Andrea B. Posted September 11, 2016 Share Posted September 11, 2016 Meyer-Optik Görlitz 35mm f/4.5 PrimagonBlades: 10Elements: 4/4FFD: 45.46mmFilter: 49mmMount: M42x1 Link to comment
Kevin Bannister Posted August 10, 2020 Share Posted August 10, 2020 Meyer-Optik Görlitz 35mm f/4.5 PrimagonBlades: 10Elements: 4/4FFD: 45.46mmFilter: 49mmMount: M42x1 Hi Birna, I am working on adapter for this lens. Is the UV transmittance good? Link to comment
ulf Posted August 10, 2020 Share Posted August 10, 2020 The UV transmittance is not very good, but still usable, indicated to 345nm here:https://www.fotozone.../&hl=comprisingYou might have to register to see this list. Observe that the noted cutoff wavelengths are for -3 stops!In reality the usable UV-ranges normally are some 15-20nm closer to the visual range, beginning at 400nm Link to comment
Andrea B. Posted August 12, 2020 Author Share Posted August 12, 2020 Ulf, I could not access that link. Seems to be restricted to Fotozone members? ********** Kevin --Here is a test photo of my 5 Spectralon standards along with some flowers having typical UV-signatures. You can see that the Meyer-Optik Görlitz 35/4.5 is UV-capable. The flowers were in a rather sorry state from the heat, but that does not affect the capture of their UV-absorption and UV-reflectivity.http://www.ultraviol...primagon-for-uv I was using a BaaderU UV-pass filter which peaks around 350 nm. So this particular copy of the Meyer-Optik seems to be good enough. I wouldn't call it "not very good". Do note, however, that there are sometimes slightly different versions of these old lenses. If the one you have looks like the photos above, then you can expect results as shown. . Link to comment
ulf Posted August 13, 2020 Share Posted August 13, 2020 I have an old membership there. I originally found the link in the lens sticky for KDS.It is to the page where Klaus is comparing many old lenses's showing the -3Stop point he found with a horizontal bar-graph.I have downloaded the image, but do not know if it is OK to share due to copyright rules. Link to comment
Andy Perrin Posted August 13, 2020 Share Posted August 13, 2020 Ulf, I know the one you mean, and if I'm not mistaken, all the info from that list was included in our lens sticky. So we have the information already even if not the graph. Link to comment
ulf Posted August 13, 2020 Share Posted August 13, 2020 Ulf, I know the one you mean, and if I'm not mistaken, all the info from that list was included in our lens sticky. So we have the information already even if not the graph.Except that in the sticky there is not mentioned the very strangely defined decision level of attenuation to 12.5% of max transmission. (-3 stop)This gives very nice and low transition wavelength values that say little about how useful a lens is for common UV-photography as it do not take into account the slope of the transmission decay. A much better way to describe lenses would be to define the -1 stop point and transmission at 365nm. Link to comment
Andy Perrin Posted August 13, 2020 Share Posted August 13, 2020 Heh. Maybe Andrea should update the sticky to put a note about that. Link to comment
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