ordered some filters

I am a newbie at photography and have a Nikon D40x. I wish I have the time to go out and take good pictures like what you have planned in mind. I also plan to buy accessories when I have more time for this hobby. Enjoy your camera and new accessories. Hope you get good shots.

i know that polarizer filter will give effect on sky . i mean the color, it will be more saturated . hehe

YAY! I'm glad you have some new filters now. Good luck with them.

An UV filter has an effect so subtle you will hardly notice it. They are usually used as a protection for the front element of a lens (mounted and left all the time on the lens), not because of the effect they cause.

The only two filters that have effects that cannot be mimicked artificially using Photoshop are the "polarizing" and "neutral density" filters.

The polarizer has indeed an effect on color saturation (most noticeably, it darkens the cyan of the sky while keeping the clouds white). But the more important effect it has is that it can diminish reflections on reflective surfaces (such as water, windows, etc.) When doing landscape photography, in particular, it helps to have more punchy pictures, better foliage, etc. The effect works at its best when the camera is oriented at 90 degrees from the sunrays, and diminishes as you get closer to 0 or 180 degrees.

I would not use this filter inside or otherwise in low light, as it will cut light by 3 (or about 1.5 stops). I would not use it in every other circumstance neither -- for example, you wouldn't want to do portraits with it and end up with very unnatural skin tones. (Well, actually, you can, but the result will be more artsy than realistic.)

With autofocus cameras, you need to use a*circular* polarizer (as opposed to a linear polarizer), otherwise the autofocus functionality will be erratic/non-working.

The neutral density filter's only goal is to cut light while not affecting the image otherwise. Why would you want to do that? There are a few special circumstances under which you may want to do it. First example, say you want to make a long exposure, but there is so much light (usually in midday sun) that it is not possible even using the lowest ISO and by stopping down the aperture. Second example, say you want to make a picture using a very large aperture (likely to benefit from the thin depth of field, to have the background be less of a nuisance) but there is too much light to do so...

Various neutral density filters are sold, depending on the amount of light they cut (from a third of a stop to a few stops). Others have gradients of density, which are used when a part of the frame is lighter than another (such as a sunset) -- but HDR techniques using composition in Photoshop are actually doing a better job at this, albeit with much more effort.

Hope this helps...

Very cool!!! I love using filters!!! I have all kinds... polarizers, macro, gradual color, star, ND, infrared... Being able to use different filters really adds a whole new element to your photography! Enjoy testing out your new filters!:)