All Forum Comments
Comment by JohnX posted on Lens calibration - Focus Tune software at 27/04/2013 - 11:28
Seems a lot of work..... several shots at each ADJ
value It's cheap though at £20.
I wish I knew the algorithmn they are using. It could be
largest file size, but unlikely and it isn't that
accurate.
There is a fully auto program (UK made) for Canon, been
out some time. link The software is able to control the camera
'
A single shot per adjustment is no good on it's own due to 'normal' af drift. Take a number of shots of the same thing with no changes and af will vary slightly every shot anyway, hence their method where the software averages the variations and rejects the outliers.
As to FoCal, doesn't include Pentax
Comment by JohnX posted on Lens calibration - Focus Tune software at 27/04/2013 - 11:01
Seeing the recent spate of posts regarding AF fine tuning, anyone seen/used this software?
Essentially, (and this appears to be just one of it's functions), you take a series of shots of a standard test target at different AF adjustments and use the software to determine the optimum adjustment.
Takes the subjective out of the equation.
From the Lens Align people; works stand-alone.link
Comment by JohnX posted on Lens calibration - Focus Tune software at 27/04/2013 - 10:58
Comment by JohnX posted on Hi all and ??? at 27/04/2013 - 09:42
Essentially, (and this appears to be just one of it's functions), you take a series of shots of a standard test target at different AF adjustments and use the software to determine the optimum adjustment.
Takes the subjective out of the equation.
From the Lens Align people; works stand-alone.link
Comment by JohnX posted on Lens calibration - Focus Tune software at 27/04/2013 - 09:38
Comment by JohnX posted on AF Calibration charts at 26/04/2013 - 17:37
Comment by JohnX posted on K5II - centre focus point - AF at f2.8 - What? at 26/04/2013 - 17:19
I understand f2.8 in relation to lenses, but not an AF system.
Surely it's the lens maximum aperture that is responsible for the amount of light 'seen' by the AF system and that would be the same regardless of the camera/AF system.
Comment by JohnX posted on K5II - centre focus point - AF at f2.8 - What? at 26/04/2013 - 15:59
This morning I saw another post where the OP was looking forward to a firmware upgrade enabling his Canikon to focus at f8.
I'm still not at all clear though why/how this works, especially as Pentax say AF at f2.8 is an improvement (this from the original specs for the K5II). On the basis that AF gets more difficult/impossible at smaller F numbers, surely then the converse is true, so why shout about 'improving' AF points so that they work at f2.8? They do anyway, don't they?
Comment by JohnX posted on K5II - centre focus point - AF at f2.8 - What? at 25/04/2013 - 19:02
Comment by JohnX posted on K5II - centre focus point - AF at f2.8 - What? at 25/04/2013 - 13:38
That does seem like a lot of work and I'm not sure you'd end up with a different result than if you'd used a page of newsprint or a cornflake box, especially if it has a word search puzzle on the back.
I'm sure that program was written by a former civil servant! Having to take shots in quadruplicate, then repeat the process even though the graph makes it obvious where the optimum is.
Perhaps OK if you have nothing else to do!
John K
At the end of it, however, if you're happy with your shots, however you arrived at them, that's all that counts.
I think I'm just persuading myself to buy the software.