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Oxygen III (OIII): FWHM 5nm
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Light pollution filters do not eliminate the effects of light pollution or increase the object’s brightness
resulting in an impressive f/5
for imaging birds
Baader AstroSolar® ECO-size Safety Film 5.0 - Solar Observation Film pattern Oxygen III (OIII): FWHM 5nmAstroSolar ECO size Safety Film 5. 0 For solar observation and photography at high magnification. Size: approx. 140 x 155 mm, includes DIY instructions and cutting template. This film is telescope quality with an Optical Density (OD) of 5. 0, making it safe for visual solar observation with additional optics and imaging. This high precision film consistently achieves strehl ratios of 94 96% in interferometric tests, performing optically similar to a
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