Barlow Question??

When Barlowing my Pan 35mm. with Tele Vue's 2" BIG Barlow, I found I had to acquire the TV interface, my question is; I have heard that when joined together the system can be used like a *Powermate, is this correct? Have not had the chance to experiment yet, too wet """""" thank you John M

That is how Nagler described it in an Ask Al response years ago, i.e. before they actually bothered to make a 2" 2x Powermate.
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Mike