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Hello Luigi,
We tested our K10D screen in the K20D for correct fit and focus calibration. I can confirm that the Katz Eye screen functions correctly in the K20D in those aspects. We have not tested the meter response in the K20D to know what, if any, effect the new focusing screen will have. I will keep your email on file and if we do any new testing with the light meter in the K20D, I will be sure to let you know.