I'm Roger and I am the founder of Lensrentals.com. Hailed as one of the optic nerds here, I enjoy shooting collimated light through 30X microscope objectives in my spare time. When I do take real pictures I like using something different: a Medium format, or Pentax K1, or a Sony RX1R.
Lenses and Optics
Well before our Imagemaster optical bench was delivered, I knew what I wanted to do first: compare some Leica lenses with the best SLR lenses on a level playing. I did one comparison involving Leica lenses a long time ago, but Leica lenses are difficult to test in our Imatest lab. It’s nothing to do with Imatest or the lenses; simply […]
Technical Discussions
OK, when I introduced our new optical bench, I mentioned that it generates a lot of data. We gathered data for a nice comparison test (I mean who wouldn’t want to know how the Zeiss Otus and Sigma 50mm f/1.4 Art stack up against some nice Leica 50mm lenses). Since then I’ve spent about 20 […]
Other
Note: This is a Geek article. If you aren’t into geeky stuff, you won’t be into this. “We take a step back so that we may leap further.” African proverb I wrote a post a couple of weeks ago about our first copies of the Sigma 50mm Art lens, and promised to follow up when […]
Lenses and Optics
This post contains absolutely no mathematics. Explaining MTF without math is sort of like doing a high-wire act without a net. It’s dangerous, but for any number of reasons is more likely to keep the audience interested. Why Am I Doing This Again? I wrote an article on reading MTF charts several years ago. It […]
Other
I suspect I’ll never be on any manufacturer’s “early review copy” list for new lenses. There are already plenty of good early lab reviews on the eagerly awaited Sigma 50mm f/1.4 Art lens at SLRGear, Lenstip, and DPReview, among others. So when we received our first Sigma 50 f/1.4 Art lenses for rental stock I […]
