Lou Jost wrote:This really would be an excellent idea. Why don't we act on it? Find one with really fine detail (preferably with those nice resolution test patterns on it) and either buy dupes and sell to others on the forum to recover costs, or cut one into pieces with a glass cutter and send the pieces to others.would actually nice to have identical wafers spread out over forum members so that tests could be done to compare lenses across continents
Robert, I'd love to split or buy a duplicate wafer with you. Do you have duplicates of one with a fine test pattern? Or could you choose a source for a given known-good type which has multiple copies, so we could all buy one?
I'm in if we find some at reasonable prices (the larger ones seem to have gotten quite expensive).
So far I could only find sources which send random copies and those I got are not really fine enough to judge things like moire.
maybe we could use some small ones, not so good to judge flat field, but easier to find in large quantities, cheaper and also better for shipping.
I got a set of these:
https://www.ebay.de/itm/100pcs-Toshiba- ... 3743175642
they are quite small (2.5x2.5mm) but seem to have a good structure. will make a test tomorrow to see if they would qualify.