What is the best all-purpose filter for DSLR camera?
The quality of photography remains determined by the gear and accessories, the camera and the lenses, and the skill of the photographer in putting it all together. One integral piece of accessory is the light filter. So, what does the filter do and why do we need it?
Work of the filter
The light filter is a device to control the amount of light that strikes the sensor. Before we proceed any further, you must know that we have three kinds of filters. One is the Neutral Density (ND) filter, the second is the ultraviolet (UV) filter, and the third is the polarizing filter. You can call the ultraviolet filter as a skylight filter. It helps protect you in all weather conditions, so you can shoot the photograph without any damage to the picture.There is no all-purpose filter for a DSLR camera.
Then again, we have round filters and square filters. This is only a physical aspect and does not do anything technical for the photograph. That said, the main use of the skylight filter is to protect the front end of your camera. It keeps the dirt and damage off from the camera. The round or screw-in filter finds use when you have only one lens (or have many lenses with the same size thread). So, if you have lenses with different threads, you will need more than one filter.
Use of a square filter
If you think of the square filter system, you attach the lens through the adaptor system. Since you can attach lenses of different sizes to the adaptor with ease, you only need one square filter. The skylight filters have the best applicability with round screw-in design while the neutral density lenses have more use with a square filter.
Often, you shoot in wet, muddy conditions and this is the time to keep the front filter on all the time. It helps protect the hand to replace front end of the camera from all the environmental elementals. The functional aspect of the UV filter or the skylight is to reduce the glare due to the open sky, the open expanse of water, and screen some of the UV rays out, so the picture does not have a glare.
Change to DSLR filters
You can see a pink cast on the photograph when you use the skylight filter. When they designed the filters, the camera film used to have a blue cast. The pink tint of the filter was to neutralize this. But, with the DSLR cameras, this is not an issue. Next, it is the polarizing filter. This reduces reflections (read reflected light) from metallic objects and increases the colour saturation. So, why not do this with Photoshop?
You have a limit to what you may do and may not do with Photoshop. Instead of spending endless hours with Photoshop trying to get the desired effect, you can use a filter and get a wonderful effect. These polarising filters come with a rotating mount. The effect varies as you turn the filter. The neutral density filter cuts down the amount of light entering the lens. Though it reduces the light, it will not affect the colour.