p.3 #1 · The sharpest autofocus SLR lens ever is a Sigma?
just goes to show sharpness aint everything, plus the sigma is still yellow.
Oct 31, 2012 at 06:01 AM
jim allison Offline • • • [X]
p.3 #2 · The sharpest autofocus SLR lens ever is a Sigma?
It really depends on what day of the week you measure the Sigma's focus, then try it again 3 days latter and it might not focus at all.In MHO Sigma makes junk. I'm not trying to start anything! If you love Sigma, be happy and enjoy! I wouldn't be caught dead with one. For me,
Tamron and Tokina are fine but the Sigma brand is unreliable and poorly constructed. I'm sure that there are exceptions but the point is that they are exceptions and not the rule.One more thing, they depreciate more and faster then any other of the major brands.
p.3 #3 · The sharpest autofocus SLR lens ever is a Sigma?
jim allison wrote:
It really depends on what day of the week you measure the Sigma's focus, then try it again 3 days latter and it might not focus at all.In MHO Sigma makes junk.
I tend to agree with you, it's a budget brand after all. Correspondingly, when it came time for my amateur ass to buy a 300 f/2.8, there was no way I could reasonably justify the Nikon. Fortunately, it was money well spent and the Sigma delivers the performance I need and expect. Quite surprisingly, when it comes to focusing on distant cityscapes at night, phase-detect AF does as well as I can manage with live view and manual focus.
On the other hand, for lens purchases I can justify, which tends to be anything south of $2,500, my money is with Nikon every time. Reports from users who seem to have no problem sending their brand new lenses back to Sigma for proper calibration (i.e. the 50 f/1.4) give me enough reason to stay away.
p.3 #4 · The sharpest autofocus SLR lens ever is a Sigma?
I have the Sigma 70 2.8 macro and use it with my D800, it's a great lens, sharp, low distortion, good contrast. It doesn't make sense to compare the MTFs from the Canon body to a Nikon body with a different megapixel density.
p.3 #6 · The sharpest autofocus SLR lens ever is a Sigma?
Mark_L wrote:
...the [Sigma] 85mm f/1.4 will also go toe to toe with the nikon G version.
Does it? If test measurements are to be believed (which unfortunately tell an incomplete story), it handily outperforms the Nikon AF-D version, but for applications where edge-to-edge sharpness is critical, it doesn't measure up to the newer AF-S. Granted, for portraiture where sharpness throughout the frame may not be the most important criteria, the difference may be less practically relevant. That's why I'm still happy with my 1.4 AF-D, which is a real dog as the numbers go.
