Thanks to its highly corrected optical design, Sigma’s new full-frame 35mm f1.4 HSM A achieves the highest DxOMark score in this group but, unexpectedly, sharpness is slightly lower than the $325 Sony DT 35mm f1.8 or the ultra-fast 35mm f1.4 G. However, bear in mind with the latter model there’s only a slight improvement in center sharpness when stopped down and there’s a hefty $470 premium to consider. In all other respects the Sigma is the better-corrected model.
|Sigma 35mm F1.4 DG HSM A Sony||899||26||11|
|Sony DT 30mm F2.8 Macro SAM||300||22||12|
|Sony DT 35mm F1.8 SAM||325||21||13|
|Sony 35mm F1.4 G||1369||21||13|
|Sony 28mm F2.8||270||15||11|
As for the DT 35mm f1.8 it has consistent sharpness from edge-to-edge when stopped down to f2.8 and beyond on the A77, while the softer, wider apertures make it particularly suitable for environmental portraiture.
At $300, the modestly priced Sony DT 30mm f2.8 model is good value as both a macro and a ‘normal’ lens. It has good central sharpness but this never extends to the outer field, the edges or corners, even when stopped down. That’s disappointing in a macro but not so much of an issue for a general-purpose standard lens.