I keep getting an error message on my canon 1100d, when taking photos on my 70-300mm tamron lens when the lens is on 300m it wont take the shot, it keeps showing an error message about the contacts ...
I've recently come back from a caving trip where there was quite a bit of (surprise surprise) mud and dirt around me. While I did try and take care of the camera (I carry all my gear in Pelican Cases) ...
My viewfinder (not LCD) has spots of dust on it. What is the best way to clean the inside? I have cleaned the outside with a QTip.