[Brightcolours]

But Pentax did a bit more with the moving sensor. And the SLT is in DSLR world still unique - so why did not Canon refresh their invention? The disadvantage of SLT is loosing light for both, finder and sensor, so I just think, Canon didn't want to receive tons of negative comments about that.

If you look at Sony's SLT..

• The first 2 models had ghost light issues due to bad implementation of the mirror.
  
• Indeed, you do lose light to the imaging sensor.
  
• You lose the OVF.
  
• I have tried an SLT Sony a few times, and it is pretty horrid to see the too low frequency LCD flicker and lag and look harsh and not right.
  
• You use live view all the time with the SLTs, creating sensor heat and wasting battery power.
  

I do not get the SLT idea. The Sony SLTs don't do anything better than normal DSLRs. Canon did not ditch the concept for no reason, I guess. Advancements in shutter and mirror mechanics (speed) made the pellicle mirror obsolete for them.