#58A och #80A

Serves as a great resource for astronomy lectures and star parties

Objektivdiameter: 86 mm

men följande är de vanligaste användningsområden för olika färgfilter:

Kvävefyld

Solar History - An Introduction Size:EN STL #58A och #80AEn introduktion till solens historia. Solar History An Introduction Frfattare: Claudio Vita Finzi Beyond the four centuries of sunspot observation and the five decades during which artificial satellites have monitored the Sun that is to say for 99. 99999% of the Sun's existence our knowledge of solar history depends largely on analogy with kindred main sequence stars, on the outcome of various kinds of modelling, and on indirect measures of solar