That works on the P series with asymmetrical rear tilt, but it doesn't work with the f1 and f2 that have standard base tilts. Sinar figured out a way to utilize the marked lines on the ground glass for the P series, to make them useful for the f series, but using entirely different methodology. That's what I'm trying to point out here. The same basic principle that Sinar uses for the f series can be modified to be used on other view cameras with any tilting design. It's just a novel approach that others my find interesting, but it isn't better than other methods, just different.
You seem to be misunderstanding the purpose of the asymmetrical rear tilt. It was designed to be a convenience in some shooting situations, primarily in commercial tabletop work, where time is money. If you read through the Sinar instructions for the asymmetrical rear tilt, it says to transfer the tilt angle at the back to the front standard, so that you don't disturb the image perspective. It's a bad habit to be using the rear asymmetrical tilt to adjust the focusing plane for every shot. Yes, it can be used this way in some situations without causing problems, but using this for every shot and not understanding it's limitations is poor practise.
There's a pretty good explanation of view camera use and setup here on this site by QT Luong.
https://www.largeformatphotography.i...o-operate.html I'd suggest reviewing that, especially regarding the subsections on perspective and focusing.
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