Dirty Sensor - To check your camera sensor for dust, here are a few simple steps to take. Set the ISO @ 100 or the lowest setting. Set the aperture to F/22 or higher. Turn off the anti-shake or any other image stabilizing feature. Take a picture of a grey card, a light colored even surface, or blue sky. Move the lens around during the exposure. Be careful not to over-expose the shot or you won't be able to see the dust. Take a few different shots just to be sure. View the images on your computer. Increasing the contrast shows any dust spots.
Filters on DSLRs with "APS" size sensors - If you're using a full-frame lens on a DSLR with a 1.5x or 1.6x sensor, you can probably use a step down ring and a smaller diameter filter and not have vignetting. For example, a common filter size on lenses is 77mm. If you can use a step down ring and say 62mm filters, you'll save a lot of money. See if a local camera store will let you try out various step-down rings and smaller filters to determine what combination works for your lens.
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