06-01-2011, 10:44 AM
[quote name='Brightcolours' timestamp='1306922892' post='8976']
That is not based on much <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/wink.gif' class='bbc_emoticon' alt='
' />....
You can get great results with a bargain basement Tokina 19-35mm.
While you do get more barrel distortion, usually, on FF, you get a higher resolution too with the current sensors, and so the distortion correction resolution hit will not be that severe.
And on vignetting/light fall off, you can't combat that with higher quality UWA's, as it is sensor related.
FF will give better "dynamic" (not dynamic range, but dynamic feel) quality anyway....
[/quote]
A bigger image circle compared to the one on cropped sensor, has it's price I think. Why when some UWA zooms are huge and bulb-like when some others are rather small? The glasses used should better be larger for FF (retro focus design and light transmission), and these larger glasses must be produced with higher precision to avoid problems concerning spherical aberrations. Thus the higher quality and price for FF compatible UWA lenses. That said, I agree that there are affordable lenses (like the one you've mentioned) but FF is something that people usually choose for portrait or wide angle. And I personally don't think that the strong point of FF should be wasted by using a low grade lens.
Vignetting (not the mechanical one) is in general sensor related: edges must get more amount of photons in a perpendicular angle. The latter is what you've mentioned, but the amount of light depends on the design of the lens.
That is not based on much <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/wink.gif' class='bbc_emoticon' alt='
' />....You can get great results with a bargain basement Tokina 19-35mm.
While you do get more barrel distortion, usually, on FF, you get a higher resolution too with the current sensors, and so the distortion correction resolution hit will not be that severe.
And on vignetting/light fall off, you can't combat that with higher quality UWA's, as it is sensor related.
FF will give better "dynamic" (not dynamic range, but dynamic feel) quality anyway....
[/quote]
A bigger image circle compared to the one on cropped sensor, has it's price I think. Why when some UWA zooms are huge and bulb-like when some others are rather small? The glasses used should better be larger for FF (retro focus design and light transmission), and these larger glasses must be produced with higher precision to avoid problems concerning spherical aberrations. Thus the higher quality and price for FF compatible UWA lenses. That said, I agree that there are affordable lenses (like the one you've mentioned) but FF is something that people usually choose for portrait or wide angle. And I personally don't think that the strong point of FF should be wasted by using a low grade lens.
Vignetting (not the mechanical one) is in general sensor related: edges must get more amount of photons in a perpendicular angle. The latter is what you've mentioned, but the amount of light depends on the design of the lens.