By Jurgen Rendtel.
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Extra info for Handbook for photographic meteor observations
1978: The Innisfree meteorite and the Canadian camera network. J. Roy. astr. Soc. Can. 72, 15–39. , 1985: The Grande Prairie Fireball of 1984 February 22. J. Roy. astr. Soc. Can. 79, 197–214. , 1988: Geminid fireballs and the peculiar asteroid 3200 Phaethon. Icarus 76, 279–294. T. , 1984: The frequency of meteorite falls on the Earth. Science 223, 1405–1407. Halliday I. , 1982: A study of the relative rates of meteorite falls on the Earth’s surface. Meteoritics 17, 31–46. , 1974: A meteorite that missed the Earth.
17, 195–206. , 1967: Meteor spectra. ): Physics and Dynamics of Meteors. , 73–83. , 1971: Spectral data on terminal flare and wake of double-station meteor no. 38421 (Ondˇrejov, Apr. 21, 1963). Bull. Astron. Inst. Czechosl. 22, 219–304. , 1973: Evidence from spectra of bright fireballs. ): Evolutionary and Physical Properties of Meteoroids. Washington (NASA SP-319), 89–102. , 1963: Meteor spectra with high dispersion. Smithson. Contr. Astrophys. 7, 129–153. , 1965: Een automatische Meteoorspektrograaf.
Some small grains that have collected on the lens could be silicates, and thus of comparable hardness to the glass itself and certainly far harder than the protective layer. Besides damage to the reflection-reducing layer each scratch increases the amount of stray light entering the camera. These are the reasons for being extremely careful when cleaning the lens. As a rule, a small amount of dust on the front lens has less effect than any scratches. However, from time to time you must clean the optics.