Author Topic: Infinity  (Read 763 times)

Infinity
« on: 18 June, 2020, 11:38:56 am »
I don't have a manual camera film camera to check this with and haven't checked all my manual lenses yet.

When focusing at infinity with a manual lens should it be focused when then lens focus ring is turned so that it's against the stop at the infinity end of the range?
With my m4/3 adaptor I am finding that I have to back off slightly from the maximum to get good focus at infinity (well what passes for infinity here which is the hill about three miles away).

It's about thirty years since I played with a real film camera with a manual lens and I cant remember how they used to work.
I think you'll find it's a bit more complicated than that.

nicknack

  • Hornblower
Re: Infinity
« Reply #1 on: 18 June, 2020, 01:03:46 pm »
Should be at the end stop, I seem to remember.
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Jaded

  • The Codfather
  • Formerly known as Jaded
Re: Infinity
« Reply #2 on: 18 June, 2020, 01:18:51 pm »
My lenses go further than infinity, so that might not work?
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Re: Infinity
« Reply #3 on: 20 June, 2020, 11:08:30 pm »
Most photo lenses go past infinity,
It's partly so you can still get infinity if you play IR, and partly to allow for variations in the lens mount to sensor distance.

With video lenses on the other hand, there's a hard stop at infinity, and the distance scale on the lens is expected to be spot on. With the better video cameras, there's lens mount to sensor adjustment to make sure it's all correct.

Re: Infinity
« Reply #4 on: 21 June, 2020, 09:41:54 am »
Thanks all. I can stop worrying about it now :)
I think you'll find it's a bit more complicated than that.