I suppose if one was apprehensive about the focus thing, he might invest a day shooting without a RF with several lenses already in the stable and see how it goes.
I did shoot a roll with my Leica 1 and left the RF home, but when I first shot 35mm format I did not have a RF, light meter or interchangeable lenses. Shooting for a paper down the line a bit with SLR's I would scale focus in fast moving situations.
I know, I was also walking ten miles to school in the snow up hill both ways and I did not have an ipod..... ;-) Now, if I forget my cell I go back home to get it, and use my GPS to find places a half mile away.
I have the 12 and 15mm, figuring if I need the speed I will swap the 15 for the 12, and I use the finder from the 15 for the 12 on the M8, so far so good.
I bought the 12 first, shooting film, and found too many situations I did not feel comfortable with lower light, I think the 15 came with some other kit at a too good to pass price.
I am pretty likely to have at least one LTM - M adapter handy, I tend to leave one on both lenses. Adapters seem to come along, though I have not tried the $15 Chinese models yet, they are common enough it is hardly a concern.
I suppose it ends up possibly being a "need" and/ or "want" situation. I am guessing you really cannot go wrong, but I have not put the 12mm on my Leica Standard. ;-)
Regards, John
