Quote:
Originally Posted by Merlin66
Unless you have the eyes of a ten year old, it's very difficult to see much at the CaK wavelength...
I'd remove the side cover from the black box and check if the focusing pentaprism is moving with the focus knob.
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If you decide to remove the side cover as Ken suggests, check that the prism is at right angles to the light path as it is only held on with silastic and can move over time. The side plate cap screws can be a bother to remove as they are usually "loctited". I'd suggest jerking the allen key rather quickly in the anti-clockwise direction to break the bond.