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
The Three Questions I get asked a couple of questions every time I publish a graph showing Imatest results for multiple copies of lenses like the one below. Most people understand that some copy-to-copy variation is inevitable in the manufacturing process. Most are surprised, though, at how large the sample variation seems to be. Heck, […]
Roger's Corner
I’ve been doing a lot of technical things lately, writing up our repair data and investigating methods of reducing optical variation in lenses. So I thought I’d take a bit of a break and write a post about something fun. Human vision is always fun to me, since it’s an area where I can apply […]
Equipment
Correction: Lenses called “Rokinon” in the “Weeks to Failure” rate incorrectly included Bower & Samyang branded products. Because of this error, data for lenses called “Rokinon” lenses has been removed. We apologize for this inaccuracy, and any confusion that may have resulted therefrom. What Is This? We have a unique opportunity: We own a very […]
Teardowns and Disassembly
Every so often I get an email asking me to jump in on some forum argument or other. I rarely do that because of the language barrier. Two of the common languages spoken on forums are CAKWAF (Complete, Absolute Knowledge Without Any Facts) and AFIDAWAB (Any Facts I Don’t Agree With Are Bullstuff). Since I […]
History of Photography
The more I learn about the history of photography, the more I come to realize that just about every important advancement since 1850 has its roots in photography. The 8 hour workday, paid vacations, and employee stock options? A photography manufacturer started them. Telegraph? A photographer invented it. Synthetic cloth was just an offshoots of photographic […]
