10-10-2012, 09:57 AM
[quote name='AlexanderE' timestamp='1349775798' post='20546']
But I've written that already. I have checked with live view, it doesn't get sharper. And, even if my focus scale seem to be placed correctly (as it stops in both ends where the scale stops), should I still ignore it? I Have to check it with a measuring tape.
[/quote]
Yes, if the focus scale is not right, it does not matter if it stops at both ends, because the ends are wrong, if the focus scale is adjusted wrong. The scale (i.e. the distance between the numbers) is correct, however, how the scale matches the actual distance could be wrong depending on how the lens is adjusted when it was assembled.
Here is information for example how it affected my Samyang 8mm fish-eye, and how it could be corrected: http://photonius.wikispaces.com/Fish-eye...+Stitching
Since you seem to have an issue with focusing even in liveview (on my canon it seems to work quite ok with 10x), I recommend you set the camera on a tripod, measure an object say at 3 meters or 5 meters (e.g. newspaper), and just shoot through the whole distance scale. Later, on the computer you choose the best image, and you should know at what setting you shot it, and then you will see if it is off or not.
So, having said that, the first three pictures (which I presume are f2.8, f4 etc.) don't look too far off. If you look at the church tower, it's not too bad, but as you say, it's obviously softer at f2.8. Well, first check how far off your focus scale is. If it is off, redo the shots with estimated corrected distance (you can take a series of shots, with slight changed focus each time).
Perhaps there is also an issue with the lens, it does look a bit softer on the right side, perhaps some decentering, which may affect general sharpness as well?
But I've written that already. I have checked with live view, it doesn't get sharper. And, even if my focus scale seem to be placed correctly (as it stops in both ends where the scale stops), should I still ignore it? I Have to check it with a measuring tape.
[/quote]
Yes, if the focus scale is not right, it does not matter if it stops at both ends, because the ends are wrong, if the focus scale is adjusted wrong. The scale (i.e. the distance between the numbers) is correct, however, how the scale matches the actual distance could be wrong depending on how the lens is adjusted when it was assembled.
Here is information for example how it affected my Samyang 8mm fish-eye, and how it could be corrected: http://photonius.wikispaces.com/Fish-eye...+Stitching
Since you seem to have an issue with focusing even in liveview (on my canon it seems to work quite ok with 10x), I recommend you set the camera on a tripod, measure an object say at 3 meters or 5 meters (e.g. newspaper), and just shoot through the whole distance scale. Later, on the computer you choose the best image, and you should know at what setting you shot it, and then you will see if it is off or not.
So, having said that, the first three pictures (which I presume are f2.8, f4 etc.) don't look too far off. If you look at the church tower, it's not too bad, but as you say, it's obviously softer at f2.8. Well, first check how far off your focus scale is. If it is off, redo the shots with estimated corrected distance (you can take a series of shots, with slight changed focus each time).
Perhaps there is also an issue with the lens, it does look a bit softer on the right side, perhaps some decentering, which may affect general sharpness as well?