A quick and technical question about autofocus.

Started 3 months ago | Questions thread
Tazz93 Senior Member • Posts: 2,525
Re: A quick and technical question about autofocus.

The Ambassador wrote:

Thank you for the accurate reply.
Yes, front and back focus is now clear.
My other question was related to low light focusing. For what I heard in the reviews, there are some better and worse lens, as regarding this aspect.
I don't understand if this applies to mirrorless too. Thank youu

Ah... yes, some lenses are better in low light than others. All things being equal, the faster lenses (i.e. lower f stops like f/1.8, f/1.4, etc) will be able to focus in lower light levels better than the slower ones. AF systems need light, so the faster the lens the better they will focus, in general. This works similar to our eyes. If you walk in to a dark room and squint (imitating slower lenses with smaller openings), you'll notice its much harder to focus your own eyesight. The camera system isn't much different.

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Mike Jackson - Wildlife Photography Enthusiast

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