*ist D Program Lines
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Posted 20/07/2004 - 09:12
Modulation transfer function.
This only works (I believe) with F and FA lenses, which are able to tell the computer what they are. From this information, the camera works out the optimum setttings for aperture and shutter speed, so that if the lens is particularly good or bad at a particular aperture, the camera will try to select/avoid that setting.
I suspect that many people never use it.
If you want to see a really bad manual, buy a Minolta!
This only works (I believe) with F and FA lenses, which are able to tell the computer what they are. From this information, the camera works out the optimum setttings for aperture and shutter speed, so that if the lens is particularly good or bad at a particular aperture, the camera will try to select/avoid that setting.
I suspect that many people never use it.
If you want to see a really bad manual, buy a Minolta!
Link
Posted 20/07/2004 - 10:09
George is correct. The MTF mode uses information from the lens, and uses the aperture at which the lens is sharpest. And yes, it needs an F, FA, or DA lens to be able to read it back (the lenses with the electronic contacts). The MTF also changes according to a zoom's focal length, and the MTF mode will handle this too.
I often use MTF if I am doing landscapes, or where there's an image of high detail.
Matt
http://www.mattmatic.co.uk
(For gallery, tips and links)
I often use MTF if I am doing landscapes, or where there's an image of high detail.
Matt
http://www.mattmatic.co.uk
(For gallery, tips and links)
Link
Posted 20/07/2004 - 12:16
Sorry, forgot the DA lenses, and of course the FAJ. Basically, any Pentax auto-focus lens will "do" MTF.
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davecv
Member
Pottstown PA USA
What do the other modes do? The charts are greek to me.
The Operating Manual is terrible! It's almost as bad as the Z-LX Manual but not quite. I love Pentax equipment but they really need to spend some time / money / effort into writing documentation! For an intermediate user (like myself) they need to simplfy.
Sorry for the rant, just venting.