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Photo Forum / Digital Photography / DSLR Cameras / February 2006Pentax K to Canon EOS mount adaptor?
Is there any such thing on this planet? And, is there any possible mechanical conflict(s) when my KAF-mount lenses are mounted on the EOS body, with the mount adaptor (if any) used? TIA for any help and info! Best Regards, RiceHigh http://www.geocities.com/ricehigh Why would you want to do this? The lens, if mounted on a EOS body, would only work with the camera in Manual mode: no metering, no auto-focus, no decent auto-flash operation. If you have K-mount lenses, find a body that (i.e., Pentax) will work with that type of lens attached. = = = > Is there any such thing on this planet? And, is there any possible > mechanical conflict(s) when my KAF-mount lenses are mounted on the EOS [quoted text clipped - 5 lines] > RiceHigh > http://www.geocities.com/ricehigh >Why would you want to do this? > >The lens, if mounted on a EOS body, would only work with the camera in >Manual mode: no metering, no auto-focus, no decent auto-flash >operation. All the EOS bodies that I've used (including my current one, the 5D, on which I use some old manual focus lenses) will perform metering and automatic exposure (in Av mode) without an EF lens being attached. >Is there any such thing on this planet? And, is there any possible >mechanical conflict(s) when my KAF-mount lenses are mounted on the EOS >body, with the mount adaptor (if any) used? There are m42 (screw mount) adapters for EOS bodies, but not K-to-EOS due to image-plane-to-lens-flange distance issues. This is about the closest I've seen: http://www.cottysnaps.com/snaps/mods/eoskmount.html  SignatureMark Roberts Photography and writing www.robertstech.com >>Is there any such thing on this planet? And, is there any possible >>mechanical conflict(s) when my KAF-mount lenses are mounted on the EOS >>body, with the mount adaptor (if any) used? > >There are m42 (screw mount) adapters for EOS bodies, but not K-to-EOS >due to image-plane-to-lens-flange distance issues. The reason why you cannot use Pentax K lenses on Canon EOS bodies has nothing to do with "image-plane-to-lens-flange distance issues". There are no such issues because the image-plane-to-lens-flange distance is **identical** for M42 and Pentax K mounts. The reason why you cannot use Pentax K lenses on Canon EOS bodies is that the aperture stop-down mechanism on the K lens fouls the camera. It is perfectly possible to adapt the SMC Pentax M 28mm shift lens to an EOS mount, because it has no aperture stop-down mechanism, being a pre-set lens. "Tony Polson" <tp@nospam.co.uk> wrote: >>>Is there any such thing on this planet? And, is there any possible >>>mechanical conflict(s) when my KAF-mount lenses are mounted on the EOS >>>body, with the mount adaptor (if any) used? >> >>There are m42 (screw mount) adapters for EOS bodies, but not K-to-EOS >>due to image-plane-to-lens-flange distance issues. > The reason why you cannot use Pentax K lenses on Canon EOS bodies is > that the aperture stop-down mechanism on the K lens fouls the camera. > > It is perfectly possible to adapt the SMC Pentax M 28mm shift lens to > an EOS mount, because it has no aperture stop-down mechanism, being a > pre-set lens. This is correct. Also the Pentax 100mm refelctive has no aperture stop-down mechanism. I own this lens, and want to use it with my Canon 10D... So the question still is: Does anyone know where/how to get a Pentax (K-mount) to Canon EOS adapter? SignatureEspen Mills www.espenmills.com >> The reason why you cannot use Pentax K lenses on Canon EOS bodies is >> that the aperture stop-down mechanism on the K lens fouls the camera. [quoted text clipped - 7 lines] >question still is: Does anyone know where/how to get a Pentax (K-mount) to >Canon EOS adapter? I don't know of any that are manufactured and sold commercially. I know of a company in England that specialises in making adapters for photo gear. There must be similar companies around the world. "Tony Polson" <tp@nospam.co.uk> wrote: >>This is correct. Also the Pentax 100mm refelctive has no aperture >>stop-down >>mechanism. I own this lens, and want to use it with my Canon 10D... So the >>question still is: Does anyone know where/how to get a Pentax (K-mount) to >>Canon EOS adapter? > I don't know of any that are manufactured and sold commercially. > > I know of a company in England that specialises in making adapters for > photo gear. There must be similar companies around the world. I live in Norway, I doubt there is a big enough market for that kind of things here... Do you have a name or a website-adress for this company in the UK? SignatureEspen Mills www.espenmills.com >"Tony Polson" <tp@nospam.co.uk> wrote: >>> [quoted text clipped - 12 lines] >things here... Do you have a name or a website-adress for this company in >the UK? Sure. Here are the details: http://www.srbfilm.co.uk/adaptors.htm enquiries@srbfilm.co.uk SRB Film Service 286 Leagrave Road LUTON Bedfordshire LU3 1RB England Tel: 00 44 (0)1582 572471 Fax: 00 44 (0)1582 572535 >>> The reason why