tag:blogger.com,1999:blog-4063079619074407721.post7406020792415214043..comments2023-07-26T04:24:52.429-07:00Comments on PENTAX DSLRs: You thought you couldn't use any DA/DA* lenses on future full frame DSLRs from Pentax? Well...think again. (See Update) By: Yvon BourqueAnonymoushttp://www.blogger.com/profile/16363645754592641317noreply@blogger.comBlogger14125tag:blogger.com,1999:blog-4063079619074407721.post-45748002418364440542008-10-29T11:44:00.000-07:002008-10-29T11:44:00.000-07:00Michael,I don't believe that would be an issue. Th...Michael,<BR/><BR/>I don't believe that would be an issue. There is plenty of room between the mirror and the lens flange. Measuring my 35mm camera, there is 19.78mm from the edge of the mirror to the face of the lens mount flange. On the K20D, the dimension is 18.31mm. That is 1.5mm shorter so the DA lenses have approximately 1.5mm more room when used on a 35mm camera.Anonymoushttps://www.blogger.com/profile/16363645754592641317noreply@blogger.comtag:blogger.com,1999:blog-4063079619074407721.post-79274739833159734342008-10-29T10:45:00.000-07:002008-10-29T10:45:00.000-07:00Yvon, you truly are a master Pentaxian, that's for...Yvon, you truly are a master Pentaxian, that's for sure. I just have one question to ask about DA and full frame. Is it true that some DA lenses are at risk of damage in a 35mm SLR? I seem to remember there was some indication that they protrude farther into the camera body than 35mm lenses.Michaelhttps://www.blogger.com/profile/18202734714904566995noreply@blogger.comtag:blogger.com,1999:blog-4063079619074407721.post-43489879386832461912008-10-28T17:30:00.000-07:002008-10-28T17:30:00.000-07:00It would be nice to know what the aperature was on...It would be nice to know what the aperature was on the 35mm camera. Is there a way to find out?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-4063079619074407721.post-74594511167642313392008-10-28T15:56:00.000-07:002008-10-28T15:56:00.000-07:00Good work, Yvon.My own limited "testing" has produ...Good work, Yvon.<BR/><BR/>My own limited "testing" has produced similar results. The 40mm and 70mm DA primes seem to work just fine for full frame but the 21mm vignettes very heavily. From looking through the viewfinder, my 16-45 seems to be OK from about 21mm onwards but that's just through the finder. It's a pity that Pentax don't appear to have any plans to introduce a full frame <BR/>DSLR because they could steal a march on the competition when it comes to size and weight.Bruce Robbinshttps://www.blogger.com/profile/13888340033630703603noreply@blogger.comtag:blogger.com,1999:blog-4063079619074407721.post-86444966931368857102008-10-28T15:47:00.000-07:002008-10-28T15:47:00.000-07:00Hello Yvon! You never cease to impress us with you...Hello Yvon! <BR/><BR/>You never cease to impress us with your Blog! Really, all those articles (about the products) to which you must obviously spend a long time to create, are worthy of mention. We should nominate you as being the most popular “Pentaxian". <BR/><BR/>Therefore, I invite all who contributed to this site with their comments, to email Pentax and to inform them of their enthusiasm towards Yvon and his Web site! (Blog). <BR/><BR/>On a different note: I notice that in your last article on the compatibility of the DA*/DA lenses to the full size format (24 X 36 FF), one can use these lenses on a 35mm SLR. That will prove once again that the Pentax products will still remain the choice for years to come. Thank you for all these articles…. we are very appreciative! <BR/>JPAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-4063079619074407721.post-59760539242462013422008-10-28T14:18:00.000-07:002008-10-28T14:18:00.000-07:00Bonjour Yvon!Tu ne cesses de nous épater par ton B...Bonjour Yvon!<BR/>Tu ne cesses de nous épater par ton Blog!<BR/>Vraiment, tous ces articles (sur les produits) auxquels tu dois évidemment passer de longs moments à créer sont dignes de mention.<BR/><BR/>Nous devrions donc t'inscrire en nomination comme étant le "Pentaxian" le plus populaire.<BR/><BR/>J'invite donc tous ceux et celles qui ont contribué à ce site par leurs commentaires, de faire parvenir un courriel à Pentax et leur faire part de leur enthousiasme envers Yvon et son site Web!(Blog).<BR/><BR/>Sur une note différente: je remarque que dans ton dernier article sur la compatibilité des objectifs DA*/DA au format pleine grandeur (24 x 36 FF), on peut donc utiliser ces objectifs sur un appareil "normal", non-DSLR.<BR/>Cela prouvera encore une fois que les produits Pentax demeurent encore LE choix pour des années à venir.<BR/><BR/>Merci pour tous ces articles .... nous en sommes très appréciatifs!