Current Kit List:

Pentax K7
Pentax MX
Canon 220HS
Pentax PZ70
Tamron 17-50
Pentax DA15mm
DA 18-55mm WR
Pentax F35-70mm
Pentax M50mm f1.7
Pentax DA35mm f2.4
Pentax M 28mm f3.5
Pentax M75-150mm f4
Pentax K 135mm f2.5
Sigma Super-wide II 24mm

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Using M or K Lenses:

In the 'custom' menu:

'Using aperture ring' - set to 'permitted'.
'Green button in manual' - set to 'Tv Shift'.

Now with the camera in 'Manual', simply pressing the green button will set the correct shutter speed for whatever aperture you have selected on the aperture ring.

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35mm vs APSC DOF/FOV comparison:

50mm F5.6 on 35mm

34mm f5.6 on APSC

200mm at f8 on 35mm

135mm at f8 on digital

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Pentax 17-70mm
http://www.photozone.de/images/8Reviews/lenses/pentax_1770_4/samples/IMGP2779.jp...

Tamron 28-75mm on FF
http://photozone.smugmug.com/photos/475057386_gi6AT-O.jpg