[Lixma]

Originally Posted by klem

With my left eye closed and the pen in the centre of my right eye vision and then I open my left eye, I don't see a ghostly image directly in front of me, I see the image of the pen in front of my right eye, not centred,

Then you are doing something wrong. You're supposed to be looking straight ahead, not at the pen, but through the pen. Then you'll see the effect.

This might help.....

Pick a spot on the monitor screen as near the centre of the screen as you can (a word, a smiley, a dead fly..etc)....this is your 'target'. Sit comfortably and look straight at this point with both eyes - as normal.

Now, close your left eye and hold the pen about 20cm away from your right eye so it covers your particular target. Do not focus on the pen if possible, keep looking straight ahead as if you were able to see your 'target'.

Now open your left eye and you should see your target and a ghostly pen super-imposed on top of it. Both target and pen appear right in the middle of your field of vision despite the pen, in reality being offset to the right. Such is the principle of the Revi.

Originally Posted by klem

...because I don't believe fighter pilots would be called upon to lean over to see the reticle. The offset was intended to help them not hinder them.

If someone can think of a single advantage to requiring a pilot, strapped tightly into a high performance fighter aircraft to start leaning over just to be able to see his gunsight, I have yet to hear it.