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[quote=Anonymous][quote=Anonymous]I am also a professional photog and would NEVER use a lens without a filter.  It protects your lens, which is the most important piece of equipment a photographer buys .  Always buy good glass, and always use a filter.  [/quote]

Like I said, it's a religious debate.  The fact that there are Jews doesn't invalidate Catholicism.  The fact that you obviously feel very strongly about the issue is only further evidence that the debate will always rage.

I'm fairly neutral.  But just to play devil's advocate, why would you spend $1000 on a lens, then stick a $20 optical element in front of it?  Use a lens hood.

[quote]No matter how expensive or how well coated, filters inescapably degrade the optics of any camera. Filters reflect a small amount of incoming light out of the camera and invite the unwelcome internal reflections known as flare. Flare can be as conspicuous as a series of UFO-like hexagonal blobs of light hovering in the sky or as subtle as a loss of color saturation. With any filter in place, meticulous shading of the lens becomes mandatory. If they're not perfectly flat and parallel to the image receiver, filters can also introduce aberrations. Stacking filters only compounds these problems, but a purely protective filter constantly swapped out for another serving a real photographic purpose quickly becomes a nuisance.

Light loss and aberrations seldom reach practical levels, but flare's a fatal image flaw, and a common one at that, especially when the sun's low in the sky near your subject. Why compromise on quality when careful handling, a lens cap or a rigid lens shade provide adequate protection under most shooting conditions?[/quote]

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