Opticallimits

Hello all.

 

I have a question about the Metabones Leica M / Sony E adapter, and I hope someone around here knows the answer:

 

I'd like to know whether you can focus to infinity, or past infinity when using this adapter. If you use a good manual lens, and turn the focus ring all the way in the appropriate direction: Are faraway objects pixel-peeping sharp then, or do you have to turn back the focus ring a little bit?

 

Thanks for any insight

There's no such thing as infinity.  There are the stars, millions of lightyears away, or distant mountains mere miles away.  At no iris size (=fl/f-no.) are they both in critical focus. 

 

If the adapter is micrometers too close to the sensor, the lens will be "backfocused" at "infinity," ie: focused further than you wish.  If the adapter is micrometers too far from the sensor, the lens will be "frontfocused" at "infinity," ie: focusing at a closer 'infinity' than you may desire. 

 

If the lens contains low dispersion glasses, the focal plane is temperature dependent as well.