Bronica ETR and the AE finder

Hi all

Just got a Bronica ETR and it looks amazing. This is my first venture into the world of medium format cameras so any pointers would be highly valued.

Everything seems fine and have got o ver my first issues such as how do I take the lens on and off etc etc. I'm stuck with one thing however. I have a 150mm lens and for some reason the AE finder (an AE 1 I believe) seemss to work and I can see the lights inside it but I can't see anything clearly in there sometimes theres a tiny red light in the bottom left sometimes its on the bottom right and then can move around the bottom, sometimes its green. i can not see it well at all and wondered what was going on down there and woondered if I should be seeing it clearer or why I might not be. I want to try and make sure I have worked out most parts of the camemra before running off a film and feel I've made good progress but this has stumped me, maybe somethings wrong? Also the camera via the viewer doesn't seem as sharp or as clear as I would expect. The view lens is a -0.5, that the correct one?

Any help much appreciated.

This may be of some help

Link ... Bronica AE-1 Finder