Set AE-L button to AF-ON Question

Started Jul 16, 2012 | Discussions thread
hoof Senior Member • Posts: 1,904
Personally, I do the opposite method

Many people like the AF-ON techinque. Personally, I use a variant of that technique. I use the normal shutter button technique, and when I want AF to stop, I use the AF-L button. This is backwards from the AF-On crowd, they want to control when AF is on. I want to control when AF is off.

I do it my way because most of the time I want AF to engage when pressing the shutter. Locking focus (or turning AF off) is the exception for me. For the AF-On crowd, it's the rule, they want to only focus when they choose.

A disadvantage of the AF-On technique is that VR won't engage when you autofocus, until you depress the shutter. For long telephoto lenses handheld, this can hurt AF acquisition as the image bounces around due to camera shake. In addition, non-Nikon lenses ususally need some "settle" time, and that requires pressing the shutter button prior to taking the picture. Using the AF-L techinque, you've already engaged the VC/OS a bit while acquiring focus since the AF is driven by the shutter button.

The main downside of both approaches is the inability to lock auto-exposure. In the AF-On case, it's not mapped at all (if you've replaced the AF/AE-L button with the AF-On), in my case, I have to decide beforehand whether the button locks AF and AE, or just AF.

 hoof's gear list:hoof's gear list
Panasonic LX100 Olympus Tough TG-4 Nikon D750 Nikon D500 Nikon AF-S Nikkor 70-200mm f/2.8G ED VR II +21 more
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