Monthly Archives: November 2020

USM refurbishing

Cleaning of the optical encoder ring helps only the focus hunting cases.When the problem is with the usm ring, I refurbish them with degreasing, polishing both rings to get back the plane, shiny surfaces, then cleaning again, after which mounting … Continue reading

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Eastern Egg in a 17-85 IS

I had to replace the aperture cable – and I found the former one too, which the other service did not removed before mounting the new one. They dont like to disolder?!

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