08-11-2010, 02:54 PM
[quote name='wim' timestamp='1281514588' post='1667']
The latter I think purely because the 50 is an F/2 to start with, has a relatively narrow AoV, and is not a retrofocus lens...
[/quote]
Not sure how narrow AOV can make things worse. Narrow AOV means the lens is long and therefore the nodal point of the lens is further away from the sensor and doesn't this mean the light hits fairly straight-on (just like in the case with long APS-C lenses being usable on FF than wide APS-C lenses?)
Similarly for the aperture, I think a large aperture lens would have less issues than a small aperture lens because the light doesn't have to bend as much? The only problem would be mechanical vignetting from the rear because the exit pupil won't be a perfect circle when viewed from the far corners.
[quote name='wim' timestamp='1281514588' post='1667']
BTW, looks like 16-9.net had an exceptional 12-24 for testing.... <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/biggrin.gif' class='bbc_emoticon' alt='
' />
[/quote]
Actually, I've seen exceptionally good performance from that lens... unfortunately the zoom misalignments and sample variations put people off too much. Otherwise, its distortion free and the CA is very very low.
The latter I think purely because the 50 is an F/2 to start with, has a relatively narrow AoV, and is not a retrofocus lens...
[/quote]
Not sure how narrow AOV can make things worse. Narrow AOV means the lens is long and therefore the nodal point of the lens is further away from the sensor and doesn't this mean the light hits fairly straight-on (just like in the case with long APS-C lenses being usable on FF than wide APS-C lenses?)
Similarly for the aperture, I think a large aperture lens would have less issues than a small aperture lens because the light doesn't have to bend as much? The only problem would be mechanical vignetting from the rear because the exit pupil won't be a perfect circle when viewed from the far corners.
[quote name='wim' timestamp='1281514588' post='1667']
BTW, looks like 16-9.net had an exceptional 12-24 for testing.... <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/biggrin.gif' class='bbc_emoticon' alt='
' />[/quote]
Actually, I've seen exceptionally good performance from that lens... unfortunately the zoom misalignments and sample variations put people off too much. Otherwise, its distortion free and the CA is very very low.