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8. Calibration > 72. Focus Your Front Projector

Focus Your Front Projector

Focus on a front projection system is just as important as it is on an RPTV, but the steps to get there are completely different.

Focusing a front projection CRT is a daunting task because it involves two projection systems that operate in series: an optical and beam focus.

Problems with one type of focus make it difficult to see problems with the other. As a result, sometimes people are at a loss as to which system is the problem. Add to that the need to astigmate the electron beam and adjust lens flapping (scheimpfluge [Hack #70] ), and the novice CRT setup can fall far short of the projector’s optimum.

Tip

New owners confuse the two, but mechanical aim isn’t the same as scheimpfluge. Mechanical aim of the CRT/lens assembly is the same as taking a telescope and physically pointing it at something. Scheimpfluge is adjusting the mounting angle of the end lens without changing where the telescope is pointed.


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