Five Stars

A+!

Sharp

I bought this lens through Amazon. It was delivered directly from Japan, and delivery was quick. I shoot on a D610. My original pictures were a bit lackluster but didn't have any focussing problems.

As good as any native lens on the A7r3

Eye autofocus works even in the worst light with this lens. It is tack sharp wide open at f1.8 and requires no stopping down to guarantee focus even in terrible conditions. The resolution is easily good enough for the 42 megapixel sensor.

Durable; Great Picture Quality; Simple Controls

Bulky

A+ Best in Any Class for Sharpness

First... wow, what a beast! This is a seriously massive and heavy lens. The size, heft and operation of this lens just oozes quality. Photographers struggling with weight issues are strongly encourage to find an 1130 gram weight (39.87 ounces) to get an idea about how massive this lens is.

Sigma's range of Art lenses has catapulted the company into the upper echelons of lens production, and the 135mm f/1.8 demonstrates the appeal of the series beautifully.