If you are far-sighted and need to change the optics of the M10's 0.73x optical viewfinder, this Correction Lens II from Leica will provide a +1.5-dioptric adjustment. This will help shooters more comfortably use the camera, in some instances permitting use without the need for glasses.
Warranty:
Leica Camera AG (‘LEICA’) provides a two-year product limited warranty for this LEICA accessory.