I'v replaced the lens panel lock with a nice brass one ( the lens panel is 80mm x 80mm so Horseman 6x9 lenses fit on it for DOF focusing). Its got a 0.4mm hole which comes out at f125 (50mm) f162 (65mm) f225 (90mm) and f362 (145mm)
Karlos No.2, 6x9 SLV non folding flatbed with Topcor 105mm f3.5 in a Seiko-SLV shutter and an Adapter-A-roll 620 film holder.
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