Hi,

I got revolving Toyo camera back. I have two different Toyo back already, but this one is different. There's plug connector on the revolving part.
What is it's purpose? Some kind of a heating for ground glass? (see attachments)

There's another strange thing. The back came with broken ground glass. The grid and markings are similar like in those on Toyo Field 45A or 45AII's ground glass, but there was no sign of fresnel.
If I have understand correctly, all Toyo Fields (and revolving backs) should have fresnel under the ground glass. If not, then how to identify those camera backs that doesn't work properly when fresnel is installed under the ground glass from those which requires fresnel (or shims)?


Attachments has some photos showing the connector and the parts of the camera back.

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