Linhof Right-angle viewer hot spot

[Al Seyle]

With my purchase of a new Linhof TKs I bought the rt-angle viewer (Winkelspiegel ). Using my 180 or 110 the corners are much darker than I would like. Is there a better glass than the factory gg which will help even things out? - ie fresnel, Boss, etc.?

[Bob Salomon]

The Right Angle Reflex Viewer and the Focus/Meter Bellows REQUIRE the fresnel screen. From whom did you get your TK?