Showcase Helios 92 90mm ƒ2 Projector Lens

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Jan 3, 2014
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Location
Baltimore, MD
Here's are today's test shots of my adapted Helios 92 90mm/ƒ2 slide projector lens. It was about to storm so I quickly hit a couple spots near my home. Reasonably sharp but hard to nail with a razor-thin focus field; missed focus on several of these but ¯\_(ツ)_/¯. Most are autolevelled; three are SOOC and so marked. Check out the adaptation over on the Show us what your adapted lens looks like on your camera forum.

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P4930224
by Lewis Francis, on Flickr

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P4930238
by Lewis Francis, on Flickr

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P4930239
by Lewis Francis, on Flickr

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P4930245
by Lewis Francis, on Flickr SOOC

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P4930247
by Lewis Francis, on Flickr SOOC

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P4930251
by Lewis Francis, on Flickr

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P4930253
by Lewis Francis, on Flickr

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P4930260
by Lewis Francis, on Flickr SOOC

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P4930262
by Lewis Francis, on Flickr

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P4930263
by Lewis Francis, on Flickr

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P4930265
by Lewis Francis, on Flickr
 
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Joined
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  • Thread Starter Thread Starter
  • #4
How’d you do that? Are there universal apertures you can get or something? Or is this part of a new focusing helicoid? Forgive my ignorance! The lens itself seems to give some pretty nice results.
Thanks! It's an aperture with male and female m42 threading. The helicoid I attached the lens to has enough throw to compensate for infinity focus when I add the threaded aperture module.
 

Mountain_Man_79

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Thanks! It's an aperture with male and female m42 threading. The helicoid I attached the lens to has enough throw to compensate for infinity focus when I add the threaded aperture module.
Ah. Ok. Makes sense. And you answered the next question, which would’ve been, is focus affected. I imagine that still changes the focal length of the lens a bit though still? Not that I suppose that matters greatly.
 
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  • #6
Ah. Ok. Makes sense. And you answered the next question, which would’ve been, is focus affected. I imagine that still changes the focal length of the lens a bit though still? Not that I suppose that matters greatly.
Not the focal length but potentially changes the infinity and close focus distances, which is why I went with the longer-throw helicoid.

adaptors.png
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Baltimore, MD
  • Thread Starter Thread Starter
  • #7
Ok, so I lied about preserving infinity focus -- my helicoid doesn't have enough throw on the far end to reach infinity after all. Stopping down a bit definitely makes it easier to nail focus and bumps up overall sharpness, I think. Most have had levels auto'd, some are marked SOOC. GX7.


P4930739 by Lewis Francis, on Flickr


P4930728 by Lewis Francis, on Flickr


P4930735 by Lewis Francis, on Flickr


P4930726 by Lewis Francis, on Flickr


P4930719 SOOC by Lewis Francis, on Flickr


Requisite flower example by Lewis Francis, on Flickr


Requisite flower example II by Lewis Francis, on Flickr


P4930707 by Lewis Francis, on Flickr


P4930702 by Lewis Francis, on Flickr
 
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