Simon [springtide]; sorry if misunderstanding you [quote above] but doesn't your camera have the viewfinder "shield" attached to the camera strap that came with the camera? Maybe I'm confused with which camera you have
The a700 [and I'm assuming the others] come with a "shield" to clip in to the viewfinder when taking long exposure shots or cable/remote release ones. The rubber over the viewfinder eye piece has to be taken off so that this cover pushes in.
Well, I never! So it does
I thought that was just for the flash mount, but you are right - it's a viewfinder blackout blind also!
In my defense I've never actually used the Sony strap as I was given an OP/Tech strap by a friend
But thanks, I now feel a little stupid