To convert TOYO 810GII & 810MII to 5x7 or 4x5 format: Add reducing board and ground glass back. When used with reducing adapters, the #180-820 will not provide clearance for a Polaroid© 545 4x5 holder. Reducing Adapter 8x10 to 4x5 requires 4x5 back
Reviewed by 1 customers
This 8x10 reducing back is just the metal plate with the sliding latches. You need a separate 4x5 back, which I borrow from my 4x5 Toyo rail camera. My application is to actually use a DSLR mount in the 4x5 opening when I want to perform experiments with the properties of some of the LF lenses with macro extensions that I can not achieve with the 4x5 camera. Seems like a bit of money for such a simple thing. But if you need it, you need it. It is light but rigid enough for my purposes.