Kostas Kavoussanakis wrote:
I am hoping to use it with the Tamron 90/2.5 (49mm) and adaptall; I guess I need the dedicated converter to go 1:1 with this.
It's just an extension tube. You could use any tube of about 30mm. Maybe a bit more - I don't even know where mine is at the moment.
Not just that. It is a 2x TC with an extension tube. As it moves the lens relative to the converter it resembles the FREE-principle in some Pentax lenses. I think this is one of the things that make it quite good for macro uses along with a good 50mm. I used that combination on both my two previous PUG entries.
The Tamron goes to 1:2, so I can�t se why it shouldn�t go to 1:1 with the TC, but I haven�t tried....
DagT
