Frans van den Bergh

force sequential build of man pages

version bump

Hi Gray-Box, If you are considering manufacturing your own targets, I have found a supplier called Dot-Vision that manufactures custom targets that may be suitable for high magnification. I have not tested their chrome-on-glass targets yet, but I have tested their lithographic ink on glass and lithographic ink on CFRP targets. These targets that I have tested were not intended for macro magnifications, but I am very satisfied with the quality of the targets. For example, with the lithographic ink...

Hi Gray-Box, Thanks for sharing the raw images, they are quite interesting! I agree that the edge quality is not as good as one would hope. I know that solder masks are made using different processes: some are laser cut (likely the worst edge quality), others are etched (likely much better edge quality). Regardless, their intended application probably does not depend on edge quality but rather feature size accuracy. I recommend using the good old razor blade as a reference for a given magnification,...

Hi! I have a slight preference for the lensgrid chart because the edges are better aligned with radial and tangential directions, provided you position the center of our lens on the center of the chart, of course. And the lensgrid has some fine-tuning to try and avoid the worst case edge orientations (like exactly 45 degrees). This is more of a purist thing, though. A lot of people end up combining the radial and tangential measurements anyway. On the other hand, as long as the edges are "mostly...

Just to add to that, the only feature that requires the circular fiducials is the chart orientation estimation feature. The circular features are not needed if you perform your target alignment manually.

Hi Gray-Box, You can focus on using only the trapezoidal features. My recommendation is to use the mtf_generate_test_chart program included with MTF Mapper to produce a suitable .svg file, then use something like Inkscape to simply delete all the circular fiducials. You can even generate your own target design, as long as the edges of your squares (or somewhat trapezoidal shapes) are oriented roughly along the radial and tangential lines. Just test your chart design using a laser printed copy before...