Dante_Stella
Rex canum cattorumque
I just received one of these Fuji adapters this morning. My lenses are all in good trim, having been collimated against neutral references and validated on an M8 for correct focus.
One thing that is apparent is that on the copy of the adapter I have, the register distance is shorter than 27.95mm - and the way I figured this out is that a 21/3.4 hits infinity at the 10m mark, the 35/1.4 hits at between 10m and ∞, and the 90/2.8 hits at ∞ (my target is a mile away, so it is very easy). Given the relative focal lengths, this seems to point to a constant error that has to be coming from the adapter.
It would not be surprising to me if the adapter were designed that way - just as many cheaper adapters err on the side of being thinner to allow all lenses to focus to infinity. Otherwise, faster lenses with focus shift (whose normal tendency is to front-focus wide-open), particularly telephotos (whose shift is worst), would not reach infinity by the time the lens reached its hard stop.
Has anyone with a 21/2.8 or 35/1.4 lens tested the Fuji adapter for infinity focus? I suspect that the type of error I am seeing would not be visible on an f/4.5 lens due to the greater depth of focus (and in my testing, it also tends to disappear by stopping down to about there). And in the real world, it's not an error that is going to make much difference to zone-focusing wideangles (because lens extension changes are much larger at close range) or EVF-ing longer ones (since you're TTL anyway).
But I do want to make sure I am not dealing with an abnormal sample of this adapter.
Thanks
Dante
One thing that is apparent is that on the copy of the adapter I have, the register distance is shorter than 27.95mm - and the way I figured this out is that a 21/3.4 hits infinity at the 10m mark, the 35/1.4 hits at between 10m and ∞, and the 90/2.8 hits at ∞ (my target is a mile away, so it is very easy). Given the relative focal lengths, this seems to point to a constant error that has to be coming from the adapter.
It would not be surprising to me if the adapter were designed that way - just as many cheaper adapters err on the side of being thinner to allow all lenses to focus to infinity. Otherwise, faster lenses with focus shift (whose normal tendency is to front-focus wide-open), particularly telephotos (whose shift is worst), would not reach infinity by the time the lens reached its hard stop.
Has anyone with a 21/2.8 or 35/1.4 lens tested the Fuji adapter for infinity focus? I suspect that the type of error I am seeing would not be visible on an f/4.5 lens due to the greater depth of focus (and in my testing, it also tends to disappear by stopping down to about there). And in the real world, it's not an error that is going to make much difference to zone-focusing wideangles (because lens extension changes are much larger at close range) or EVF-ing longer ones (since you're TTL anyway).
But I do want to make sure I am not dealing with an abnormal sample of this adapter.
Thanks
Dante
