These pictures sure don't have the "wow" factor of John's wonderful ant shot, but they were deliberately shot to look at one specific aspect... chromatic correction. That's why I've placed them here in the "equipment" section. These were all taken at 5X.
The cells in the "Herb Robert" petals were like little glass beads and provided many very bright small highlights (255/255/255) right out to the corners. Any chromatic aberrations would normally be very apparent around these highlights. There were virtually none that were noticeable!
The tiny springs parts were left on a dusty piece of black plastic. I deliberately did not remove the light dust particles. Between the white dust particles and the bright metal highlights on the metal it's usually pretty easy to find some "color". Extraordinarily clean. More impressive to me was when I scrolled through the single images used in the stack at 1:1. Often, it's the out-of-focus frames that show a little green or magenta around the bright highlights but these too were very clean. In one or two spots I could find a very slight red edge, but so slight... very impressive in this regard.
It would be interesting to find out exactly what this was originally made for. It's not often you have such an "unknown" quantity, and thus no preconceived notion of what might be expected. Normally you have some idea of what an optics intended use was.
One thing seems certain... it's very well corrected chromatically!
). I wonder what the image circle of this lens is.
