This was an excerpt from a file I had from GWX called 'German Optics' It is too big to upload onto this forum:
"Later types were the C/9, C/12 and C/13, all having minimal differences between
them, and all having an installable binocular eyepiece. The lose of interior space
required to install the aditional prisms forced to drop the split-prism stadimeter,
thus distance was calculated simply with the graticle. It was felt that the better
depth perception, light admission and clearer view for the observer more than
compensated this."
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