<BR/><BR/>JPJPhttps://www.blogger.com/profile/14031432135765689317noreply@blogger.comtag:blogger.com,1999:blog-4063079619074407721.post-37940071987022540792008-10-28T08:28:00.000-07:002008-10-28T08:28:00.000-07:00odyn, All shots were taken without the hoods.odyn, All shots were taken without the hoods.Anonymoushttps://www.blogger.com/profile/16363645754592641317noreply@blogger.comtag:blogger.com,1999:blog-4063079619074407721.post-56223512544681783732008-10-28T08:27:00.000-07:002008-10-28T08:27:00.000-07:00Cassio,You are correct aboutsome problems at the e...Cassio,<BR/><BR/>You are correct aboutsome problems at the edges. However, some could be fixed with some post processing. Remembering that only about 5% of the DSLRs are used by Professionals, it may not be as crucial to the average photographer as a hobby. My point is to show that if Pentax does produce a full frame sometimes in the future, you don't have to necessarilly change all of your lenses. Also, future FF DSLR will likely have more pixels to work with and cropping may still produce better pictures than the APS-c DSLR of today.Anonymoushttps://www.blogger.com/profile/16363645754592641317noreply@blogger.comtag:blogger.com,1999:blog-4063079619074407721.post-70370435900693801542008-10-28T08:21:00.000-07:002008-10-28T08:21:00.000-07:00Miserere,IFrom the "get-go", I knew this was not g...Miserere,<BR/><BR/>IFrom the "get-go", I knew this was not going to be a scientific test. It does show that the Primes do a heck of a lot better. My next step would be to get one of the latest Pentax 35mm SLD that the aperture can be selected from the camera. To be fully accurate, one would have to test one lens at a time and at every aperture, Maybe that could be a weekly topic with one lens a week. I'll see if I can find a used Pentax 35mm SLR on Ebay with that capacity.Other readers could also help with the lenses I don't have.Anonymoushttps://www.blogger.com/profile/16363645754592641317noreply@blogger.comtag:blogger.com,1999:blog-4063079619074407721.post-47551581048641722492008-10-28T08:16:00.000-07:002008-10-28T08:16:00.000-07:00Jostein,I think that the 16-45mm K20D images are b...Jostein,<BR/><BR/>I think that the 16-45mm K20D images are backward. The 16mm shot needs to be reversed with the 45mm sgot and vice versa. It was getting late and I was rushing to put the article on the blog. Thanks to pointing it out.Anonymoushttps://www.blogger.com/profile/16363645754592641317noreply@blogger.comtag:blogger.com,1999:blog-4063079619074407721.post-42944706716296582682008-10-28T06:24:00.000-07:002008-10-28T06:24:00.000-07:00This test could really use a redo with apperture c...This test could really use a redo with apperture controlled. <BR/>I myself find the DA 70mm results most interesting. It seems as if there was some vignetting on the dslr. Were they shot with lense hood off/on?Odynhttps://www.blogger.com/profile/14257326678736686832noreply@blogger.comtag:blogger.com,1999:blog-4063079619074407721.post-23351597528014819092008-10-28T05:55:00.000-07:002008-10-28T05:55:00.000-07:00Yvon,Could you have a second look at the "DA 16- 4...Yvon,<BR/>Could you have a second look at the "DA 16- 45mm @ 16mm" shots? The AOV is smaller than for the 18-55mm shot... <BR/><BR/>Best,<BR/>JosteinAnonymoushttps://www.blogger.com/profile/14562861494130475668noreply@blogger.comtag:blogger.com,1999:blog-4063079619074407721.post-36652940126623802332008-10-28T05:44:00.000-07:002008-10-28T05:44:00.000-07:00Yvon, it's a shame you don't have one of the film ...Yvon, it's a shame you don't have one of the film cameras that allows you to control the aperture from the body, then you could test vignetting at different apertures.<BR/><BR/>I'm not surprised by your results; the lenses that vignette are those zooms that were designed specifically to replicate the old 35mm FoV on APS-C. There is no point to using these lenses on a full-frame sensor anyway, so who cares if they vignette? :-)Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-4063079619074407721.post-14879082487573039142008-10-28T05:08:00.000-07:002008-10-28T05:08:00.000-07:00Very interesting test, none of the tested prime le...Very interesting test, none of the tested prime lenses showed vignetting.<BR/><BR/>It'd be good to know which aperture was used. I believe that lenses with no aperture ring used in old bodies will always work in the minimum aperture (F22-F32, depending on the lens), but I cannot assure it. If that's the case wider apertures may, perhaps, show some light falloff near the image corners.<BR/><BR/>Another possible issue is image quality near the borders. If the lens was designed for APS-C sensors, even if it covers full frame, the image quality in the borders of the FF sensor may not be good as in the APS-C area. Some aberrations such as field curvature, astigmatism, coma and image distortion are usually harder on the edges.Unknownhttps://www.blogger.com/profile/17248800651937058264noreply@blogger.com