I own an A7R2 and wondered if there was at least one decent APS-C wide lense (≤ 21 mm fullframe focal length) that is:
- a prime
- fast (at least F1.8)
- with autofocus
- E-mount or Canon EF mount (adaptable with a speedbooster or MC-11)
- not too noisy (like the Sigma art primes)
By decent I mean no chromatic aberration, I don't mind a little vignette or blur on the edge for 1080 video.
The only one I found was an APS-C 19mm, I think F1.8, with chromatic aberration.
i have always had a issue with, even when using the fastest cards the time it takes my A7r2 to present the preview , but i have always the centre zone area or the full area for focusing , but today I used centre and small flexible spot focus points and I am surprised to see how much faster the pre view appears . virtually instant, why on earth is that happening, very happy but surprised