The Filters We Need With Digital...

Started Oct 5, 2008 | Discussions thread
Bob Sal Senior Member • Posts: 1,529
Re: The Filters We Need With Digital...

A more complete list of filters for digital cameras would be:

1: UV filters. The optics and sensors in a digital camera do not completely block all UV and a loss of sharpness due to UV rays as well as the bluish tints in distance scenes (especially at altitude) are eliminated by using a UV filter.

2:Protection filter. Absolutely crystal clear glass with no color (other then the coating) to protect the lens from damage from blowing sand and dust and smoke, fingerprints, etc. While a hood may protect from oblique directions a filter protects from damage from things coming directly towards the lens.

3: Skylight filters: Adds a pleasing warmth to shots when desired.

4: Polarizing filters. Normally circular for DSLR type cameras.

5: ND filters to reduce the overall amount of light in a scene (a polarizing filter can be used if it blocks the desired amount of light.

6: Graduated ND filters. To selectively reduce the amount of light to bring the scene into an acceptable contrast range.

7: IR filters. To photograph scenes or objects under IR radiation.

8: UV filters. To photograph scenes or objects under UV radiation.

Both of the above types are opaque to the human eye and the camera must be used on a tripod.

9: Digital filter. Camera sensors are effected by both UV and IR radiation. The Digital filter blocks both types of radiation and passes only visible light. This results in cleaner blacks, whites, reds, blues, browns, etc. Its' use results in greater separation between colors (easily seen on a histogram). This filter also totally eliminates the "M8 bug". It can not be used with lenses shorter then 28mm. It works thanks to its' dichroic coatings and is not made from a special type of glass.

10: Close-up lenses. To shorten the focal length when your lens will not let you focus close enough. Better methods with a DSLR are by using extension tubes or bellows but those will require an exposure change.

Other useful lens gadgets are:
Step-up rings to allow one size of lens accessory to fit all lenses.
Lens caps
White balance caps

Special effects filters (double exposure, fog, soft focus, etc. (many of these effects can be done in post processing but it is faster to do it at the time of shooting).

An effective lens hood. A lens hood that does not vignette at a lens' widest focal length is not providing any protection at the longest. Conversely a lens hood that works effectively for a long focal length will vignette with a wide focal length.

To overcome this either an adjustable hood or a compendium bellows lens hood is required.

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