you cannot use Pentax K lenses on Canon EOS bodies is >>> that the aperture stop-down mechanism on the K lens fouls the camera. [quoted text clipped - 13 lines] > I know of a company in England that specialises in making adapters for > photo gear. There must be similar companies around the world. If the lens to film plane distances are the same, you will still have a problem, because the adapter is going to require some space, and this will make the adapted lens system too far from the film plane, so a corrective lens in the adapter will still be required..... >If the lens to film plane distances are the same, you will still have a >problem, because the adapter is going to require some space, and this will >make the adapted lens system too far from the film plane, so a corrective >lens in the adapter will still be required..... William, I think you are getting confused. The Pentax K bayonet and M42 screw mounts share the same lens flange to film plane dimension. That dimension is greater than the lens flange to film plane dimension of the Canon EF mount, so there is plenty of room for an adapter. Tony >>If the lens to film plane distances are the same, you will still have a >>problem, because the adapter is going to require some space, and this will [quoted text clipped - 9 lines] > > Tony Ah yes.....You are right. I thought you were going from K to M42, and not from EF to K or M42. >>>Is there any such thing on this planet? And, is there any possible >>>mechanical conflict(s) when my KAF-mount lenses are mounted on the EOS [quoted text clipped - 7 lines] >There are no such issues because the image-plane-to-lens-flange >distance is **identical** for M42 and Pentax K mounts. True, but the K-mount won't fit inside the EOS mount so it would require an adapter that spaced the K lens farther away from the body thus increasing the image-plane-to-lens-flange distance. SignatureMark Roberts Photography and writing www.robertstech.com >>>>Is there any such thing on this planet? And, is there any possible >>>>mechanical conflict(s) when my KAF-mount lenses are mounted on the EOS [quoted text clipped - 11 lines] >an adapter that spaced the K lens farther away from the body thus >increasing the image-plane-to-lens-flange distance. Wrong again. You snipped out the part of my reply that explained why. Mark, Isn't this what Cotty is doing? http://www.mail-archive.com/pentax-discuss@pdml.net/ http://www.pdml.net Collin >Mark, > >Isn't this what Cotty is doing? >http://www.mail-archive.com/pentax-discuss@pdml.net/ >http://www.pdml.net Who or what is "Cotty"? A member of PDML who has Canon but is known for making some great "frankenstein" outfits. A rather innovative Brit he is. Collin >>Isn't this what Cotty is doing? >>http://www.mail-archive.com/pentax-discuss@pdml.net/ >>http://www.pdml.net > >Who or what is "Cotty"? http://www.cottysnaps.com/snaps/mods/eoskmount.html SignatureMark Roberts Photography and writing www.robertstech.com >>>Isn't this what Cotty is doing? >>>http://www.mail-archive.com/pentax-discuss@pdml.net/ [quoted text clipped - 3 lines] > >http://www.cottysnaps.com/snaps/mods/eoskmount.html Now that's *impressive*. Unfortunately, I sold most of my Pentax lenses so I won't be fitting them to my Canon EOS 5D. Someone has just given me the link below, which makes a true compatible K to EOS adaptor possible! http://blog.saers.com/archives/2005/11/16/pentax-k-to-canon-eos-lens-adapter/ How shall we refer to such a wonderful advantage? "Optical Improvement for your Canon" ? : ) Where's ol' AnnikaXX when we need him? We can now "fix" his cameras. (But unfortunately not his photographic skills.) Collin >Someone has just given me the link below, which makes a true compatible >K to EOS adaptor possible! > >http://blog.saers.com/archives/2005/11/16/pentax-k-to-canon-eos-lens-adapter/ Well I'll be damned - it looks like it can be done: http://cgi.ebay.com/Adapter-to-mount-PENTAX-K-lenses-on-CANON-EOS_W0QQitemZ75648 45509QQcategoryZ30059QQssPageNameZWDVWQQrdZ1QQcmdZViewItem Looks like there's enought difference between Image-Plane to Lens-Flange Distance between the two mounts for infinity focus to be maintained, too: Image-Plane to Lens-Flange Dist. ------------------------------- Canon (FD) 42.1mm Minolta 43.5mm Canon EOS 44.0mm Pentax K 45.5mm Contax (old) 45.5mm Nikon 46.5mm Contax N 48.0mm SignatureMark Roberts Photography and writing www.robertstech.com Imagine, a fine EOS 1v with a 31/1.8 Limited. but complete uncoupled. Seems a waste except perhaps for tripod use. Collin >>Someone has just given me the link below, which makes a true compatible >>K to EOS adaptor possible! >> >>http://blog.saers.com/archives/2005/11/16/pentax-k-to-canon-eos-lens-adapter/ > >Well I'll be damned - it looks like it can be done: Your apology is accepted. How polite. But then we can always look forward to politeness from Pentax users. It's those dang Leica people we need to watch out for. Collin >How polite. >But then we can always look forward to politeness from Pentax users. >It's those dang Leica people we need to watch out for. I think you mean Leica collectors! Mojtaba >Collin RiceHigh a écrit : > Is there any such thing on this planet? And, is there any possible > mechanical conflict(s) when my KAF-mount lenses are mounted on the EOS [quoted text clipped - 5 lines] > RiceHigh > http://www.geocities.com/ricehigh Why not an excellent Pentax DSLR ? They have a TRUE KAF-mount 8=)) > RiceHigh a écrit : >> Is there any such thing on this planet? And, is there any possible [quoted text clipped - 9 lines] > Why not an excellent Pentax DSLR ? > They have a TRUE KAF-mount<< Actually, they *don't* have a 'true KAF mount - it's a crippled version that relies on in-camera aperture setting That apart, there is no decent Pentax dslr to buy - the *ist D was the only decent one they made, subsequent models have merely been downgrades of the original. To Pentax, a 'new' model is an old model that has been painted silver.. It is a true KAF mount. But it doesn't accomodate pre-"A" lenses without either a push of a button or stop-down metering. -- that's only for manual focus lenses. Works perfectly with all Pentax AF lenses. I use my K30/2.8 all the time as well as an old Tokina RMC 17/3.5. Both are without "A" but work well. Collin >Actually, they *don't* have a 'true KAF mount - it's a crippled version that >relies on in-camera aperture setting The later software for the *ist D gave it "Hyper Manual" mode, which is actually a one-shot aperture priority AE mode. You make a custom setting allowing lenses to be used other than at the "A" position of the aperture ring, and that allows all Pentax M42 and K (pre-KA) lenses to be used in Hyper Manual. You set the exposure mode to "M" and press the green button which stops down the K lens to the chosen aperture (M42 lenses will already be stopped down) and the exposure meter chooses a shutter speed. All subsequent shots will be made at that shutter speed. It sounds far more complicated than it is. In fact, it is extremely simple and it works well. >That apart, there is no decent Pentax dslr to buy - the *ist D was the only >decent one they made, subsequent models have merely been downgrades of the >original. To Pentax, a 'new' model is an old model that has been painted >silver.. Each subsequent model has improved on the *ist D in terms of image quality. The best image quality comes from the *ist DL, which might appear to you to be a downgrade, but in fact produces excellent image quality - it is on a par with the Nikon D50, slightly better than the D70 and significantly superior to the Konica Minolta 7D and 5D, all of which use nominally the same 6.1 MP Sony sensor. It's so easy to take a swipe at Pentax because the company is not in the same league as Canon and Nikon. But by being conservative, Pentax has made excellent profits from digital cameras, both P&S and DSLR. There is a published strategic plan for introduction of new DA lenses - DA indicates they are optimised for small sensors. All introductions so far have been on target and the lenses have obtained very good reviews. Pentax's share price is riding high. A Japanese investment house has taken a significant stake in the company. This was not bought at a low price in the hope of a recovery - the price paid was high and Pentax has nothing to recover from. Pentax is doing very, very well. Pentax has recently signed a collaboration agreement with Samsung. Samsung will manufacture sensors and Pentax will contribute DSLR know-how to a joint range of Pentax-made DSLRs. Samsung has already announced its first DSLR, a re-badged *ist DL. The successor to the *ist D, with a significant increase in pixel count over the *ist D, DS, and DL is expected to be announced at PMA. I think Pentax has proved that it is possible to make a success of digital in a way that no other company can. The contrast with the Konica Minolta disaster could not be more stark. >>Actually, they *don't* have a 'true KAF mount - it's a crippled version that >>relies on in-camera aperture setting [quoted text clipped - 8 lines] >meter chooses a shutter speed. All subsequent shots will be made at >that shutter speed. In fact screw-mount lenses already worked in true aperture priority. There's no mechanical coupling to the aperture iris for a screw mount lens. But neither is there anything to hold in the pin that keeps the aperture wide open for full-aperture composition, etc., so screw-mount lenses just stop down as soon as the ring is turned. An interesting point to note, on a Pentax user's list, is that by far the loudest voices raised in complaint about the unusability of the 'crippled'(sic) mount come from people who don't own the camera in question. Amongst owners of the D bodies, however, there's much more of a 'no big deal - you soon get used to it' attitude. >In fact screw-mount lenses already worked in true aperture priority. >There's no mechanical coupling to the aperture iris for a screw >mount lens. But neither is there anything to hold in the pin that >keeps the aperture wide open for full-aperture composition, etc., >so screw-mount lenses just stop down as soon as the ring is turned. That's true. Thanks for pointing out the omission. >An