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What is the most useful viewing material for you? Why?​

Sagot :

09303638245

Answer:

Choosing a Color/Planetary Filter

Explanation:

There are many different types of optical filters available today - some are used in photography or video, and others are made specifically for visual use. But in each case, the filter is designed for one purpose: to block certain frequencies of light, while allowing other frequencies to pass. The filter's ability to pass only certain frequencies can greatly enhance the observer's ability to discern small details on some solar system and deep sky objects. Special Light Pollution Reduction (LPR), Broadband, and Narrowband filters are designed for observing DSOs. For observing the Moon, Mercury, Venus, Mars, Jupiter, and Saturn, colored filters are the most useful.

The first colored photographic filters were invented by Fredrick Wratten (1840-1926), and the color numbering system he developed is named after him - Wratten Numbers. Wratten sold his company to Kodak in 1912, which continued to make "Wratten Filters" for decades. Today, colored filters for astronomical observing still use the Wratten numbering system.

One of the most frequent questions about the use of colored filters, is "Which filter should I use on which planet?" There are some general guidelines, but because everyone's eyes are slightly different, and the colors of the planets are subtle and continually changing, each observer will need to discover which filter works best for them in specific situations. Also, many filters can be stacked together so the possibilities are endless.

The table below outlines some suggestions for solar system observing using colored filters. It covers the most popular of the colored filters. Following the table are descriptions of each of the filters, including some more detailed recommendations.

Tip: Consider the aperture of the telescope you will be using with the filter. The smaller the aperture, the lighter the color you should use. As a general rule of thumb, dark colored filters should be reserved for use with apertures of 8" or larger. Also, since filters can be stacked, there are many possible combinations; but again, stacking multiple filters works best with larger apertures.

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