Proxars and all regular close-up lenses sold by Hoya, Nikon and all main photo brands are meniscus, as opposed to the PCX Optosigmas which are planoconvex elements. As far as we can tell by the testing done here, meniscus doesn’t seems to work nearly as good as planoconvex. Therefore, the consensus in this thread seems to avoid close-up lenses and get the PCXs instead,
I don’t know if the Proxar 0.5m will do better than the 1m. but in all likelihood neither will perform as well as a PCX 1.5m. Besides, with a Proxar 0.5m there’s a fair chance that you won’t be able to reach infinity with the G28. I was able to get infinity with this lens and a Hoya 1m. but not with a Hoya 0.5m.
