4 ms·They don't appear to be commercially available, and some of them seem rather special-purpose.by nknighthb 13y agoThey don't appear to be commercially available, and some of them seem rather special-purpose.jychang 13y agoMost are for XRay imaging.ams6110 13y agoThey don't necessarily do a terrible job at optical imaging though. http://forum.mflenses.com/viewtopic.php?t=50166 http://forum.mflenses.com/viewtopic.php?t=50166RyJones 13y agoAnd one of them is a hoax.