Dante_Stella
Rex canum cattorumque
So as I recalled, when I had one of these adapters before, lenses would hit infinity focus just before the infinity mark.
So I read some accounts of other people's experience, some of which were the same and some different.
My second copy of this adapter again back-focused when the lens was set to its hard infinity stop (and I repeated this with many lenses). I pulled out a micrometer to see what the difference in lens extension is between the infinity marking and actual infinity focus. It looks like it's almost exactly 0.1mm, which seems like quite a lot (0.04 is where focus starts to be off). And measuring the adapter, it at least seems to be exactly the right size (10.1mm) to make up the difference between Fuji register (17.7mm) and at least one Leica register (27.8).
Is the real issue that Fuji used the wrong Leica dimension (using 27.8 front film rail instead of 27.95 expected image plane)?
I have an X-Pro1 - has this worked better with the X-T1?
Thanks,
Dante
So I read some accounts of other people's experience, some of which were the same and some different.
My second copy of this adapter again back-focused when the lens was set to its hard infinity stop (and I repeated this with many lenses). I pulled out a micrometer to see what the difference in lens extension is between the infinity marking and actual infinity focus. It looks like it's almost exactly 0.1mm, which seems like quite a lot (0.04 is where focus starts to be off). And measuring the adapter, it at least seems to be exactly the right size (10.1mm) to make up the difference between Fuji register (17.7mm) and at least one Leica register (27.8).
Is the real issue that Fuji used the wrong Leica dimension (using 27.8 front film rail instead of 27.95 expected image plane)?
I have an X-Pro1 - has this worked better with the X-T1?
Thanks,
Dante
JohnL
Very confused
If I have understood correctly, this means that accurate infinity focus on your kit is a little before the maximum far focus on the lens(es) tested? I wonder how the same lens(es) behave on an actual M-mount camera? I used to find that several lenses would run a tad past accurate infinity focus before they hit the hard stop. Perhaps Fuji has left a tiny bit of wiggle room in their lens-flange distance? Or have I understood this all backwards? On my XP1 I have found the infinity focus is just about exact with the Fuji M-adapter, so far as I could tell. I tested it with CV 50/1.1 and 90/3.5, both wide open.
Philip Whiteman
Well-known
For what it's worth, mine just worked fine out of the box with 50 and 90mm Summicrons
Kwesi
Well-known
Are you saying you are able to hit infinity focus and are able to accurately scale focus?