Depth-of-Field Preview - EOS R

Ciriaco Garcia wrote:

lawny13 wrote:

I do not despute the pros of having stopped down focus. I just loath the fact that on Sony systems you can not turn it off.

That is not always true. The Sony cameras may also focus wide open, but this is a relatively complex subject:

https://www.fredmiranda.com/forum/topic/1554180/

I have tested this with the 4 lenses I had (including the kit), and to me there is just two tests that really really matters.

1. Set live view update off. Set camera to AF-C, Press the AF-On button.

Behaviour: initial focus is done wide open (or at least partially so), and the lens immediately stops down and tries to do the rest of the focusing stopped down. If the light and f# setting means CDAF... well too bad for you.

2. The same is done with AF-S, but it stopped AF once obtained.

Extra behavior to note. With AF decoupled from the shutter button (for back button focusing) press the shutter half way and the camera will stop down for AE anyway. So rather than be able to just calculate and simulate the exposure it also stops down.

So... no matter what you do you will starve the sensor of light, and you have no option to turn this off. So, dinner parties and nigh events, kids parties, or any less than ideal amount of light and you have to shoot wide open to maximize AF performance. It is a shame you can’t have the best AF performance while stopped down. After all a scene were you want f4 for example doesn’t necessarily mean you can’t benefit for f1.8 aperture for focusing. Every experience photographer doesn’t need DOF all the time since they can estimate pretty well what will come out, or assess this at first. And you definitely don’t need DOF preview when shooting at 10 FPS and tracking since you won’t be paying attention to this.