LINKS https://advancedphototech.wordpress.com/lenses/mirror-mirror-a-guide-to-choosing-and-using-mirror-lenses/ https://advancedphototech.wordpress.com/mirror-mirror-a-guide-to-choosing-and-using-mirror-lenses-part-two/ https://www.dpreview.com/forums/thread/4471710 Related posts:Nikon Lens History by Ken Rockwell (YouTube)NIKKOR - The Thousand and One NightsExtended User Guide for Irix 11mm f/4 and 15mm f/2.4. By IRIX Lens 2022-10-06