interesting point to note, on a Pentax user's list, is that by >far the loudest voices raised in complaint about the unusability of >the 'crippled'(sic) mount come from people who don't own the camera >in question. Amongst owners of the D bodies, however, there's much >more of a 'no big deal - you soon get used to it' attitude. Exactly. The problem with Hyper Manual is that, on paper, it looks complicated. In use, it is very, very simple. But non-users would never know that. Actually, I wrote an article about the technical bases of all those Pentax metering stuff. And yes, the stop(ped) down metering with *ist D/DS/DL is easy and fast to make. BTW, here is my article:- http://www.geocities.com/ricehigh/K_Mount_Metering_Exposure_Bases.html However, the stopped down metering is not as accurate as the wide opened one, here is a test to compare between the two:- http://www.geocities.com/ricehigh/FAStar_85_1_4.html I would rather prefer Pentax had kept the old K-mount aperture coupler (for the transmission of the stopped down f-stop difference) as this is not really something expensive afterall. Nikon has just done this in the D200 and I hope the *ist D2 (if there will be one) will have this coupler re-born some days. Cheers, RiceHigh http://www.geocities.com/ricehigh I agree with you that newer Pentax DSLR has better digital image quality, provided that the user to shoot RAW. The in-camera jpeg of the *ist DL and DS are having lower resolution of which the difference can be seen easily at 100%. Even when viewed full-screen, the "feel" are different - of course the RAW converted Jpegs are better. Cheers, RiceHigh http://www.geocities.com/ricehigh Tony Polson wrote: >>Actually, they *don't* have a 'true KAF mount - it's a crippled version that >>relies on in-camera aperture setting [quoted text clipped - 23 lines] > D70 and significantly superior to the Konica Minolta 7D and 5D, all of > which use nominally the same 6.1 MP Sony sensor. I looked at it, and it doesn't seem to have all the controls of the *ist-D though (program auto, Aperature priority, Shutter priority, Metered Manual and bulb). Looking at the reviews online now, it supposedly does + "picture modes". I just didn't see the controls I'm used to and the picture modes are on the dial where I expected to find the controls. But I don't see the two wheels for the right hand to control aperature & shutter. And it I don't see how I'd dial in exposure compensaton without taking my eye from the viewfinder (which I can do with the *ist-D). The other thing was it takes SD cards and the *ist-D takes CF. Don't really want to have to carry around two sets of memory, so it's not acceptable as a backup body for my *ist-D. > It's so easy to take a swipe at Pentax because the company is not in > the same league as Canon and Nikon. But by being conservative, Pentax [quoted text clipped - 20 lines] > digital in a way that no other company can. The contrast with the > Konica Minolta disaster could not be more stark. The only thing is I hope the *ist-D successor has the full range of controls the *ist-D has. The Pentax *ist DS/DL/DS2/DL2 do have all exposure modes of Av, Tv, M and P plus picture modes. These DSLRs do all have one wheel but that don't cause much inconvenience to me btw. I do have both the *ist D and DS for quite a long time now. Regarding the EV compensation, on DS or alike, just push the +/-EV button by the index finger and turn the rear control wheel by thumb and there will be no need to take my eye away from the finder. SD card is not a real problem for me. I used to have 5GB CF cards and I had sold them all when I sold my *ist D. The new SD cards are damn cheap. Indeed, for Pentax DSLRs, no fast SD cards are needed and thus I just got the cheapest one from Kingston, which is a reliable brand I think (although their Toshiba chipset SD cards are slow). Nevertheless, SD cards have the advantage of being faster and smaller (and lighter too). And it seems to be the future dominant standard of DC memory cards, too. BR, RiceHigh http://www.geocities.com/ricehigh I have the DS. Image quality is excellent Focus speed is reasonably quick. 2.0 software update is avaiable online. Being in software for a living (IBM/Lotus developer) I find their software support excellent. Collin > I looked at it, and it doesn't seem to have all the controls of the > *ist-D though (program auto, Aperature priority, Shutter priority, [quoted text clipped - 7 lines] > shutter. And it I don't see how I'd dial in exposure compensaton without > taking my eye from the viewfinder (which I can do with the *ist-D). You must not have looked very closely. It does in fact have program auto, Aperature priority, Shutter priority, Metered Manual and bulb. You dial in exposure compensation without taking your eye from the viewfinder by pressing the Av button with your right index finger and turning the dial with your thumb. The level of compensation is indicated in the viewfinder. SignatureOne is always considered mad when one perfects something that others can not grasp. - Ed Wood |
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