Top wrote:
A brief cavaet:
Troublemaker is refering to the 'E' series Kalart side-mounted RF.
The Kalart'F' series is actually adjustable to a greater range of focal lenghts, but it's construction makes mirror replacement problematic.

How can these two be distinguished?were they both on 4X5 crowns?

The F Kalart RF is finished in natural metal and has the adjustment scales on the outside of the RF body. It was phased out in the early '40s, and you are unlikely to encounter one on a Crown of any format.
The E Kalart RF is finished in black enamel, had all the adjustments contained within the body, takes the Focuspot, and is far more likely to be found on a post 1942 camera, including Crown and century Graphics.
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