Manual focus on a DSLR.

[ajohnw]

Here is the E-M5 one which is obtained via one of the art filters. In this case the camera is set to use the filter on the jpg so the real shot has to be developed from raw. The other way just activates the filter when one of the programmable buttons is pressed.



John
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[ajohnw]

And this one the E-M1 - not the most suitable language but a good demo.



John
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[Panama Hat & Camera]

Second, I have read that alternative focusing screens can degrade the performance of the AF system.

Dan,
I hadn't understood it completely your affirmative, and because of it, I opened the new thread How autofocus and exposure metering work on DSLR?.
After Kathy's explanation, I understand what you said.
Thank you very much,
Antonio.