Has anyone used a Minolta Booster 2 attachment for ground glass focusing? Any suggestions or advice is welcome.I also need to obtain a Minolta meter to use with this item so what should I be looking for? I'm also planning to try "behindthe-lens" filtering for a change. Wouldn't GG focusing be ideal using this filter system? I presume there would be no need for bellows extension compensation and filter factors when using GG metering. I've been curious about this type of metering for many years and eBay and the "D" revolution has made obtaining the above "tools" inexpensive and convenient! Thanks in advance for your insight.