ALPINE ASTRONOMICAL 120mm ASTF Baader AstroSolar 5.0 White-Light Solar Filter for Telescopes

ALPINE ASTRONOMICAL 120mm ASTF Baader AstroSolar 5.0 White-Light Solar Filter for Telescopes

ALPINE ASTRONOMICAL 120mm ASTF Baader AstroSolar 5.0 White-Light Solar Filter for Telescopes

B&H # ALASTF120 MFR # ASTF-120
Special Order
Expected availability: 7-14 business days

Product Highlights

  • Safe Solar Viewing with Nighttime OTAs
  • For Detailed, High-Magnification Viewing
  • Broad-Band Neutral-White Color
  • Optical Density of 5.0
  • 110-130mm Recommended Aperture
  • Front Clear White IR-Rejecting Ring
  • Three Centering Bolts and Safety Straps
  • No Tools or Modifications Required
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SAFETY FIRST: Observing the Sun without the proper protection may result in serious personal injury, including permanent eye damage and blindness, and/or damage to equipment. Never point an optic at the sun without an approved solar filter on the front of the optic. For direct solar viewing, viewing the sun through an optic, or when using cameras with an optical viewfinder, ensure your filter is ISO 12312-2 (also written as ISO 12312-2:2015) certified. Never use photographic neutral density filters for direct solar viewing, viewing the sun through an optic, or when using cameras with an optical viewfinder.

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  • 1Description

Unlike many white-light solar filters that produce views of the sun with a red-orange, bluish, or yellow tint, the Alpine Astronomical 120mm ASTF Baader AstroSolar 5.0 White-Light Solar Filter reveals the sun in its natural white color. With an optical density of 5.0 for safe solar viewing though an optic like a telescope or spotting scope, the filter shows more surface details with greater clarity versus other types of solar filters. The filter is mounted onto a clear-white IR-rejecting plastic ring, which acts as a stabilizing element for the filter cell, and the ring is in turn mounted onto the aluminum front frame. The thermal expansion coefficient of the plastic and the film are similar to minimize thermal stress on the film for increased resistance to developing pinholes or tears.

With the ability to be installed on the outside or inside of an optical tube assembly, dew shield, or corrector plate retaining ring, this filter provides a safe way to view the sun through conventional nighttime telescopes. Recommended for apertures from 110-130mm, the filter is engineered with three centering bolts that can fit OTAs, dew shields or corrector plates with an outside diameter of 140-180mm, or an inside diameter of 170-210mm. Due to the shallow depth of the corrector plate on most catadioptric OTAs, for secure and safe use, Alpine Astronomical only recommends outside mounting on Cassegrain-style telescopes.

  • For the correct fit, measure the outside or inside diameter of the dew shield/lens housing - including hardware like retaining rings and screw heads - and choose the size that matches the measurement with some extra room
  • When used on Schmidt-Cassegrain, Maksutov-Cassegrain, or other catadioptric OTAs, outside mounting is required as the limited depth of the front inside diameter prevents full and secure engagement of the centering bolts
  • Recommended for 110-130mm apertures
  • 170-210mm inside diameters
  • 140-180mm outside diameter
In the Box
ALPINE ASTRONOMICAL 120mm ASTF Baader AstroSolar 5.0 White-Light Solar Filter for Telescopes
  • 3 x Screws
  • 3 x Washers
  • 3 x Centering Bolts
  • 3 x Rubber Plugs
  • 3 x Safety Straps with Adhesive Pads
  • Limited 2-Year Warranty
  • Table of Contents
    • 1Description
    Bandpass White-light, broadband
    Clear Aperture 120mm
    Diameter 210mm
    Weight 5.5 oz / 155.0 g
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