Many thanks for posting these. I'm thinking about getting the DP-170 n85 version 1 and some extensions, for more versatility. I'm confused about all the different DP-170's though, there seems to be three?
1) DP-170 n85 version 1
2) DP-170 n85 version 2 (like version 1 with 25mm built-in extension)
3) DP-170 n120 (no idea what this is -- seems to be the same dome as the n85, but hard to tell, perhaps it's for DSLR housings?)
Presumably all use the same glass and same optical coatings?
Is it possible to attach the DP-170 n85 version 1 to the housing without using an extension?