Performance of a9 focusing stopped down in AF-C in low light?

Started 2 months ago | Discussions thread
vett93 Veteran Member • Posts: 4,867
Re: Performance of a9 focusing stopped down in AF-C in low light?

Sentenza wrote:

vett93 wrote:

Sentenza wrote:

aSevenArr wrote:

The A9 has excellent low light performance, it’s one of the reasons that I love the camera.

Even when using narrow apertures?

It depends on how low light and how narrow aperture. I have found that I had to widen the aperture at times so that the AF can work reliably in low light.

By any chance, do you remember approx. the light level and the aperture at which it struggled, and then the aperture at which it could focus reliably?

I think the EV was between -1.5EV and -2EV and the aperture was around F/5.6. This was with my FE24-70/F2.8 GM.

Both A9 and A9II can AF down to -3 EV. Sony may need to up the tech. According to Canon's website, their EOS R can go down to -6 EV.

The EOS R -6EV rating is indeed impressive, albeit that's at F1.2, vs. A9/A9II -3EV at F2.

I wanted to move to Canon RF, because they have great glass, and because the RF bodies always focus wide open (huge selling point IMO compared to Sony E mount), but then I realized that I don't want to carry around an 85mm prime that weighs 2.6 pounds (no matter how optically outstanding it may be). And we probably won't see an RF 85 1.4 before several years (the 85 1.8 will come before the 1.4, and I want faster than 1.8).

I think it depends how many of these 2.6lb lenses one has to carry around and for how long. My Sigma 85 ART and 135 ART are around that weight.

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