That's very kind of you Dave and would look forward to it...Pinot Grigio is just fine! The question is how much will my photography be improved after a glass or three
Dave with regards to AF fine tuning a lens with the 645D, sometimes it's made a small degree of difference while at other times it's been substantial. It greatly depends on not only on the particular focal length length or type of lens being used, but more often on how well (or not so well) the lens was calibrated when it left the Pentax factory during the film era days. Both variables are important.
For example, I was testing two samples of a 300 f5.6 lens on the 645D (after I posted my comprehensive lens testing) where one sample barely needed a +1 setting, while the other 300 f5.6 needed a +9 AF fine tune setting, just to get in the same ballpark in terms of performance as the 1st sample. These differences between the two lenses of course was most readily seen when identical files from both lenses were examined at 100% on the computer monitor.
Maybe what would be both fun and instructional to start with is to take for example your FA 400 5.6 set up on a tripod and focus on a stationary subject at mid-distance and take three shots. One with AF fine tuning set to -10, one shot with it set to zero and a third shot set to +10 and then go back and examine all three files at 100% (actual pixels) and determine if you observe any differences in terms of sharpness of the test subject you focused on.
Dave (D&A)
Dave with regards to AF fine tuning a lens with the 645D, sometimes it's made a small degree of difference while at other times it's been substantial. It greatly depends on not only on the particular focal length length or type of lens being used, but more often on how well (or not so well) the lens was calibrated when it left the Pentax factory during the film era days. Both variables are important.
For example, I was testing two samples of a 300 f5.6 lens on the 645D (after I posted my comprehensive lens testing) where one sample barely needed a +1 setting, while the other 300 f5.6 needed a +9 AF fine tune setting, just to get in the same ballpark in terms of performance as the 1st sample. These differences between the two lenses of course was most readily seen when identical files from both lenses were examined at 100% on the computer monitor.
Maybe what would be both fun and instructional to start with is to take for example your FA 400 5.6 set up on a tripod and focus on a stationary subject at mid-distance and take three shots. One with AF fine tuning set to -10, one shot with it set to zero and a third shot set to +10 and then go back and examine all three files at 100% (actual pixels) and determine if you observe any differences in terms of sharpness of the test subject you focused on.
Dave (D&A)