Again, check out the article in Digital Photo Pro this month. I was part of the, "well I can do this in PS" school since I got my first digital. I've changed that opinion after seeing the difference between on camera filter and photoshop.
Keep in mind, every time you use PS, you are moving digital data around. The stronger the filter effect you seek, the more data you move in the image. Which makes sense when you think about. In the side by side image comparisions you can actually see a difference. Interestingly I noticed the diff the most when I made photocopies for my employees. The images altered in PS were not as smooth in black and white reproduction as the ones with filters. Again, non scientific test, your mileage might vary. :)
Do I have a full set of filters? Nope. But based on the article and some other things I've read online, I try to do as much alteration as possible before I go into the darkroom. That means correct color, correct exposure, and in focus shots. I've seen good evidence that I should not be without a polarizer, ND set, and possibly a couple of fun Cokin filters.
Am I running out today to get these filters? Nope. Cause right now I can get by in PS. But they are sure as heck on my list.
Clara
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