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The Diopter Thread.

Tito Ferradans

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I've got this one & if i'm not mistaken i think it is about +1.6 - its a very good buy & cheap to boot!


Bioskop, I think you mean the 62mm one, that`s +1.6 and achromatic. The 72mm are usually +1, and both are still quite cheap.


I was told its not an acrobatic one :)


That's it. From now on, I'm never writing achromatic again. Just acrobatic. It's muuuch more apropriate, and enhances their quality and performance! hahahahahahaha :D

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  • 2 weeks later...

ok what about diopter for one of those big projection lenses? where front lens is like 101 mm in diameter or across any ideas how to mount a diopter on them? i was thinking or was told 82mm-72mm step down ring then mount the diopter to the ring.

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If you say the front measures 101mm you should get one as big as you can to cover as much glass as possible. I believe the front glass element is a bit smaller than 101, but you're in trouble! Covering the glass is essential to avoid (more) vignetting, so I'd suggest an 86mm diopter kit, one of the cheapest options:




You just gotta find a way to attach it to the front of the lens. If you're saying that it already has an 82mm thread, then you should go with 82mm diopters. A cheap kit too.


By what you said in the message, you should be fine with a +1 and +2, for closer focus. I'll update the first post with feet measurements, but for now, the math for maximum focus is:


S = diopter strength (+0.5, +0.6, +1, +2, etc)

MaxFm = maximum focus distânce, measured here in METERS


MaxFm = 1 / (S)


or, for feet measures:


S = diopter strength (+0.5, +0.6, +1, +2, etc)

MaxFf = maximum focus distânce, measured here in FEET


MaxFf = (3.3 / S)


A +2 diopter maximum focus distance is about 1.5ft, and a +1 gets to 3ft.

Check the first post to get a better explanation about this math part. You'll never have any more trouble finding out which strength works best for you. :)

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Got a tip from a friend!


Kodak Retina TII/60 are 60mm diopters, single element, +0.25.

Pretty common on ebay, and cheap too. Take yours before they disappear! :)


From the Kodak Retina Reflex Manual :
The 135 mm. lenses can also focus on distances nearer than 14 ft.
For this purpose a TII/60 supplementary is used for close-ups between about 13 and 7 ft

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  • 4 weeks later...

Got an interesting diopter. It is a B+W 0.5, 67mm. Found it on ebay, looks brand new (from a camera store), but quite old. I cannot find any documentation of it's existence, even on the B+W website. Maybe some of you know about it, but new to me. Now I just have to get the anamorphic lens to test it out, but I am hoping it should be good, considering the brand.

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