NavList:

Hello all,

I have a Davidson optronics autocollimator with a strange quirk. I called Davidson and asked if they could calibrate it. They declined and stated this autocollimator could not be calibrated.

This model has a lit grid screen that sits askew in the field of view. (Google askew, I assume that is a Google joke.) The first mirror the light path hits is adjustable. The adjustment is similar to the three screw Dobson main mirror adjustment. It then hits a prism with a lens glued to the top, leaves the prism and hits a second lens, then it hits two more 45 deg prisms and ends on the lit grid screen. Adjustments I have attempted, rotating grid screen in mount (does not help), systematically adjusting the first mirror (this seems to only help center on the lit grid). If I focus past infinity, I can see the back of the prism (it seems a little off line but vertical). The prism is hard mounted with no adjustment. If I run through the focus range I can count all the surfaces the light bounces off. Please suggest any possible ides to why the grid is askew.

Thanks

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