Optical measuring experiment.

[Toolmaker51]

re: PJ's comparator reticules

Years ago I bought this SPI kit for the drill machine operators and the 5 reticules it came with had every thing necessary to QA samples from the machine. When developing the drill machines I had access to a 48" Mitutoyo CMM for dialing in the angles and profiles and that was the cats meow, but the idea of creating reticules/graticule's for this optical system seems doable. If not through transparent Gifs or tiffs possibly through purchasable glass ones (although not cheap n' cheerful) like above, mounted external of the camera lens. The diameter of that camera is pretty small (12mm) though for store bought. Typically they are from 16mm up and pricey.

Correct glass screens cost; with limitations of usability. What I recall is most are sized for certain magnification housings [6 to 72 inches], are unmarked and not clear but frosted. I'll suggest the plastic overlay charts. Far lower cost and marked with standard scales for diameter, linear distance, angularity, thread forms. At the federal plant, they made specials on site with a FINE penned plotter, or even manually with what amounted to a backlit drafting table. Pens were just like Koh-I-Noors, a small vertical microscope that stood on a base [IIRC 100x] and he drew them. They were drawn full magnification size, had comparators from 20 to 50 power.

Here is one of such suppliers, I'm not familiar with them. I have a 12" Micro-Vue desk comparator, and a lot of charts came with it from auction. Gauging my win, pricing this size didn't seem prohibitive. I've seen them on you-know-whobay too. Playing with Microsoft Paint, and using pixel-oriented coordinates, they can be printed DIY on clear plastic sheets ala office supply stores.
Plenty cheep 'n cheerful.
Unlike Zeiss CMM's, optical comparators, multi-sensor systems and metrology software the web monitoring program of this page hypes in advertisement. Lol.

PS. I think reticle/ reticule applies to a marked glass, [ie combining the glass and chart] and what Olderdan and PJ's seek may be the overlay, aka chart.