5D2 viewfinder turn darker w 2470
I have this problem recently when I mount my 24-70 (version 1) to my 5D Mark 2 (yes, old camera, but still work well)
I kept getting an error that contact is having a problem after I taken a shot. When I peep into the viewfinder, I saw that the whole image is very dark. There is no problem with other lenses upon seeing through the viewfinder.
But when I tried to zoom the lenses, I can feel that there is certain thing has just come out underneath the zoom ring.
Does anyone have this problem before?