Wista manufactures for the RF,VX,SP and DXIII cameras a device fixed to the focusing screen frame.
The 5x lupe can be moved upwards and downwards on the focusing screen, without being hand held.
Both hands are free for focusing and other movements.
The exact name is "Wista Sliding Magnifier Focusing Attachment".
I would like to know if this device is only for Wista LF cameras or if it can be attached on other cameras. The attachment doesn't look like a Graflok.
Is it really as useful as it seems ?