Follow the same guidelines as you would for M42 lenses:
https://www.pentaxforums.com/forums/54-pentax-lens-articles/110657-how-use-me...k-x-k-7-a.html
In M mode, the brightness of the live view screen corresponds to your exposure, so that's the mode you'll want to use. You can also use Av mode, though in that mode the live view screen will remain bright, and the camera will automatically set the shutter speed.
Adam
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