I held my Russian MTO500 Mirror lens over the mount of my Pentax 6x7 Mk II and took this outside our back door in bright light. It was DIM to focus as lens is only f8. I think I used the 'Spot Metering' of the Pentaprism. You can see the 'Doughnut Rings' of a Mirror Lens on the photo. Tripod used.
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