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Hey, that looks just like a Sonnar!😀Nikkor 5cm F1.5, wide-open...
I've read that the Nikkor-SC 5cm F1.5 was formulated in 1937 and that the Japanese had a supply of Schott glass. Japan hired German optical engineers. The Nikkor renders very much like the v3 Sonnar.Hey, that looks just like a Sonnar!😀
Since I like this look, you would think I would also have a small collection of sonnars. But, looking through my lens cupboard, I see very few sonnars. My "go to" sonnar in 50mm is my 1957 J-3 that Brian shimmed (and whatever else he did to it). Supposedly not as good as a 1956 or earlier, but I wouldn't know. I'm just a poor caveman unaware of your modern ways. I do have to manage some minor focus shift wide open and close in. Part of the charm, right?
I thought about the new Lomo J-3+ when it came out. I'm glad I didn't. I rather wish I could acquire an early lens with good glass and enough integrity to be pampered into a "Brian-level" lens. But, with changing market dynamics and overall rising prices, I'm much less inclined to play the game and attempt an acquisition (or two/three). The good ol' days are over; so I'm told. 🙁
To add a bit to what Rauber said, the f2 lenses are less expensive than the f1.5 lenses. I endorse rauber's recommendation for a Zeiss-OptonThat is what I tried to tell with my examination. You do not have to buy 50 Sonnars to find a good one. You don't even need to spend a fortune for a single lens. If you really want to enjoy a nice and sharp Sonnar 50 your best choice is look for a Opton Sonnar. Those were made in high numbers and there are hundreds out there available and some are really cheap. Zeiss in West Germany had a pretty solid quality. You have to look out for separation on lenses with serials > 1.6M though. And not every Sonnar 50mm f/1,5 might be super sharp but the T coating of the time was good and gives the images a contrasty look and build quality is very solid.
My surprise find are the all Chrome f11 Sonnars. They some seem to be equally sharp like the post-war Opton Sonnars. And even those that are not up to this level are sharp and build like a tank. And they were made in huge numbers. At this time Zeiss Jena had stabilized their production and the build quality is very good until the wartime changed everything. But those Chrome Sonnars are not coated. There are some T coated samples but they are rare and the wartime coating is not as effective. Prices for those Chrome Sonnars are pretty cheap too. All those Sonnars that were made in huge numbers do not fetch high collectors prices.
You can even buy a nice and clean Canon 50mm f1,5. When I got mine I was impressed with the sharpness. Unfortunately in my latest test it was not up to the Optons level but only by a tiny fraction. Since Canon started production late after the war the production quality might even be better than that of Zeiss itself. The Canon is build like a tank too. Very heavy and Chrome.
I think that "Brian-level lens" should become a thing on RFF! I will try my best. For example "Yeah, this lens is a BLL for sure!"I thought about the new Lomo J-3+ when it came out. I'm glad I didn't. I rather wish I could acquire an early lens with good glass and enough integrity to be pampered into a "Brian-level" lens.
Your lens is probably fixable. I have rectified a number of messed up Jupiter 3 lenses, and a couple of goofy J3+ lenses, and I am no where near as good as other folks. In my opinion, these lenses are worth fixing.Yes, the J3+ did not kept up with the hype. All the improvements sound good on paper but unfortunately the assembly seem to be an issue on the new Jupiters. Mine does not reach infinity too. And it looks like my Jupiter suffers from sever decentering. That was the reason why I have not tested it with the other Sonnars in my bookshelf test.