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DPChallenge Forums >> Tips, Tricks, and Q&A >> Auto Focus Question
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08/13/2006 01:39:11 PM · #1
This is the set up.

Low light venue.

Quantum battery for flash, 100 iso, 50 mm 1.4 lens wide open,80 shutter speed, RAW.

I had to use manuel focus to get my pix in focus. The auto focus was of no use.

WHY?

Thanks in advance.
08/13/2006 01:40:50 PM · #2
Low light
08/13/2006 01:42:33 PM · #3
Autofocus needs contrast to work. Low light venues are typically lacking in contrast, unless there happens to be a light source visible in the area autofocus is seeking, and even if there IS that may not be where you want focus to be. I always use MF in low light; ALWAYS. I don't trust AF in low light.

R.
08/13/2006 01:45:04 PM · #4
Some flashes/cameras can send out an infrared light that will measure contrast and help to auto focus. I know some Sony cameras have this. There's a add-on to extend the range available for them too.
08/13/2006 01:50:02 PM · #5
How Canon AF works
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