Yes.
The lense was the 18-55mm kit lense that came with my t3i. I was using grey backdrop three Einstein strobes for lighting using modeling lamps. Here's one of the photos from the sessionYes.
More details needed. What lens(es)? What lighting conditions? What AF mode, and other AF settings? Using the AF Assist of the built-in flash or accessory speedlite? Checked that the AF sensor holes at the bottom of the mirror box are free of lint?
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Unapologetic Canon Apologist
What would you recommend to clean the contact points?
Denatured Alcohol with a cotton swab. Do Not use any type of abrasive type material in the cleaning process.
that was when the auto focus was working, I'm just wondering why sometimes it won't work and shutter button won't trigger.
With relatively dim lighting (even with modeling lights), and slow f/3.5-5.6 lens, AF is going to be spotty. One-Shot AF mode won't allow shutter release if it cannot confirm focus.
Do you have a different lens to try? Electric contacts rarely need cleaning. They do make an electric contacts cleaning pen. I'm sure most people have no idea how to denatured alcohol!
You buy denatured alcohol at a drug store, it's different from medical rubbing alcohol.
Make sure the option "C.Fn II Lens drive when AF impossible" is set to 0: continue focus search.
