 Douglas Robertson |
Using more than one filter I have just bought a polarized filter and I am assuming it is okay to keep my uv on top of it to protect the polaried filter? Also, do you get different degrees of polaried filters (i.e. will some take more glare of the water, make the sky appear more blue than others) or are they all pretty much the same? Thanks.
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Jon Close |
There is little or no need to use the UV filter for protecting the polarizer. Stacking filters can lead to vignetting, where the extension caused by the filter rings cuts light to the corners of the film frame. There should be no difference in the polarizing effect between 2 well made filters, though a cheap filter without coatings will be more subject to flare.
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Bill McFadden |
If you use the Canon EOS system, stacking filters might damage the len's internal motor. Poralized filters generally have an front element that rotates to allow you to control the effect of the filter on the image. If you buy a poralizer filter, you may want to check your camera's manual to see if you need a circular filter or can use a the less expensive kind, which is, if I recall correctly, a linear filter.
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Jon Close |
>>"If you use the Canon EOS system, stacking filters might damage the len's internal motor."<< This is far too general a statement to let stand. First, most Canon EF lenses have internal focus, so mounting 1 or a stack of 10 filters has no effect whatsoever on the focus mechanism. For the few cheaper lenses that focus by rotating the front element to which the front filter attaches, the additional weight of 1 or 2 filters is not enough to cause any undue stress on the focus motor or gearing. However, for those lenses that do have a rotating front element you should exercise care when screwing a filter on or off. You should avoid turning the lens front while the autofocus mechanism is engaged, otherwise the gearing may be forced or stripped. This applies not only to the EOS line, but to Nikon, Minolta, and Pentax, as well as lenses for each system made by Sigma (Quantaray), Tamron, Tokina, Phoenix, Promaster, Vivitar, etc. If the lens has a rotating front element, switch to manual focus before putting a filter on or off, or hold the front of the lens still while changing filters. No worries with lenses with internal focus and/or non-rotating front elements. Take care with autofocus lenses with rotating front elements.
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