Hello, I am looking to do a budget anamorphic setup with my G2 using a projection lens. I have been looking at the Kowa 16h and 16d and the Sankor 16c.

I am a bit confused on a few things. I found a place to buy step-up rings for the front to add a rangefinder for focus ect but my issue is how to know what clamp is needed to use with my current lenses. I own a sigma 18-35mm cine and a slr magic 50mm apo, both have 82mm front threads, how do I attach the projection lens to use these as my taking lens? Links would be appreciated!