02-28-2017, 03:08 PM
Okay, why not join the betting? I would like to mention that Zeiss sometimes uses odd FL (like 25 mm, 100 mm, 180 mm) but rarely - if at all - odd apertures. So my guess is rather f/2.8 or f/2.0, but not f/2.4 or 2.5 ^_^