Zoom Gear for Dummies

Hi folks,

I've just moved up from Oly 3040 to DSLR. I was guided in my purchases by Wetpixel and Woody from Nexus America who's apparently very knowledgeable but not particularly forthcoming when it comes to instructionsl

Among the gear I've bought (featuring demo model Nikon D100, used Nexus D100 housing, modified Sigma 28-80 Lens, 60 Macro Port, Inon Z-240 and Ultralight arms.) is a zoom gear for the lens. So here's the "dummy" part: I'm not sure what it does (though I suspect it has to do with manual zooming) and certainly have no idea how it installs.

Anyone care to advise, after you've finished laughing?

Thanks!

Peter

Look at this link from Ikelite's site

If it's still unclear ask again and I'll try harder B)

Thanks, Arnon...

I'm "getting the picture"