Hogwash. But seriously I have not noticed any degradation. I guess obviously if it was dirty or had something on it sure. Seriously though i think some reports like this are more internet lure than anything else. Maybe Im wrong but I have not noticed anything like this. Including the newest one I read today with regards to banding blaming lossy compression. But here is the key have you seen anything faster in 1.8 in a FE mount. Only the A mount is faster. Now if maybe I had a A7s than speed of lens may not be so important but shooting things at F4 and yes i am STILL HIGH ISO shy makes me nervous. Okay I went off topic. You remember my 55, 85 and 135 test. Well the 85 and 135 where with the LA-4 and they did very very well with the 55 1.8 which maybe only the OTUS and Sigma Art can beat the 55.
Hi Guy,
The E-Mount lenses are not the fastest but compared to Fuji or to the A77II the FF-sensor allows quite shallow DOF. And with the A7s high ISO capability is quite good and a little slower lenses not that much of a problem.
People see a m43 12-40/2.8 as fast lens , and a FF 24-70/4.0 as slow lens. For me a 12-40/2.8 m43 is equivalent to a 24-80/5.6 FF lens, a 50/1.4 on DX I see as a 75/2.0 FF lens.
More important than max f-stop of a lens - for me-is that the widest f-stop is really good and usable.
So far I am quite happy with FE Zooms (24-70 and also the 70-200 seems quite good).
I have waited long before eventually checking out an A7s ... but I am seriously considering to sell my Canon 5DIII and lenses. Of course the Canon is faster and does nice focus tracking, but the A7s an A7 do focus faster than I had experienced. (I would never chnage if sports were my main interest - but my kids are fast too sometimes and the A7s so far keeps up pretty good).
sorry, off topic.