3 ms·
We tried this, watched all the how-to videos, etc. I just couldn't take a reproducible measurement. We tried maybe 6-8 measurement attempts, and the results wer
by rabboRubble 9y ago
We tried this, watched all the how-to videos, etc. I just couldn't take a reproducible measurement. We tried maybe 6-8 measurement attempts, and the results were all different.
At this point, I gave up. Of course I was doing something wrong. Without a repeated measurement I didn't have confidence to base an expensive purchase on my work.
- walterbell 9y agoIf you try taking a PD measurement at multiple brick & mortar stores, you may be surprised at the variation. Prior thread: https://news.ycombinator.com/item?id=15154066 https://news.ycombinator.com/item?id=15154066
- dorfsmay 9y agoThree factors play in: - where the subject is looking. Make sure they are looking at leat 4 or 5 meters out, not at you taking the picture! Your pupils get slightly closer and further depending where you look - where the ruler is. Make sure it is at the same level as your eyes, in terms of distance from the back/front of your head. Make sure the ruler is as close to 90 degrees to the nose as possible, as parallel to the eyes as possible - make sure the camera is as parallel to the ruler as possible Also I find printing out one of the pic (just b&w on a regular laser printer) can be easier to measure, as opposed to do it on a screen.