Leica Jupiter-3 Plus Compared with Three Rare Sonnar lenses

[Brian]

Check the rear group- is it coated?

I've seen most of the 1950~1953 KMZ J-3's with uncoated rear groups, like my ZK. the color rendition is different from my wartime Sonnar.

 

[M. Valdemar]

I checked the rear group. Very hard to tell.

The front element definitely has a light purple coating. I can't tell if the rear group is coated. There is a yellowish tinge on the rear element that I don't see on the front elements. There might be a little purple, but maybe a reflection from other elements.

The attached photos look somewhat different than by checking by eye.

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[Brian]

I probably have some pictures with you lens archived- I always shoot some test images. Front purple coating looks normal, I'll bet the rear is not coated.