Whether and to what extent one should therefore clean photo-sensors, I can not judge exactly - but as long as only air comes to the sensors, while nothing should go wrong.
The brush I consider only as a bonus - because this is not optimal - as a brush but he does not really convinced and on the bellows he does not so much by air, that he makes a lot of sense in this regard. But if you do not brush it - it's better than nothing in any case and if one anyway dabeihat the bellows, then allows the brush to save space carry.
