Panasonic 20mm f/1.7 Auto Focus

Anders, please don't tell me what my key point was.  If you look further back in the thread, to my first post, you will see I say (referring to the 20mm):

Interestingly in low light the E-M5 hunts more with this lens than my old Panasonic G3 did. I was shooting an evening event at church a couple of weeks ago and the E-M5 struggled to secure focus lock, whereas the G3 had no problems at all.

No more, no less.  Now I believe your key point of interest / contention is what you say mine should be, namely that "the 20 has more difficulties to lock focus on the E-M5 than the 45".  I was comparing the bodies in my original post, not lenses, and you only need the two bodies and the 20 for that.  Subsequently you bought other lenses into the discussion in your later post and that was why I made the comparison you quote above, but that is not my key point.

Anyway, if you wish to repeat the tests with the E-M5 then the situation was this:

• Venue: Interior of church building, stone, carpeted
• Time: After dark
• Lighting: Mixture of spotlights, coloured lights and dim background light from a projector
• Target: I found the biggest problem with the E-M5 was focussing on brightly coloured beanbags!
• E-M5 focus settings: S-AF, tried with both standard focus point and 14x reduced focus point.  I also tried with the art-line focus peaking and MF to see if I could do any better.

Here's a sample!  By the way, the 20mm is still good at focussing in low light on the E-M5, just not quite as good as with the G3.  The low-light abilities of the sensor and the astonishing IBIS far outweigh the difficulties though!

Michael