Ernie Aubert
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 p.1 #5 · Polarising filter question | |
Circular polarizers are almost a must for landscape photography, and are really good in many circumstances. But as was mentioned, as with any filter, it's very important to use only the highest quality.
There two opposing camps regarding using a filter to protect the lens. One group point out that any air/glass interface through which the light reaching the sensor has to travel will necessarily degrade the quality, however minutely; and that apart from those interfaces, there's the effect of having to pass through the material itself, which in the case of the lower quality filters is probably worse than the air/glass interfaces.
The other group considers all that, and elects to use something, the best they can afford and justify, to protect the front element of the lens, some or all of the time. Many have had the experience of being very glad they'd done so when something impacted the filter, enough to have damaged the glass, but without having touched the lens itself.
Some have a foot in both camps...
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