05-14-2011, 09:49 AM
[quote name='PuxaVida' timestamp='1305365847' post='8312']
Apart from the light gathering and the impact of this on CD, the contrast analysis by checking the daha of adjacent pixels on sensor would be different if the aperture was closed for a lens with RSA problem... Therefore I think having and advantage in terms of RSA requires closing of aperture right before performing AF... Or am I missing something?
Serkan
[/quote]
Yes, you are missing something. I don't know how pana/oly cameras behave, but on Sony Nex cameras, the aperture is always closed (all the time) to whatever aperture you set it. It's never wide open, unless you set it wide open. (that's true for native e-mount lenses, not for A-mount lenses with the adapter). That's how it works in video and stills (that is liveview on dslrs). And there is AF in video mode too.
Apart from the light gathering and the impact of this on CD, the contrast analysis by checking the daha of adjacent pixels on sensor would be different if the aperture was closed for a lens with RSA problem... Therefore I think having and advantage in terms of RSA requires closing of aperture right before performing AF... Or am I missing something?
Serkan
[/quote]
Yes, you are missing something. I don't know how pana/oly cameras behave, but on Sony Nex cameras, the aperture is always closed (all the time) to whatever aperture you set it. It's never wide open, unless you set it wide open. (that's true for native e-mount lenses, not for A-mount lenses with the adapter). That's how it works in video and stills (that is liveview on dslrs). And there is AF in video mode too.