Hello, Just was gifted the old Canon F-1. Looks as if it takes the old mercury battery. From posts that I've searched on here it seems an adapter plus the hearing aid batteries are the way to go. Does anyone have a preferred place to buy this? I found the below on ebay, is that good enough? Any place to buy it from the US? 1.35V MR-9 PX625 MRB625 Adapter + Battery For Film Camera/Light Meter MADE IN UK | eBay Thanks! Excited to shoot film for the first time.