Their use permits a wider working aperture and/or long exposure times under bright light conditions. They are useful as they reduce the amount of exposing energy. The next most valuable is the neutral density filter. It does this without changing the color of the vista. The polarizer darkens blue sky causing the white clouds to stand out, thus enhancing the contrast and saturation. The second is called a retarder that de-polarizes, thus avoiding interference with automation tasks. The circular design is two filters sandwiched together. Because the modern camera likely utilizes a polarizing filter for auto-focus and perhaps light metering, use of the linear type is unadvisable (may or may not interfere). Most sold today are circular, however the ones purchased at swap meets are likely linear. Polarizing filters come in two flavors, linear and circular. When using one, you select a favorable camera to subject angle of view and rotate the filter for the desired effect. This filter mitigates reflections from certain surfaces (mainly non-conductors). The most valuable filter is likely a polarizer. This negates mounting a UV filter except for protecting the mounted lens from damage via scratches etc. The digital sensor’s surface is protected by a cover glass that is also a UV filter. Depending on what the cost of the set of 3 filters is, you might consider just getting a good polariser, but that's up to you.īoth film and the digital sensor are highly sensitive to UV light. The polariser is very useful and the ND filter can be useful at times.
The UV filter doesn't really serve any purpose on a digital camera other than possibly protecting the lens if you drop it. That would screw into the 18-55mm lens and allow you to fit the same 58mm filters onto that lens as well. And then also buy a 52mm-58mm step-up ring. The other option is buy a 58mm filter set which will work on the 50mm lens.
For typical landscapes wider focal lengths are useful, and you can often use a tripod and don't need a fast lens or narrow depth of field that you get with the 50mm prime. But the 18-55mm covers a range of focal lengths including 50mm, so you could just use that lens for all your landscapes. The 18-55 is a versatile lens, so you could buy the smaller 52mm filter set for that lens, but the filters will be too small to work on the 50mm lens. The 18-55mm lens has a filter size of 52mm
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