01-03-2016, 09:02 PM
Don't tell me about fiddling around... IMO it starts earlier, with finding a quick and precise method to see if it's back- or front focus and then adjust AFMA. I tried LensAlign, lately I'm using more FoCal which is more convenient. In theory, both applications should find the same values - in real life it differs quite a lot. For LensAlign, I'd need a longer ruler, but Michael Tapes was not responding to a request. No ruler, no tele adjustments.
All results for the 150-600 should be taken with huge grains of salt. At first, how to focus 600 mm to infinity? Which kind of target? Most of the time infinity is beyond a huge wall of dust, mist or other things. I've seen the graphs and the spread of the shots. A value of -20 could as well be -12, it depends... The target for closer distances I printed out but the prints have slightly softer edges (in my eyes) than the professionally on plastic printed target of Michael tapes.
Honestly, dave, I do not believe that the Tamron would really be fine with one AFMA for all distances and all focal lengths, but if you get sharp shots with -2, then you get sharp shots
and I have no reason to talk you out of this. If you don't want to get a Sigma Art lens, leave it - there are other fine glasses as well. Those Tamron 35 and 45 are also getting very good reviews.
All results for the 150-600 should be taken with huge grains of salt. At first, how to focus 600 mm to infinity? Which kind of target? Most of the time infinity is beyond a huge wall of dust, mist or other things. I've seen the graphs and the spread of the shots. A value of -20 could as well be -12, it depends... The target for closer distances I printed out but the prints have slightly softer edges (in my eyes) than the professionally on plastic printed target of Michael tapes.
Honestly, dave, I do not believe that the Tamron would really be fine with one AFMA for all distances and all focal lengths, but if you get sharp shots with -2, then you get sharp shots
and I have no reason to talk you out of this. If you don't want to get a Sigma Art lens, leave it - there are other fine glasses as well. Those Tamron 35 and 45 are also getting very good reviews.