Sigma 24 1.4 Art

haroldp

Imaging resource tests are much more useful to me since they show sharpness at many points in the frame, at each f-stop, and for multiple focal lengths for zooms.

http://www.slrgear.com/reviews/index.php

An example is th much maligned 70-200/2.8 VR1.

This lens loses out in DXO tests because on an FX frame, it is very slightly soft at 200mm at f2.8 at never gets really sharp in the corners at 200mm.

From 70-135mm it is very sharp across a wide central area even at f2.8, and sharp in the corners by f4.

At 200mm it is very sharp across a wide central area by f4.

As I would never use this as a landscape lens at 200mm. For sports / wildlife, I am always stopped to f4 or less for DOF, and the likelihood of anything in the corners being in the plane of focus is very remote.

Others may have different use criteria and find this lacking.

A single DXO type sharpness score does not give me as much useful info as the imaging-resource type tests to evaluate a lenses usefulness to me.

... H

donaldejose

haroldp: Agreed!