The answer is pretty easy ... the various Royal models and Royal 'clones' with other brand names that I have come with three lenses. 1:3.5 ƒ=45mm 1:2.8 ƒ=45mm 1:1.9 ƒ=45mm.
The earliest had 1:3.5. Later there were choices as far as I can see - the Tomioka company making two lenses for Royal - the Tominor 2.8 and the Tominon 1.9. As for quality, I cannot see any real difference in results, but my research suggests Tominor=YashikOR and Tominon=YasikiNON. Other 'brands' of Royal, seeking lowest retail prices, often went with 3,5 and 2,8.
Hope this helps.
igor
15-Oct-2011 18:05
Hey, why do I keep seeing f2.8 lenses on these at websites? Mine has an f1.9
I wish it was for the rangefinder. ;-). No, it's not the rangefinder.
As I wrote to Jean-Luc, it is the same null adjustment that I have on the Weston Master and Euro-Master light meters. It actually zeroes (calibrates) the meter-reading needle - if you need to recheck after a jolt/bump, or after some time unused. Thanks for the note.
classicamerabits
17-Feb-2010 11:54
I think the screw with the 2 arrows is for adjusting the rangefinder at infinty.
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