Alpine Astronomical 100mm Baader AstroSolar BDSF 3.8 White-Light Digital Solar Filter for Telescopes

BH #ALBDSF100 • MFR #BDSF-100
Alpine Astronomical
Alpine Astronomical 100mm Baader AstroSolar BDSF 3.8 White-Light Digital Solar Filter for Telescopes
Key Features
  • For Digital Imaging with Nighttime OTAs
  • For Detailed, High-Magnification Viewing
  • Broad-Band Neutral-White Color
  • Optical Density of 3.8
Unlike many white-light solar filters that produce views of the sun with a red-orange, bluish, or yellow tint, the Alpine Astronomical 100mm Baader AstroSolar BDSF 3.8 White-Light Digital Solar Filter reveals the sun in its natural white color. With an optical density of 3.8, this iteration is specifically designed for digital imaging of the sun and all phases of a solar eclipse through an optic like a telescope or extreme telephoto lenses — showing 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 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.
More on the Way
Expected availability: 2-4 weeks
$104.00
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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Alpine Astronomical BDSF-100 Overview

Unlike many white-light solar filters that produce views of the sun with a red-orange, bluish, or yellow tint, the Alpine Astronomical 100mm Baader AstroSolar BDSF 3.8 White-Light Digital Solar Filter reveals the sun in its natural white color. With an optical density of 3.8, this iteration is specifically designed for digital imaging of the sun and all phases of a solar eclipse through an optic like a telescope or extreme telephoto lenses — showing 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 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 90-110mm, the filter is engineered with three centering bolts that can fit OTAs, dew shields or corrector plates with an outside diameter of 120-160mm, or an inside diameter of 150-190mm. 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.

This filter is only intended for digital imaging of the sun, and is not safe for direct solar viewing or for use on cameras with an optical viewfinder. Only use on cameras with an electronic viewfinder (EVF) or Live-View option. If you do not know what kind of viewfinder your camera has, do not use this filter.

Fit

  • 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 90-110mm apertures
  • 150-190mm inside diameters
  • 120-160mm outside diameter

Alpine Astronomical BDSF-100 Specs

BandpassWhite-light, broadband
Clear Aperture100mm
Diameter190mm
Weight5.3 oz / 150.0 g
Packaging Info
Package Weight0.6 lb
Box Dimensions (LxWxH)9.4 x 9 x 1.3"
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Dose this fit Sigma 150-600MM sport ?

Dose this fit Sigma 150-600MM sport ?
Asked by: Anas
This one is too small. The correct one would be BH# ALBDSF120
Answered by: Steve
Date published: 2020-01-10

Hi, any idea if this filter can fit Sigma 150-600 ...

Hi, any idea if this filter can fit Sigma 150-600 with 95mm filter thread? Any other recommendations for solar photography?
Asked by: Anas
Yes the Alpine Astronomical 80mm Baader AstroSolar BDSF 3.8 White-Light Digital Solar Filter will fit the Sigma 150-600 Contemporary lens. It can be used with any lens or telescope that has an outside diameter in the 100-140mm range.
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Date published: 2020-01-23
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