----- Original Message ----- From: andre Subject: RE: Cosina 20/3.8
> > Low contrast subjects are common in real life and can probably better > distinguish the good lenses from the bad ones. Am I right? Lens makers like to test their lenses with a TOC of 1000:1. This is the equivalent of a knife edge, with black on one side, and white on the other. Any lens (or film) will give excellent resolution numbers with this sort of test. In the real world, a TOC of 6:1 is more the norm. And yes, you are correct. William Robb - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
