11-16-2010, 10:27 AM
[quote name='curriguy' timestamp='1289902020' post='4196']
I notice I end up never finding reviews of newer third party lenses on the Nikon side. I end up turning to the canon section and reading those reviews, and assuming (probably incorrectly) that they'll fare the same on a Nikon camera.
Just curious, why is it easier for the reviewers to do canon reviews? Do you guys just happen to have more access to these lenses?
I'm not complaining because I know you guys do this stuff in your spare time (and I certainly appreciate your opinions) - but I'd just like to understand the inequality. Would it make it easier if more Nikon shooters donated lenses to you for testing?
-Curriguy
[/quote]
Well lenses will not fare the same but compartivly.
Sharpness: The general charcteristic will be the same regardless of whether a lens is used on a Nikon or Canon camera.Eg the differnce between center and border performance will be comaparable. Of course absolute resoulution numers are not the same since differnt sensor produce different absolute mtf curves. However if the resolution of lens A is better than that of lens B on Canon you will know that lens A is also better than lens B on Nikon.
Vignetting. Nikon's APS-C sensor is slightly larger than Canon's, so vignetting is a bit more pronounced in the corners of Nikon Cameras. If you shoot jpg, overal vignetting appears to be stronger with canon,however as canon aplies a steeper tone curve to the image.
CA
is different, because photozone measures it in pixel width. Thus with a more pixel dense sensor, Ca will be larger, the more pixels a sensor has.
Distortion
Should be almost the same. But again, because of the slightly larger dimensions of the Nikon sensor, a lens can distort slightly more on Nikon than on Canon.
Overal, Id say the canon tests provide a very good and reliable guideline to guess a lenses perfomance on a Nikon camera. Just dont start comparing absolute numbers across systems. This is bound to fail and not necessry anyway.
I notice I end up never finding reviews of newer third party lenses on the Nikon side. I end up turning to the canon section and reading those reviews, and assuming (probably incorrectly) that they'll fare the same on a Nikon camera.
Just curious, why is it easier for the reviewers to do canon reviews? Do you guys just happen to have more access to these lenses?
I'm not complaining because I know you guys do this stuff in your spare time (and I certainly appreciate your opinions) - but I'd just like to understand the inequality. Would it make it easier if more Nikon shooters donated lenses to you for testing?
-Curriguy
[/quote]
Well lenses will not fare the same but compartivly.
Sharpness: The general charcteristic will be the same regardless of whether a lens is used on a Nikon or Canon camera.Eg the differnce between center and border performance will be comaparable. Of course absolute resoulution numers are not the same since differnt sensor produce different absolute mtf curves. However if the resolution of lens A is better than that of lens B on Canon you will know that lens A is also better than lens B on Nikon.
Vignetting. Nikon's APS-C sensor is slightly larger than Canon's, so vignetting is a bit more pronounced in the corners of Nikon Cameras. If you shoot jpg, overal vignetting appears to be stronger with canon,however as canon aplies a steeper tone curve to the image.
CA
is different, because photozone measures it in pixel width. Thus with a more pixel dense sensor, Ca will be larger, the more pixels a sensor has.
Distortion
Should be almost the same. But again, because of the slightly larger dimensions of the Nikon sensor, a lens can distort slightly more on Nikon than on Canon.
Overal, Id say the canon tests provide a very good and reliable guideline to guess a lenses perfomance on a Nikon camera. Just dont start comparing absolute numbers across systems. This is bound to fail and not necessry anyway.