Zeiss 35mm t2.1 mk2 f/kit

[Eduardo Sousa]

Hey all,

I have recently shot a short film with RED ONE and used ZEISS 35MM T2.1 MK2 F/KIT.
We had a unfortunate experience. Couple of shots that we used 16mm are soft although lens was set on infinity. However same lens with the same camera gave pristine images on the same day with some other shots. Again, lens was set to infinity.
Does this happen to anyone before? What are your thoughts?

Thanks for your time
E.S.

[Matthew Duclos]

Eduardo, Maybe a silly question, how far was the subject from the film plane?

[Eduardo Sousa]

Eduardo, Maybe a silly question, how far was the subject from the film plane?

Hey Matthew,

Over 3 meters, the lens should show infinity over two meters. The funny thing is pretty much nothing is in focus, in these shots. I mean if the object was to close to be infinity at least the back ground should be in focus. By the way we were shooting in a forest...

[Mick van Rossum, NSC]

Had an interesting experience as well; my Mk2 set which was fine on my Red M had trouble when I upgraded to MX; on a collimator, everything was fine, on camera all wide angles were off. In the end we re-shimmed all wide angles (16/20/24/32) to the camera backfocus. Ever since no problem at all, shooting 70 days now on my MX with the 2.1's. Some speculation; the new OLPF has a different thickness ? ( I know from SI2K their OLPF was so thick that all wideangles were off and had to be reshimmed) Never heard another story like mine.....

[Eduardo Sousa]

Had an interesting experience as well; my Mk2 set which was fine on my Red M had trouble when I upgraded to MX; on a collimator, everything was fine, on camera all wide angles were off. In the end we re-shimmed all wide angles (16/20/24/32) to the camera backfocus. Ever since no problem at all, shooting 70 days now on my MX with the 2.1's. Some speculation; the new OLPF has a different thickness ? ( I know from SI2K their OLPF was so thick that all wideangles were off and had to be reshimmed) Never heard another story like mine.....

This might be the reason Nick. To be honest I never thought of this or heard anything about it before but this sounds like a very simmilar issue.
Only thing that I can't get my head around is the inconsistancy. I don't understand how the same lens with the same camera and the same set up can give different focal results in infinity during the same day?

[Jose Lomeña]

This might be the reason Nick. To be honest I never thought of this or heard anything about it before but this sounds like a very simmilar issue.
Only thing that I can't get my head around is the inconsistancy. I don't understand how the same lens with the same camera and the same set up can give different focal results in infinity during the same day?

I have a 2.1 Set, I never had this problem. Inconsistancy?... I think it can be a human mistake.
Collimation is a problem of all lens... you only need to know this and move the "backfocus" of the redone.

What aperture do you use in any case?. zeiss 2.1 16mm is soft if you open too much. And collimation problems are bigger if you open to 2.1

Saludos,

Jose.