You can try to remove the lens and see if there is anything obvious - try a mirror lock-up for cleaning, too. Only do something if there is something really obvious.
You can try to remove the lens and see if there is anything obvious - try a mirror lock-up for cleaning, too. Only do something if there is something really obvious.
Warning never actaully touch the mirror. It is very fragile and easy to scratch.
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"...my canon camera has an Err 20 that keeps popping up.."
If it is truly an important event and you have err 20, you need to use a different camera. Do not trust this one. Err 20 usually means a trip to Canon service.
EB EOS 1DX and 1D Mk IV and less lenses then before!
"...my canon camera has an Err 20 that keeps popping up.."
If it is truly an important event and you have err 20, you need to use a different camera. Do not trust this one. Err 20 usually means a trip to Canon service.
Trying to photograph an event with only one camera is a rookie mistake in any case. If it's outdoors or in a big room, you're sure to need both a normal lens and a telephoto, and you almost certainly won't have time to change lenses on the fly.
