I don't use a Brightscreen? But I did use a 'da Oly Protector™' from
http://www.daproducts.com/products.htm that worked well on the D30/60.
You might want to check them out.
I see you are a very experienced photographer. I saw your link in the forum regarding brightscreens. I wanted to ask your opinion about this product for a non professional photographer. I want to buy a Canon D60. I found a used one with the brightscreen but don't know if it is worth having. There appear to be some trade offs with having it but I don't really understand how they may affect me. Any help you could give me would be greatly appreciated.