Join Ben Long for an in-depth discussion in this video Some shooting tips for working with a polarizing filter, part of Foundations of Photography: Specialty Lenses.
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Now, while there's not much to using a circular polarizer--you just turn it until the image…looks right--there are still a couple of things to bear in mind.…A lot of people think, I'll just put the circular polarizer on my favorite lens and just leave…it there and then I'll always have it.…I don't really recommend that because you're going to forget that it's there, and it's…going to be set to a certain level of polarization, and you're going to take your shot and maybe…that level of polarization will be good for your shot, maybe it won't, but you're probably…not going to remember to adjust it.…So it's better to put it on when you're in a situation where you think you need it.…
The polarizer also is going to cut some light.…Depending on how you have it set, it may require more exposure that could have serious impact…on your motion-stopping power or your depth of field depending on what you're trying to do.…You can compensate for that with ISO.…It's not going to be a lot, but it's still something to be aware of, and that's another…
The course begins with a look at several common and inexpensive lens attachments, from polarizers to neutral density filters. The course then explores ultra-wide angle and fisheye lenses as well as ultra-long telephoto and macro lenses. The course concludes with a look at tilt-shift lenses, which are useful for architectural photography and special effects, and at offbeat lenses, such as Lensbaby and Holga attachments.
The course also contains Photoshop postproduction advice and examples that illustrate the creative possibilities that an expanded lens collection provides. And because some specialty lenses are extremely expensive, the course also contains advice on renting gear.