There’s a technique on the RawDigger site for determining the unity gain ISO for a camera by using photon noise. The scheme is basically a search over a range of ISO values to find the one where the square root of the average value of a group of similarly-exposed raw values equals the standard deviation… [Read More]
Search Results for: focus accuracy
Scheimpflug for dummies
In making the test images for the previous post, I reacquainted myself with the frustrations of using live view in its present incarnation to adjust tilt angle and focus. What I really want is to be able to see magnified views of two portions of the image of my choosing simultaneously, so I can see… [Read More]
Sony RX-1 review, part 10
I dumped the Leica optical finder for something smaller and supposedly a closer match to the 35mm RX-1 lens focal length. Here’s what it looks like on the camera, with the thumb grip: and: The framing accuracy with the OVF is about as good as the accuracy of any RF camera — Leica M series,… [Read More]
Testing for ETTR, part 16
This is a continuation of analyzing the process variables involved in doing UniWB from an LCD monitor with only Rawdigger and Photoshop as the software tools involved. This post is statistical, technical, and nerdy. It is presented in the spirit of giving the interested reader to tools to replicate what I’m doing. If you’re just… [Read More]
Testing for ETTR, part 15
Half of me would like to drop this in-camera histogram calibration project, since I’ve gotten it to the point where it works better for me than the Guillermo Luijk’s process, and is good enough for my use with iterations on the final step, but I’ve started down this road and I’m not going to quit… [Read More]