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How to Properly Clean a Lens Film Cameras

Lens 55mm f2.8 52107. Like a very small chile in the front ball. It is transparent and beautiful optics. All three were checked for normal operation. Mint mamiya 645 e + 55mm f2.8 150mm f4 105-210mm f4.5 3lenses set from japan there is no problem in use. You can check the front neatly.