EOS SL1 auto focus doesn't work. Seems to happen on hot days

[Bankesmom1]

My Rebel SL1 with a Tamron telephoto lens won't auto focus on warm days.  It will sometimes work at close focus, but when zooming in, it won't auto focus. Does anyone have an answer to this.  Same thing happened last year, but my local camera shop could give me no answers.  It was the shop where I purchased the camera, and I was disappointed with their response.  The weather has warmed up, I wanted to take pictures at a grandson's baseball game and no autofocus.  Frustrating.

[Bankesmom1]

OK.  I will check the screen.

[deebatman316]

Your out of focus pictures report MF according to the metadata. Not any AF operation.

[ebiggs1]

"I also noticed on various shots that not all of the red lights were lighting up in the view finding when focusing."

This could be because you didn't turn off all the other focus points. You want just the center focus point to be turned on. Consult your manual or YouTube if you don't know how. This is probably the reason you are having trouble. You are giving the SL1 too many choices and it can't find one that works. Use just the center point an One shot AF.

Please ignore all other advice and suggestions until we get this sorted out.

[Anonymous]

"Please ignore all other advice and suggestions until we get this sorted out.

EB"

Wow!

[ebiggs1]

Too many suggestions can only confuse her. We have to have the camera back to basics and with known settings to analyze the problem. Then start the process to determine whether it is the camera or the lens or both or her. This is basic troubleshooting, my friend.

[Anonymous]

When you place the lens in manual focus, you must focus the lens yourself. I don't see how you would expect a lens in manual focus mode to produce focused photos automatically, unless the lens is not able to be manually focused either. Is this the case?

[kvbarkley]

That seems to be the problem, the lens is putting itself into manual focus. I would guess a bad switch that Tamron needs to repair.

[Anonymous]

The OP said that they put it in manual focus to take the shots that they posted that are out of focus, so I am confused.

Yes, I would agree. It looks like the lens needs repair.

[deebatman316]

"There was some clicking like noise going on, but it would not make the exposure.  Then I took my finger off the shutter button tried it again and it did take the exposure." 

There maybe something mechanically wrong with the lens. A lens shouldn't be making a "clicking" noise. While the lens is focusing.

[Bankesmom1]

I don't expect the lens to automatically focus when I have it in manual mode.  I switched the lens to manual focus, so that I could catch the action.  I had to focus it myself.  I've never expected it to focus automatically while in manual mode.