gb hill
Veteran
This is a Jupitar 3 made in 1963. When I got it the lens was front focusing bad. Brian Sweeny told me to use a thinner shim to narrow the distance of the rear element to the film plane. I finally got around to making a shim for it. This is around f2 to wide open on my Bessa R. I know I should write this stuff down. Anyhow I'm happy with it.
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payasam
a.k.a. Mukul Dube
Good sharpness, good out of focus areas.
Looks good to me!
It's amazing what a small difference in shim thickness will do to a lens.
It's amazing what a small difference in shim thickness will do to a lens.
gb hill
Veteran
Thanks for the help! I think this is going to be a favorite.
payasam
a.k.a. Mukul Dube
I've grown quite fond of mine. Its performance is impressive for such an old design. I was wrong (other thread) to have held it responsible for what was actually the work of a perforated shutter curtain.
robin a
Well-known
Ya done good....................Robin
like2fiddle
Curious
That's a very impressive lens. What did you make the shim out of? I've thought of trying to use aluminum foil, but it seems as if that may be really difficult to work with.
ferider
Veteran
Great, GB, looks good to me.
Roger, I cut shims with scissors from empty coke cans. I like them being metal and this works well.
Cheers,
Roland.
Roger, I cut shims with scissors from empty coke cans. I like them being metal and this works well.
Cheers,
Roland.
raid
Dad Photographer
GB: Your results look excellent. You have done your job very well. I wouldn't know what to do.
Roland: This is a good idea!
cysasam
Established
Hi,
Doew the front focusing happen with all cameras? What about a FED 2 or a Zorki 3? Thanks!
Doew the front focusing happen with all cameras? What about a FED 2 or a Zorki 3? Thanks!
payasam
a.k.a. Mukul Dube
Roland, are not soft drink cans some sort of aluminium alloy?
It's really hard to say, and I believe the lenses were meant to be shimmed to the individual camera. Most J-3's that I've seen back-focus on a Leica standard camera, and a few have front-focussed. About 8 in 10 required some sort of adjustment, usually within 0.2mm to put them spot-on. That last one required less than 0.1mm, but it shows when used wide-open.
ferider
Veteran
Correct, Mukul, an aluminum alloy, I believe.
Roland.
Roland.
like2fiddle
Curious
Roland,
Thanks for the tip on the Coke can; I rarely drink soda, but this gives me an excuse to indulge
Thanks for the tip on the Coke can; I rarely drink soda, but this gives me an excuse to indulge
johannielscom
Snorting silver salts
I once shimmed a Canon 50-1.2 with thick sewing cotton thread. Trial and error approach: wind a meter of thread, reassemble and check, disassemble, cut a new thread with 10cms extra length, etc.
It worked fine and I liked the old feel of 'shimming' like this. I got it spot-on, although that took some time.
It worked fine and I liked the old feel of 'shimming' like this. I got it spot-on, although that took some time.
gb hill
Veteran
I used a hard plastic & cut it with scissors then trimmed away the center with an exacto knife. I like the soda can idea but the aluminum is paper thin & I probably would of had to make 2 or 3 shims stacked to achieve the same thickness, besides I can picture slicing my finger trying to make one.