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Sigma 400mm Lens Goes Haywire.

Started Jun 12, 2021 | Discussions thread
neilt3
neilt3 Veteran Member • Posts: 3,008
Re: Sigma 400mm Lens Goes Haywire.

Regards fast and slow AF , it might be better to call it "standard AF Speed " and "faster AF Speed" .

All cameras work as a standard / slow speed .

Only certain cameras have the faster setting .

So the A5** models don't have two options , they don't have the hardware for the faster speed , hence the absence of a "fast " setting .

It's just some lenses are more susceptible and being old lenses have more wear to the gears .

I had the a580 , and although I would call the AF speed satisfactory it certainly wasn't fast .

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