Sigma Cine 85mm T1.5 FF Prime
Just the Cinema Lens MTF Charts: Canon and Sigma
We’re going to continue the Cinema prime MTFs with the Canon and Sigma lenses. Again, we’re not going in any particular order, other than what we have handy and what fits reasonably into a single post. Since these are among our most popular cinema lenses, we do generally have at least a 10-copy set…
Testing Lenses: Finding The Best Average Focus Point
You have been patient, my friends. You have made it through the first article, where we looked at how MTFs improve stopped down and saw it was a bit different for every lens. You enjoyed the second article, where we looked at the Best Individual Focus MTF (BIF MTF) which showed how good the MTF…
Testing Lenses: Best Individual Focus MTF Curves
OK, in the last post we did something useful, but rather boring: we looked at how MTF changes when lenses are stopped down. Today we’re going to use a more powerful optical bench tool, the MTF vs. Field vs. Focus. Unless you work in a metrology lab (and probably not even then, very few are…
Testing Lenses: Stopped-Down MTF Curves
For quite a while now we’ve been publishing our MTF curves. They’ve always been the same thing; at least ten copies of each lens, in 4 rotations, and measured at the widest aperture. The reasons for that are (to us) very straightforward. Our purpose in doing the tests is to establish reasonable…
Taking Apart the Sigma Cine 85mm T1.5 FF Lens
We’ve been impressed with the Sigma Cine lenses. We weren’t surprised that they’re generally sharper than classic Cine primes; that’s what we’ve come to expect from Sigma. We were pleasantly surprised by the smoothness of focusing and aperture and the apparent build quality. Since we’d previously…