My understanding is if I use the small medium and large images that the small will be used for category listings, the medium for product info and large for when clicking large link on product info.

my question is, if I use the medium image size, what imge does the thumnails for the addional images on the product info page use?

would it be the same as the main image Medium, or are the small ones used?

I ask because I want quite large medium ones, but it is uses the medium size for the tiny thumbnails then it will be a bit of a waste of bandwidth..

Phil