split field - need to split a lens

As far as I have been able to find out, I cant buy a +4 splitfield lens with 77mm diameter. Largest appears to be ø72mm But I got a regular close up +4, and I figured it could be cut in half. However I am unabel to find any optical workshop who are willing to give it a try, they expect the lens to crack or otherwise endup broken.

Anyone can tell my where/how to have it split. Or where I can buy one the right size?

thanks

I have a subal 77mm as well Ryan at Reef photo can have one sent your way as well. Mark

Subal does indeed make the size you need.

Joe

Thanks all. Now if only the Subal rep here in Norway would dignify me with an answer (to my email) as to how much is costs...