1870s petzval to pentax 6x7 67 adapter
thingiverse
Pentax 6x7 67 adapter for a 1870's Petzval lens. This lens doesnt have a 4x5 image circle and is perfect for the pentax 6x7 camera type. The Adapter is developed to focus 0,5mm over infinity to get a most reliable infinity focus and a close focus of around 1,5m.
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