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.
Equipment
Long ago, a visiting Canon engineer put a box on my workbench, grinned, and said: “You’re going to like this.” Then he pulled out a mock-up of the RF 70-200mm f/2.8 IS lens, and my jaw dropped. I’ve been doing this stuff for a long time. My jaw drops very infrequently. My only comment was, “That’s […]
Lenses and Optics
In my last two posts (1,2), I’ve been using field curvature graphs to look at how lenses behave as you stop them down. It’s been a fairly limited data set; basically 35mm prime lenses and some zooms at 35mm. I’m going to keep going with this topic and today look at a different focal length […]
Geek Articles
In my last post, we looked at how the field curvature of some really excellent 35mm f/1.4 primes affected what happens when we stop down the lens. The takeaway message is that as you stop down, things change a bit differently with the different lenses, but by f/5.6 they were similar. Still slightly different, but […]
Geek Articles
Someone remarked the other day that sometimes our equipment gets used in the recording of the various “Find the Ghost” or Check-Out-This-Haunted house TV shows. Someone else became concerned that if our gear was exposed like this, maybe some of it came back haunted or contaminated by malevolent spirits. Aaron and I, since we develop all the […]
Geek Articles
Warning: This is a somewhat Geeky article. It has some real points that are useful for anyone who uses lenses, though, so I’ve tried to keep it mostly in English. In imaging, there are a lot of topics where people over-generalize; there’s a general tendency for something to happen, but people become convinced that the […]
