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Monte Umbe (Mauretonio), 1973. Normon Fisher, Keith Brockenbarough ond Morgoret Rumsby demonstrote black gloss reflection technique. (Michael Mounder) (UV) and infrared (IR) radiation. Use only solar filters that remove both UV and IR radiation. UV radiation is not always considered in solar filter choice. It should be. UV exposure can lead to similar effects as sunburn; you are unlikely to absorb enough radiation to end up with cancer, but corneal cataracts are a strong possibility with prolonged usage.

They are produced to extremely precise optical specifications and guarantees backed by International Standards' tests. Another problem is that virtually nobody makes these above 50 mm square, 25 mm being the industry standard. If this is big enough, use them because of their guaranteed pedigree. Stainless steel filters are produced by at least one American company giving a six-year guarantee. The technology is now sufficiently mature for a "second generation" filter. This is claimed to be a triple layer of stainless steel on chromium on top of nickel.

Some companies also offer varieties for monochrome or colour film. Whilst not suitable for use on their own for solar work, they can be combined with a standard Inconel filter for a rapid survey of solar activity and potential prominences at eclipse time. Some other very stable filters have been made which reject all but a narrow wavelength. These "light rejection" filters are usually quite small, and because they are fitted at the eyepieces are totally unsuitable on their own for solar work. g.

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