:

• Could you indicate where you bought your Kmount to EOS Adaptor?
• Do you have a link to info on adaptors with an autofocus

confirmation chip?

• Is your adaptor easy to install and remove from your 20D?

Click to expand...

I got mine in New Zealand from A chap that sells stuff on our NZ version of ebay. So I'm not sure this will help you out . Just had a look at his listings, looks like he hasn't got any of the non auto focus ones at the moment heres a link to the auto one.

http://www.trademe.co.nz/Electronics-photography/Camera-accessories/Lenses/Other/auction-207261937.htm

Its real easy to connect to the lens and the then the lens just mounts as a normal EOS lens. The adaptor's a little tricky to get off the lens but nothing to hard you just have to hold a spring like bit in to twist it past the lugs on the lens. Fingernails help.