I recently purchased an eBay microscope with this objective attached. It was not parfocal with the rest of the objectives, so I set up an experiment to find out about the characteristics:
just less than 1mm FOV, so probably 20X
approx 30mm working distance
seems distortion free on an Eclipse 200 infinity microscope
I'm wondering what the possibility is that this is a Mitutoyo Plan Apo 20X?
I know there are other Mitutoyo clones, and the WD is not 20mm like I see on eBay, so I'm a bit perplexed.
Would this objective have any use in a macrophotography application?