Hi all 
I'm looking to get a Polaroid back for my Mamiya 645Pro and in looking at the offerings at Dead Link Removed (scroll down to bottom of page) I see there are two types; One has a dark slide and the other doesn't. So, which one? Is one better than another?
Thanks for the help!!

I'm looking to get a Polaroid back for my Mamiya 645Pro and in looking at the offerings at Dead Link Removed (scroll down to bottom of page) I see there are two types; One has a dark slide and the other doesn't. So, which one? Is one better than another?
Thanks for the help!!