Revi 3a

De Finse D.XXI was uitgerust met een Duits Revi 3a vizier.
Nu is mijn vraag wat zag je in zo'n vizier? En werd het metalen vizier dat er op zat altijd gebruikt, of alleen in noodgevallen wanneer de gereflecteerde afbeelding niet werkte?

The Finnish D.XXI had a German Revi 3a gunsight.
Can anyone tell or draw me when one saw while looking through it?
And was the metal reticle allways used, or only when the reflected image did not function?

Here is a nice site about german reflector sights;

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and this...

Instrumentpanelen

It basicly showed a lit crosshair, which was projected on the windscreen using mirrors. It was giroscopic, so if the plane moved, the sight provided some aid when a pilot had to do deflection fire.