Alpine Astronomical 200mm ASTF Baader AstroSolar 5.0 White-Light Solar Filter for Telescopes

BH #ALASTF200 • MFR #ASTF-200
Alpine Astronomical
Alpine Astronomical 200mm ASTF Baader AstroSolar 5.0 White-Light Solar Filter for Telescopes
Key Features
  • Safe Solar Viewing with Nighttime OTAs
  • For Detailed, High-Magnification Viewing
  • Broad-Band Neutral-White Color
  • Optical Density of 5.0
Unlike many white-light solar filters that produce views of the sun with a red-orange, bluish, or yellow tint, the Alpine Astronomical 200mm 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.
Temporarily Out of Stock
Expected availability: 2-4 weeks
$147.00
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 ASTF-200 Overview

Unlike many white-light solar filters that produce views of the sun with a red-orange, bluish, or yellow tint, the Alpine Astronomical 200mm 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 190-210mm, the filter is engineered with three centering bolts that can fit OTAs, dew shields or corrector plates with an outside diameter of 220-260mm, or an inside diameter of 250-290mm. 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.

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 190-210mm apertures
  • 250-290mm inside diameters
  • 220-260mm outside diameter

Alpine Astronomical ASTF-200 Specs

BandpassWhite-light, broadband
Clear Aperture200mm
Diameter290mm
Weight7.3 oz / 207.0 g
Packaging Info
Package Weight1.23 lb
Box Dimensions (LxWxH)13.3 x 13 x 1.3"

Alpine Astronomical ASTF-200 Reviews

The sun is white!

By Levent
Rated 5 out of 5
Date: 2020-11-05

You need to put together some screws, bolts and straps to make the filter ready for use. All the necessary items are provided in the box and it is easy. The filter fits well to my Meade 8 inch LX90 scope. It is possible to use it in wider scopes using the adjustments. It shows the sun in natural white color. I attached some quick images that I took by phone but actual images are much better. Sunspots give very good contrast and observing sun is a pleasure with this filter. I would buy it again.

Love it!

By Paul
Rated 5 out of 5
Date: 2019-11-26

Easy to set up and works great. Saw the transit of Mercury with it in perfect clarity.

White filter

By peter
Rated 5 out of 5
Date: 2019-11-15

Very good choice. It is Alpine Baader Planetarium so quality is prime.... fast B&H delivery.

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