technic Offline Upload & Sell: Off
|
Jeff Nolten wrote:
Technic: So I have 15-85, G1X v1, and have had several 18-55s. In several comparisons of my G1X with the 15-85 mounted on an XXD, pixel peeping the horizontal edges (and central parts) showed equal sharpness between the two. The 15-85 pulled ahead in sharpness towards the long end of the G1X' range. Direct comparisons of my G1X with my 24-105 mounted on an original 5D (same horizontal pixel count) showed the G1X nearly equal in sharpness at the wider ends. The 5D of course had better noise characteristics and a bit better color. Generally the 24-105 on FF has a bit better overall IQ than the 15-85 on my APS-C bodies. The 18-55s have never been very sharp at the edges by comparison....Show more →
The 15mm end is indeed the weakest part of the 15-85, it's very sharp at the long end (which I hardly use ...). The M 15-45 seems to be a relatively low quality lens, G1X3 lens should be way better given the price. My experience with the 18-55IS is that its corner sharpness at WA wasn't any worse than 15-85 when focused correctly, but it had severe frontfocus issues in the WA range that can destroy all detail when relying on PDAF. The main problem with the 18-55IS was the general lack of sharpness at 45-55mm, the newer STM version seems to be better at the long end.
I have compared the 15-85IS on 450D with original 24-105L on 5D years ago and found the 15-85 clearly better at the WA end, the 24-105 had naughty CA and worse corner sharpness for infinity scenes and I found the 15-85 sharper at the top end of the zoom range as well. Probably both zooms have lots of sample variation though.
Optics seems the main problem when making compact, high quality cameras (with sufficient zoom range etc.). Most quality compacts are compromised due to the lens (nowadays often relatively bright but with some obvious flaws like bad corner sharpness due to 'corner stretching', coma near wide open, decentering issues or too much sample variation); and some are compromised because of a good but relatively big/slow lens ;-(
|