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Don't check for Moiré patterns until you're looking at an image file at 1:1 pixel size. Moiré patterns can appear on top of a perfect photo whenever the image is naively downscaled without gamma correction. This also happens within the camera display - any Moiré visible while shooting does not necessarily need to be corrected.

There's nothing wrong with choosing to blur out the grill pattern - the photos probably represent the original display signal more accurately.

> There's nothing wrong with choosing to blur out the grill pattern - the photos probably represent the original display signal more accurately.

But if you want to capture the signal as opposed to how it looks in a real CRT then this is really a roundabout way to do it.

If you use a camera with shake reduction system like a Pentax DSLR, it has a function to shake the sensor slightly to avoid Moiré.

A more tedious, but bullet proof way to avoid moiré is to take an image of the moniter using a camera with photographic film.

A Guide to CRT Photography