02-11-2012, 05:41 AM
[quote name='joachim' timestamp='1328914839' post='15790']
That is a bit disappointing. Looking at [url="http://panasonic.net/avc/lumix/systemcamera/gms/lens/img/g_x_vario_45_175/mtf.gif"]http://panasonic.net..._45_175/mtf.gif[/url] with the Panasonic provided MTF (only 40 lpmm <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/ohmy.gif' class='bbc_emoticon' alt=':o' /> ) I am sometimes wondering whether imatest needs to upgrade their procedure for radial and tangential structures. Not that uncommon for them to be quite different.
J.
[/quote]
Why ? The two values are averaged during the testing procedure. This is a perfectly valid approach.
That is a bit disappointing. Looking at [url="http://panasonic.net/avc/lumix/systemcamera/gms/lens/img/g_x_vario_45_175/mtf.gif"]http://panasonic.net..._45_175/mtf.gif[/url] with the Panasonic provided MTF (only 40 lpmm <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/ohmy.gif' class='bbc_emoticon' alt=':o' /> ) I am sometimes wondering whether imatest needs to upgrade their procedure for radial and tangential structures. Not that uncommon for them to be quite different.
J.
[/quote]
Why ? The two values are averaged during the testing procedure. This is a perfectly valid approach.