English: Canon focusing screen for (original) F-1 camera. As described by contemporary literature in 1975 and dealer's notebook, this Type D screen includes:
Central fine-ground matte spot
Matte-ground Fresnel field
Etched horizontal and vertical grid lines
Central area metering rectangle (approximately 12% of frame area)
Spot meter circle (approximately 3% of frame area)
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Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.