Sorry for not being clearer, the Siebert is the 36, and those arent cheap, but they too are nice and light. The Russels are a blast basically you can get a 45 56 and 65 for the price of the TV. I havent used the TV so I cant comment on the performance comparison. I have alot of different optics that I put the NV gear into from 180MM to 4M focal length, so its nice to have some variety.. Other advantages they are light weight (yes they are plastic), and I have mine tapped 48MM female thread on top, and use a 48MM male to male to the TV adapter (I have a precise parts adapter coming one day). (Not sure Gary does the 45 any more you would have to ask him).