Graywolf, You eyes are probably fine. I just find it unsatisfying, if the focus is off even when I receive very clear focus confirmation in the viewfinder.
You are right about the differences in the lighting situation - the first and the next two shot are almost two weeks apart! Lens testing is difficult, especially when using AF. My tests are far from good enough, but I believe my practice tests (casual shots) show, that I may have made the right choice, getting the Pentax. The Tokina lens was simply not sharp enough, which is quite odd, since it has received some very fine test results elsewhere. My sharpest tele photo test shots are still those made with the Pentax combo SMC-K 135mm + SMC-F 1.7 x AF Adapter. Unfortunately this combo means loosing 1.5 F-stop worth of shutter speed. I am looking foreward to trying out the FA 2.8 80-200mm ED(IF) at the next public pop, rock or jazz, outdoor concert - shooting at F. 4, 1/500 sec. from a monopod :-). Regards Jens Bladt http://www.jensbladt.dk -----Oprindelig meddelelse----- Fra: graywolf [mailto:[EMAIL PROTECTED] Sendt: 6. december 2005 05:14 Til: [email protected] Emne: Re: A better 70-200mm F. 2.8 In that first photo the bricks in the driveway give a pretty good idea of the DOF which looks to be about 4 bricks to either side of the rear bumper of the truck.in the first shot. Looks to me like your focus is just about right in that shot. The other 80mm 2.8 shots seem to be focused closer than the bumper. The framing and lighting vary somewhat between shots making it a bit hard to compare them to the first one, at least to my old eyes they look overall a bit fuzzy. graywolf http://www.graywolfphoto.com "Idiot Proof" <==> "Expert Proof" ----------------------------------- Jens Bladt wrote: >Small? 2104 x 1468 can easily fill you screen! >And yoyu're right - it's probably not the lens (although I had great >problems getting sharpness at all at F 2.8 - F3.5: >It may very well be the AF system. > >Yes, I use the term when the lens/camera is focusing further away than it >should - that is behind the point where the red square in the viewfinder is. >ASome times at the top or above the little circle that confirmes focus in >the *ist D. >In this shot, I focused at the white streamer (stensikkert.dk) - but look >how sharp the brick wall looks here http://www.jensbladt.dk/Test/rooms.html > >Compared to the second and third shot (made with the FA lens). It can't be >that the Tokina has a LOT better DOF at F. 2.8, can it? It must be because >the focusing is off. Behind the white board. OR this sample og the lens is >not good. > >I find the SMCP FA 2.8/80-200mm ED(IF) quite good, when focused manually. >Regards > >Jens Bladt >http://www.jensbladt.dk > >-----Oprindelig meddelelse----- >Fra: graywolf [mailto:[EMAIL PROTECTED] >Sendt: 4. december 2005 22:30 >Til: [email protected] >Emne: Re: A better 70-200mm F. 2.8 > > >The photos are rather too small to tell anything from. However, it is >most likely an auto-focus problem, not one with the lenses. > >Try manual focus. After you have the proper part of the image in what >you think is correct focus, go look out the window for 5 minutes or so, >then come back and tweek your focus as quickly and exactly as you can. >Now you can take your photo. Do that with the other lenses. Get back to >us with the results. > >I would look at every other posibility with focus problems before >blaming the lens. > >And by the way, from a technician's point of view back focus problems >means the lens is not focusing the image exactly the flange to film >distance from the lens mount. I do not think that is how you were using >the term. > >graywolf >http://www.graywolfphoto.com >"Idiot Proof" <==> "Expert Proof" >----------------------------------- > > > >Jens Bladt wrote: > > > >>I have been trying out three different lenses in the 70-200mm range. >>Sigma EX 2.8/70-200mm APO >>Tokina AT-X Pro 2.8/80-200mm >>SMCP-FA 2.8/80-200mm ED(IF) >> >>All of them seem to suffer from Back Focus. The Sigma not much, though. >>Had I been offered a used Sigma, I probably would have bought it. >> >>I published a small test showing the problem. >>Due to Back Focus (i BELIEVE), my SMCP F-4-5.6/70-210mm is the sharper one >>at F. 5.6. >> >>Please take a look and feel free to comment: >>http://www.flickr.com/photos/bladt/sets/1509814/ >> >>Regards >>Jens >> >> >> >> >> >> >> >> > > > > > >
