Jupiter 3 oof lights

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clintock

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With my trusty fed 2 and jupiter 3 combo, I went to visit santa at the zoo-
I noticed that the little clear christmas tree lights appear as seagull wings or trumpets when approaching the edges of the frame. Is this normal for the old chrome J3?
In daylight things are sharp and ok, it's just point sources near the edge in darkness when out of focus.. sorta cool I guess.
 

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I've got several shots like that using that lens on various bodies, all just like that.
All the lights in that photo are the little clear common cheap christmas tree bulbs.. The bulbs are clear and the filaments are about 2mm long, so at any distance at all they may as well be point sources. Shot at 1/60 wide open.. I wonder if the lens was taken apart ages ago and an element put in backwards or something..
here's a couple more from that same night, sorry about the total lack of any qualities besides the weird lights to be found in these snaps!
Also same lens, roll and camera the next day outside in the sun, with a 100% of the trash can to the side of the frame.. I think about f5.6 fuji 400 costco noritsu..
Weird.
 

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I just acquired a J-3 (marked as Sonnar Copy). Since I only plan to use it indoors and at night, this will be very interesting.


Clarence
 
Looks like fairly extreme coma to me. Stopping down will minimize this but that sort of defeats the purpose of having the J-3...
I haven't seen this with my lenses but I don't have a J-3 that will focus so I'm "stuck" with my J-8 as my fast 50.
One other fix might be to shoot from further back and crop the edges of the frame--use more of the center of the image, in other words.
Dunno if this aberration is simply the nature of the lens or if it means that it's been mis(re?)assembled?
I like the first of the last examples you shared, actually.
Rob
 
Please try a brick wall test >50 feet and a set of road lights at night, road at right angles to lens axis >> 50 feet.

If it is ok at medium and far distances you were too close... otherwise the lens may have been damaged or bodged.

I'll do the same and report/post scan, with both of mine.

Noel

P.S. the triplet is very sensitive to manfacture, element separation (axial) might do this.
 
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The "butterflies" are in concentric circles. This shouldn't happen with the J-3. Something wrong with the lens, I'm afraid.

Roland.
 
Clint...

Dont despair, you will note that Einolu's pretty circles are not too round... his shots are low contrast, Sirus (the star) is the acid test, on a perfect lens on a gin clear night no city within >100sm, there will be angel wing artifice, but they will be really small wings.

The lens designer when she plots off axis rays trys to minimise the angels wings, at infinity and at 1m. Nowdays it is a software programme...

Yours are large because there is probably something wrong.

There are two likely scenarios:
- someone has frackenstined you lens from more then one J3.
- some one has omitted a shim/spacer after removing fungus, or after swapping all the optics, e.g. did not realise that the old spacer was way off.

There are people on this forum who might wet their pants to fix your lens if you pay the postage, alas not me I dont like lenses, beyond removing fungus.

What year is your lens? Henry Shearer the doyean of Contax maintenance says the Zeiss 1.5 lenses had/have a location problem, I though the Ru addressed this but if yours is very early they might not have detected in time.

I'm still going to test mine, the last thing I need is too many angels on my Xmas tree, I've too many candles on the birthday cake already...

Noel
 
I'm not despairing, I think it's sorta neat, how it can seem sharp yet be so weird at the same time.. It's a '57 model, with no dust or fungus inside, so it pretty much must have been opened after all at least once. I may try to find another some day, but I have more ltm 50 than I can count.

Want more angels on the tree? I think I focused on the white wire..
 

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This is a severely aberrant optical system. There are probably optical misalignments and/or incorrectly made optical elements. Not unsual for Soviet optics or this lens in particular (from what I have heard).
 
David,I think the aberrations are axially symmetric but the center doesn't seem to me to be quite centered in the frame. Which I would guess is poor collimation.
Rob
 
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