In the previous post I looked at lots of ways to display histograms. In this one, I’m going to take a scene with normal outdoor contrast, and look at the relevant histograms. Here’s the scene, as captured by a Hasselblad X2D with a 90 mm XCD lens, at close to ETTR (more on that later),… [Read More]

Around the turn of the 20th century, Karl Pearson, an English mathematician and statistician, invented the histogram as a way of presenting data. Originally, the histogram was a kind of bar chart, with the x-axis divided into intervals — now called buckets or bins — and a bar for each bin indicating how many items… [Read More]

The Swebo TC-1 is a nice piece of kit, but the rail and bellows only accommodate about 190 mm of flange focal distance. I can focus the Digaron HR 180mm lens from infinity to a few meters, but I can’t use longer lenses even at infinity, and I can’t get the bellows draw necessary for… [Read More]

720nm IR-modded GFX 50R on the back of a Swebo TC-1, Rodenstock 180mm f/5.6 HR Digaron on the front of the TC-1, a 950 nm filter on the front of the lens. Edge burned for aesthetic reasons; the lens covers the sensor perfectly, as far as I can tell.