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AstroZap Baader Film Solar Filter for ETX 125 and 136 mm - 146 mm Telescopes Owners of the ETX125 or telescopes with an outer diameter of 136 mm to 146 mm will be wowed by this AstroZap Baader Film Solar Filter. The Baader AstroSolar film makes this filter a great choice for anyone interested in viewing the Sun. Supported by Germany's National Bureau of Standards for eye safety, the AstroZap solar filter will protect your eyes from the Sun's harmful rays. Watch a solar eclipse or observe sunspots on a sunny day with AstroZap's Baader Film Solar Filter!

Astrozap mounts the AstroSolar film in an aluminum cell. To install, you simply slide the filter cell over the end of your telescope and tighten the three thumbscrews so that the filter is firmly attached to your telescope. With the filter securely in place, you can look at the Sun through a standard eyepiece. Just remember not to look through your finderscope unless it has its own little filter installed! Most observers remove their finder altogether so as not to be tempted in the first place since it is relatively easy to center the Sun in your eyepiece once you've learned a trick or two.

When viewed through an Astrozap solar filter, the Sun appears neutral white. Other films and some glass filters produce a blurry bluish or reddish solar image, thereby cutting out part of the spectrum. Especially with an orange sun, it is very hard to see faculae regions which are visible predominantly in the blue part of the spectrum.

Due to its neutral color balance, the use of an Astrozap Baader Solar Filter enables the use of various color (or interference) filters, allowing the observer to concentrate on certain spectral passbands for investigations of different layers within the solar "atmosphere".

Eye safety

AstroSolar™ is essentially free from pinholes, since - other than with even the most expensive glass filters - it is coated on both sides so that the chance of two pinholes overlapping each other is extremely faint.