[Konvas] 16mm -> 35mm lens (a silly question)

[Peter Haas]

On Nov 13, 2008, at 1:29 PM, H. W. Stone wrote:

> I've got to ask-- could you give me an example of a normal or a  
> wide lens that will cover 35mm four perf but not cover a 16mm  
> negative?

An impossibility, as if it covers 35mm, then it will cover 16mm (and  
S-16 as well).

I am at a loss to state which specific optics cover Full 35 (which is  
de-facto for S-35), and which cover Academy (which is de-facto for  
sound) but won't cover Full.

The usual rule is to stop down several stops and then check for  
vignetting.

Alas, 35mm has three different optical centers: Full/Silent/S-35  
(which is also the original CinemaScope, but not the final  
CinemaScope optical center), CinemaScope 2.55 4-track mag, and  
Academy/Sound (which is also CinemaScope 2.35 optical or 4-track mag/ 
optical).

I have a Mitchell BNC movement with a 2.55:1 aperture ... truly an  
anacronism ... and also a Mitchell NC movement with a Full/Silent  
aperture ... very usable.

As most know, a BNC is simply an NC camera head in a self-blimped  
housing