A6000 vs. A77ii Continuous AF - Very confused

Started 8 months ago | Discussions thread
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Re: Still the f/3.5 or smaller aperture restriction on low light continuous AF?
In reply to teddoman, 8 months ago

tedandtricia wrote:

Evildogofdoom wrote:

tedandtricia wrote:

Anyone know if the A77 II still has the restriction on low light continuous AF that all the older bodies do (A37 A57 A77 A99)? On the old bodies, you can only do continuous AF at f/3.5 or smaller apertures, which pretty much rules out low light continuous AF (unless you apply a mechanical hack which not everyone wants to do).

Just wanted to find out if the restriction is still in place on the new A77 II body.

This is not true. The f3.5 limit is only for focusing at 12fps, on the A77. The cameras will otherwise continually focus at the maximum aperture of the fitted lens. The f3.5 limit is more a limitation of the mechanical aperture opening and closing 12x second.

Thanks. That's a helpful clarification on the photography side.

Still appears to be a limitation for video since at a minimum you'd shoot video at 24 fps.

That's for a different reason. For stills, the aperture has to keep flipping between 3.5 and the desired one. It can do that at up to 8 times per second (or, rather, it's willing to do that up to that rate). For movies, the aperture isn't filling at all. There, it is continually at one setting. The AF system, however, or at least on all the crop SLTs up to at least the A77, the aperture must sit at 3.5 because otherwise it can not see depth accurate enough to provide good continuous auto focus during video recording. I don't know if that's the same with the A99, or the A77ii. In theory, the A77ii *could* employ CDAF for video so that it would let you AF during video using apertures up to around f/11, like the mirrorless ones do. The word CDAF on any SLT including A7ii is a complete no-no, so probably most would immediately assert that no of course it doesn't do that. But... for video, in theory, it could. *IF* Sony wants to provide the same flexibility for video as what you get on something like an A6000, they could port some of that code over to the A77ii, as this is likely simply done in software (possibly assisted by hardware, but that's likely shared anyway). Anyway, if it did that, it would have probably come out at this point already. Or not... because I find that when you start talking about specific video details, it's surprising how little back you get. So this issue could simply have been overlooked up to this point.

A simple answer would simply to test it. Who's got an A77ii handy to answer this question in like 5 seconds flat?

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