Re: Mirror lenses DS
SP The only lens that I know of and that gives 99% natural out of focus areas SP is Minolta 135 STF with apodization filter and two diaphragms - here is SP review of this extraordinary lens with some samples: SP http://www.magnuswedberg.com/docs/STF-review/ Now that's very interesting! I wouldn't say it gives a natural Boke, IMHO there is no thing as natural Boke, or is there? Is one curve of transition from light to dark better than other? Is a diagonal curve better than exponential? Or natural boke could also be one that doesn't curve at all, which is just a flat same-shade disk... So what's natural? But I digress :) The idea of putting a graduated filter in the nodal point of the lens to achieve the gradation of the OOF areas is neat. Although I am thinking if the similar hadn't been done before with gradual Waterhouse stops. Ok now, I could imagine a DIY project... Botching a long-focus 80mm symmetrical lens and adding such a graduated stop!!! Frantisek
Mirror lenses DS
Anyone here have any examples of the results of a mirror lens on a digital body? Just curious how well it works. Right now my tentative plan for the soccer match is (a) A200/4 (my son's) or perhaps a 300mm or 500mm mirror on the DS and (b) A100/2.8 on Super Program. Super Program will be iso400 BW body. Sincerely, Collin Sent via the WebMail system at mail.safe-t.net
Mirror lenses DS
Collin, here is a test shot I made with a Tamron SP 500mm mirror lens on my D. The sign is about 100 yards away. Note the peculiar bokeh. http://www.pbase.com/jamesk8752/image/42249768.jpg Here is a crop of the center of the image. Sharpness is not too bad, but contrast is low. http://www.pbase.com/jamesk8752/image/42249808 Have fun at the game!
Re: Mirror lenses DS
In article [EMAIL PROTECTED], [EMAIL PROTECTED] (Collin Brendemuehl) wrote: Anyone here have any examples of the results of a mirror lens on a digital body? Just curious how well it works. Right now my tentative plan for the soccer match is (a) A200/4 (my son's) or perhaps a 300mm or 500mm mirror on the DS I just tried it out of curiosity, with a 500/8.0 Tamron on an Adaptall K mount on the *istD. It works, from a mechanical point of view. I had to meter manually, like any other K-mount lens on a Pentax digital body. However, it is hard to hand-hold such a magnification, and you'll want to turn up the ISO rating on the body fairly high. The depth of field is also very small, which feels like it would be a problem with fast-moving soccer players. Pulling the JPEGs onto the computer, I find that I didn't focus accurately. The magnification - effectively a 750mm - also might be too high for shooting from the touchline. Overall, it feels more like a combination for cricket, where you can use a tripod, than for soccer. If there's another soccer match that you can try out lenses on first, I'd do that. -- PDML means I get more e-mail than spam!
Re: Mirror lenses DS
On 2005-06-07, at 18:58, Collin Brendemuehl wrote: Anyone here have any examples of the results of a mirror lens on a digital body? Just curious how well it works. I think it is possible to obtain good quality pictures with such a lens on digital. Here are examples from KMinolta D7D: http://forums.dpreview.com/forums/read.asp?forum=1035message=13569814 The problem can be right selection of model. From what I've read here and there, the best ones are Tokina and Sigma (still manufactured), but I guess Pentax 400-600 reflex should be good too. Mirror lenses generally have lower contrast than classic ones (but it should be easy to correct in case of digital), but they are free from chromatic aberrations. -- Best regards Sylwek
Re: Mirror lenses DS
On Tue, 7 Jun 2005, Sylwester Pietrzyk wrote: On 2005-06-07, at 18:58, Collin Brendemuehl wrote: I think it is possible to obtain good quality pictures with such a lens on digital. Here are examples from KMinolta D7D: http://forums.dpreview.com/forums/read.asp?forum=1035message=13569814 Yes, but what about the bokeh... Kostas
Re: Mirror lenses DS
Heck I had nothing better to do, that's not exactly true, I was looking for a further reason to procrastinate so I grabbed my *ist-D and Vivitar S1 600mm and shot off a sample. It's not bad. I prepared the shot as I would for the web so it's not as it would be direct from the camera. Noise reduction and a touch of USM, which I'd expect to be done by almost anyone shooting the *ist-D at iso 1600. Nothing special for focus, just focused on a section of concrete with stuff on either side. Hand held. http://www.mindspring.com/~webster26/PtxistDVivS1600mmMir.html Pentax *ist-D iso-1600 @ 1/125sec. Vivitar Series 1 600mm f8.0 Collin Brendemuehl wrote: Anyone here have any examples of the results of a mirror lens on a digital body? Just curious how well it works. Right now my tentative plan for the soccer match is (a) A200/4 (my son's) or perhaps a 300mm or 500mm mirror on the DS and (b) A100/2.8 on Super Program. Super Program will be iso400 BW body. Sincerely, Collin Sent via the WebMail system at mail.safe-t.net -- A man's only as old as the woman he feels. --Groucho Marx
Re: Mirror lenses DS
The problem can be right selection of model. From what I've read here and there, the best ones are Tokina and Sigma (still manufactured) I prefer the Tamron SD 500/8 to both the Sigma and Tokina. (Still have the former, no longer have either of the latter.) Mirror lenses generally have lower contrast than classic ones Agreed. (but it should be easy to correct in case of digital) Yes and no. You can modify contrast after the shot, but you can't later get back any subtleties already lost due to lack of contrast. but they are free from chromatic aberrations. Yes and no. Yes, if the lens has no refractive elements. Not quite true in the case of those that do. Fred
