Great pictures from Steve and Andreas!
Nikon S2, Nikkor-S.C 50mm f/1.4, 400-2TMY/Adox MCC 110.
The old Nikkor is also a Sonnar.
Erik.
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You are very much right again Erik! I don't remember for sure if mine had a haze which, surprisingly, I was able to get rid of mostly?
because the lens looked quite clean when I took it's photo:
Canon LTM f1.5/50mm by andreas, on Flickr
but right now, I just checked it, it has a rather strong haze across the full diameter of an inner element!
Makes me think that it may have had the same haze all along and that I took that photo of the lens in a way so that it does not show much of it.
Not cleanable alright, nevertheless I may open it one of these days to see if I can get rid just a bit of the haze.
Heat wave by bingley0522, on FlickrYou are very much right again Erik! I don't remember for sure if mine had a haze which, surprisingly, I was able to get rid of mostly?
because the lens looked quite clean when I took it's photo:
Canon LTM f1.5/50mm by andreas, on Flickr
but right now, I just checked it, it has a rather strong haze across the full diameter of an inner element!
With haze, it is always difficult. The Summaron 35mm f/3.5 from Leitz also suffers from it, but that is easy to remove. After some time however, it is again there..
Erik.

My non-Serenar Canon 50/1.5 developes haze periodically on the lens surface just behind the aperture blades. Thankfully, it wipes off easily. Most of the coating on this surface looks to have been eaten away by fungus long ago, so I assume that's why the haze always reappears.
Andreas, this one is for you, shot and printed today.
Nikon S2, prewar (uncoated) Zeiss Sonnar 50mm f/1.5 No.1628901, 400-2TMY, Adox MCC 110.
Erik.
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Thank you, Andreas, beautiful flower-shot.
Nikon S2, Zeiss Sonnar 50mm f/1.5 prewar uncoated, 400-2TMY/Adox MCC 110.
Erik.
20190730-L1001281.jpg by Chris Coppola, on Flickr
20190704-L1000933.jpg by Chris Coppola, on Flickr
20190521-L1009279.jpg by Chris Coppola, on Flickr
I'm particularly admiring the strong technical and artistic qualities of this shot, Steve. A very good performance by the lens and the human behind it.