02-10-2012, 11:30 AM
[quote name='joachim' timestamp='1328792386' post='15744']
Are you sure this is the lens and not the body? I am actually wondering whether µFT bodies have no precise register. I have an Oly 12/2, the only m.Zuiko with a distance scale. Mine is reasonable accurate on my body, but reading the manual, I got the impression that is not to be relied on. There are reports about lenses being out of spec on the web. Also, the lens can be turned a fair amount past infinity, which makes sure infinity focus can be achieved.
[/quote]
Good point, the inaccuracy (on APS-C, I have Canon) could be anywhere, also in the mount. The distance the lens moves from 0.3 meters to infinity is about 0.5mm,
see http://michel.thoby.free.fr/SAMYANG/Samyang_shaved.jpg
On my lens, when set to infinity, the actual focus was more like 2 meters instead of "infinity", i.e. >10m. Thus, the extension difference from 2 or 3 meters to infinity is a minuscule extension. Any inaccuracies in the focus scale may therefore be also tolerances within the lens mount or the sensor placement. I'll have a look on an older body, and see how it compares.
Are you sure this is the lens and not the body? I am actually wondering whether µFT bodies have no precise register. I have an Oly 12/2, the only m.Zuiko with a distance scale. Mine is reasonable accurate on my body, but reading the manual, I got the impression that is not to be relied on. There are reports about lenses being out of spec on the web. Also, the lens can be turned a fair amount past infinity, which makes sure infinity focus can be achieved.
[/quote]
Good point, the inaccuracy (on APS-C, I have Canon) could be anywhere, also in the mount. The distance the lens moves from 0.3 meters to infinity is about 0.5mm,
see http://michel.thoby.free.fr/SAMYANG/Samyang_shaved.jpg
On my lens, when set to infinity, the actual focus was more like 2 meters instead of "infinity", i.e. >10m. Thus, the extension difference from 2 or 3 meters to infinity is a minuscule extension. Any inaccuracies in the focus scale may therefore be also tolerances within the lens mount or the sensor placement. I'll have a look on an older body, and see how it compares.