diegobuono Posted October 28, 2002 Share Posted October 28, 2002 Yesterday, on an exhibition of used gear in Italy, I saw a CF 105 UV in good condition (apart the plastic/rubber part of focussing ring that was loose) for 1.450 euros. Wasn't this lens a rare one for special purposes? Why this low price? It is good for general photography? Thank to all for your precious help. Link to comment Share on other sites More sharing options...
ulrich_ploedereder Posted October 29, 2002 Share Posted October 29, 2002 I don't think so. I believe you can't use this lens for general photography. It's built for the near UV spectrum and the optical components are made of quartz. But: ask Zeiss ! Regards Uli Link to comment Share on other sites More sharing options...
q.g._de_bakker Posted October 29, 2002 Share Posted October 29, 2002 Diego, Yes, you can (!) use this lens for general photography. It should be really good too (no chromatic aberrations at all). Maybe you should add a UV-filter though. Why this low price? Good question.It certainly isn't because the rubber is loose... ;-) It is a very expensive special purpose lens. So special is its purpose, that it would be very hard to find someone in dire need of such a lens. Maybe that (noone looking for it) is part of the reason? This lens has Fluorite elements. And if i remember correct, these do erode a bit due to atmospheric conditions (air humidity). Maybe it is in need of a repolish? Anyway, Eu 1450 doesn't sound bad. I hope you bought the thing? Link to comment Share on other sites More sharing options...
diegobuono Posted October 31, 2002 Author Share Posted October 31, 2002 This could be a question for Mr. Kornelyus Fleischer. Anyway I have found this thread http://www.photo.net/bboard/q-and-a-fetch-msg?msg_id=000mFK Link to comment Share on other sites More sharing options...
kornelius_j._fleischer Posted November 1, 2002 Share Posted November 1, 2002 The Zeiss UV Sonnar 105 was developed for use with ultraviolet light. It was/is used in scientific and forensic laboratories. It was discontinued more then a decade ago, since the market was saturated. Since general photography has no use for ultraviolet light (human beings are unable to see it), the UV Sonnar 105 is not recommended there. Link to comment Share on other sites More sharing options...
q.g._de_bakker Posted November 1, 2002 Share Posted November 1, 2002 Kornelius, Please allow me to put in two more questions.First, when you say this lens is not recommended for general photography, is it because it is a poor performer, or just because there is no need for such a lens in general photography? And is there any truth in the stories i have heard, saying that the fluorite elements do erode and need repolishing now and again? Link to comment Share on other sites More sharing options...
diegobuono Posted November 5, 2002 Author Share Posted November 5, 2002 From an old Hasselblad booklet I have found: Zeiss UV Sonnar 105 to be used in wavelength between 215-700nm. The human eye can see wavelength between 400-700nm therefore I think the lens can be used also in the normal spectrum. But may be that is useless to use this lens in general photography. May be there can be some advantage in aerial photography or mountain were UV are stronger? His minimum focus distance is 1.8 m and the max aperture is f4.3 Link to comment Share on other sites More sharing options...
kornelius_j._fleischer Posted November 5, 2002 Share Posted November 5, 2002 Correct, the UV Sonnar can be used in normal spectrum delivering good image quality. However, there is a Planar 3,5/100 which will deliver excellent image quality in normal spectrum and should therefore be preferred. Aerial photography usually avoids short wavelengths, especially UV, in order to obtain maximum clarity. So the UV Sonnar should be of very little use for aerial photographers. By the way: the Planar 100 is the favourite lens of almost any aerial photographer using Hasselblad. Fluorite elements can suffer from being exposed to moisture. Zeiss therefore applies a coating which protects the optical surfaces of fluorite elements. As long as this coating is not damaged, the fluorite elment will stay in perfect condition. Those who are fascinated by the UV Sonnar and can get their hands on such a lens: feel free to experiment with it and enjoy the special photos you can make provided you have film which can record UV. But do not expect visual wonders with pretty normal subjects in very normal light. Link to comment Share on other sites More sharing options...
dsms photos Posted January 20, 2006 Share Posted January 20, 2006 I finally after years of search found a MINT example of that lens. Now I wonder which film and/or digiback could help me to explore its capabilities?? Any comments welcome! Regards Klaus Link to comment Share on other sites More sharing options...
q.g._de_bakker Posted January 20, 2006 Share Posted January 20, 2006 Klaus,<br><br>As far as the additional (compared to other lenses) range goes, any film will do.<br>How well do digital sensors do below 400 nm? Link to comment Share on other sites More sharing options...
dsms photos Posted September 1, 2008 Share Posted September 1, 2008 I now know that it reaches about 300..320nm. More may be found here on my BLOG http://photographyoftheinvisibleworld.blogspot.com/ Link to comment Share on other sites More sharing options...
dsms photos Posted September 20, 2008 Share Posted September 20, 2008 I have one in MINT condition, all complete in box , let me know if you need one. Link to comment Share on other sites More sharing options...
dsms photos Posted April 13, 2009 Share Posted April 13, 2009 I have two now, one MINT all complete which is in my collection and a working example with excellent optics. SO one is for sale in case of interest. Here how it looks like: <a href="http://www.macrolenses.de/ml_detail_sl.php?ObjektiveNr=301">http://www.macrolenses.de/ml_detail_sl.php?ObjektiveNr=301</a> Link to comment Share on other sites More sharing options...
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