topic Re: 40D Focusing Dots in EOS DSLR & Mirrorless Cameras

40D Focusing Dots

tastas — Sat, 11 Feb 2017 20:51:02 GMT

I have a Canon 40D which I've been using for birds in flight. It works very well with my 400mm 5.6 L lens. Typically, I choose a focusing dot--usually the middle one. (1 red dot in the middle and 8 dots around).

Question: Why has the top dot begun to stay lit? For example, I chose the center dot--it lights up but the top dot stays lit.

I can choose any of the focusing dots, but the top dot always stays lit with the one I choose. Always two dots lit.

Can anyone out there in cleverland explain why this has begun to happen and how it may affect focusing? Thanks

Re: 40D Focusing Dots

Waddizzle — Sat, 11 Feb 2017 22:54:54 GMT

That sounds like a malfunction to me, if it is always the same AF point. What about different shooting modes? What lights up in Green [A] mofe? What lights up if you select MF mode, and lock focus?

Re: 40D Focusing Dots

ebiggs1 — Sun, 12 Feb 2017 15:20:47 GMT

" Always two dots lit."

Does the 40D still work? AF is fine? If, yes, ignore it as repair will likely be greater than a good, working, used 40D.

Re: 40D Focusing Dots

tastas — Sun, 12 Feb 2017 19:04:03 GMT

Thanks...i use manual. I checked a couple of other modes...Same AF point stays on. I'll check some more..

Re: 40D Focusing Dots

tastas — Sun, 12 Feb 2017 19:05:55 GMT

It still works. Not sure if it lessens the focusing accuracy. Thanks for the message.