Groupcaptainbonzo
TPF Noob!
IR focuses at a slightly different possition to visible. As such lenses used to include a small red dot. or letter Rslightly to the right of the focus line.
I have not seen this mark on many modern lenses. I ASSUME (First rule of life is to assume NOTHING) that with the newer technologies available and apo lenses . Maybe these are no longer necessary. It is only a slight difference and with a wider (24 to 35mm ) Lens and a small aperture (f22 or so). it wasn't needed any way.
I have not seen this mark on many modern lenses. I ASSUME (First rule of life is to assume NOTHING) that with the newer technologies available and apo lenses . Maybe these are no longer necessary. It is only a slight difference and with a wider (24 to 35mm ) Lens and a small aperture (f22 or so). it wasn't needed any way.