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Baader Planetarium 100mm AstroSolar Telescope Filter

SKU: AA2459311 MFR: ASTF-100
$95.00
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Key Features

  • Observe the sun safely with this 100mm AstroSolar telescope filter for detailed views.
  • Enhance image contrast during solar observation using this high-quality telescope filter.
  • Explore solar details with this white light filter, perfect for visual and imaging use.
  • Reduce light pollution and glare for clearer solar views with this telescope accessory.
  • Enjoy safe solar viewing; this filter uses durable AstroSolar Safety Film for protection.
  • Achieve optimal filter transmission for stunning solar images with your telescope setup.
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Special Order?Estimated to Ship: 08/19/2025
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Questions & Answers

Shopper : Why Did You Choose This?RUSTY M : I've heard only good things about the Baader ASTF filters.

Reviews about this item

Review Summary

2021-05-24T13:13:40

Rated 5 out of 5

Great item for both visual and photography of the sun through your telescope.

Very well made product that fits my Celestron 7" Maksutov perfectly.

ROBERT F.

2018-09-28T16:37:58

Rated 5 out of 5

Good quality filter

it fit my celestron 127slt like a glove. the sun is white in this filter and it is neet to look at the sun spots and solar flares. I wanted something quality so I didn’t hurt my eyes and this did the trick .

brady s.

2018-09-20T13:50:36

Rated 5 out of 5

Easy, inexpensive solar filer

Easy to use and very inexpensive, works fine.

GARY S.

2017-09-01T07:25:06

Rated 5 out of 5

Bought for the 2017 Total Eclipse!!!!!!!

I purchased this filter after reading many reviews. I used it for the Total Solar Eclipse a couple weeks ago. It was awesome. The filter provided great visual images. I didn't try any photography with it this time fort I'm still trying to figure that part out. I used the filter with my Celestron EVO 9.25 and am totally pleased with the performance of the filter. I would definitely recommend this filter to everyone interested in doing some solar viewing.

Wesley P.

2017-09-01T06:29:48

Rated 4 out of 5

Works great, but beware the size and Velcro

I got this filter to attach to my telescope for the 2017 solar eclipse. Optically it performed great and everyone had a good time looking at the sun slowly disappear, at the sunspots, and at the chromosphere for a few short seconds. In addition to being good optically, the filter itself seems to be well made. Where things falls flat though is the mount. Other reviewers have stated that correct sizing is critical so before getting this I measured the tube diameter of my scope under the assumption that this was the necessary measurement. Apparently it is not. A 150mm filter is grossly oversized for a 149mm tube. The 150mm appears to refer to the size of the aperture though which the filter transmits light, while the mounting system is several centimeters larger in diameter. Baader Planetarium does have sizing guide, but it is hard to find. Additionally, the mounting system uses glue-backed Velcro pads that you stick onto your telescope for safety. The idea is nice but the execution here also falls flat. The glue is not particularly well adhered to the Velcro pad and tends to pull off before the Velcro separates. Also, some might not like the idea of having Velcro pads glued onto their scopes, binoculars, or (especially!) telephoto lenses.

JASON G.

2017-08-11T17:32:33

Rated 5 out of 5

Works great on Sigma 120-300mm zoom lens

This was a last minute purchase and I was not sure if it would even fit. Thankfully it fit onto the lens hood of the lens.

DON C.

2017-05-30T10:13:00

Rated 5 out of 5

Solar Filter for Nikkor 200-500 mm Zoom lens

The filter assembly is well made and high quality. It fits the lens perfectly, but just. The only way to attach this particular filter is to install it on the lens hood. It has three rubberized posts that are slightly adjustable to accommodate different dimensions, but the range of adjustment is quite small (approximately 3mm per post). I set my posts set as far inward as possible and in this position it is possible to insert them carefully into the lens hood and force them down until the rim of the filter frame is against the lens hood. There are also three Velcro straps to secure the filter from accidentally coming off. I have taken several sets of trial images and have not noticed any light leakage or occlusion of the sun's disc. I would recommend that anyone considering this filter check the specs carefully to get the correct size for proper fitment. This particular filter would not attach properly to a tulip style lens hood.

Michael E.

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Baader Planetarium ilter Specifications

  • Usage

    Visual solar observation and imaging at high magnification

  • Astrosolar Film

    AstroSolar Safety Film

  • Optical Density

    5

  • Inner Diameter / Clear Aperture

    100mm

  • Outer Diameter

    190mm

  • Filter Mounted

    Yes

  • Outer Clampingrange (10mm Bolts)

    130 - 160

  • Inner Clampingrange (10mm Bolts)

    150 - 180

  • Outer Clampingrange (20mm Bolts)

    120 - 150

  • Inner Clampingrange (20mm Bolts)

    160 - 190

  • Solar Wavelength

    Whitelight (integral light)

  • Weight

    0.68kg (1.5lbs)

  • UPC Code

    4047825033000

About Baader Planetarium ilter

FEATURED REVIEWS

Solar Filter for Nikkor 200-500 mm Zoom lens

By Michael E.

The filter assembly is well made and high quality. It fits the lens perfectly, but just. The only way to attach this particular filter is to install it on the lens hood. It has three rubberized posts that are slightly adjustable to accommodate different dimensions, but the range of adjustment is quite small (approximately 3mm per post). I set my posts set as far inward as possible and in this position it is possible to insert them carefully into the lens hood and force them down until the rim...

View full Review

Great item for both visual and photography of the sun through your telescope.

By ROBERT F.

Very well made product that fits my Celestron 7" Maksutov perfectly.

Be captivated by the celestial wonders with the 100mm AstroSolar Telescope Filter by Baader Planetarium, a renowned name in the world of astronomical equipment. This high-quality filter is designed to enhance your stargazing experience by reducing light pollution and increasing contrast, allowing you to observe planets, stars, and other space phenomena in vivid detail.

The AstroSolar Telescope Filter is crafted with Baader's AstroSolar Safety Film OD 5.0, a product of 15 years of innovation. Unlike many ready-made filters that stretch the filter material, compromising image quality, this filter ensures the AstroSolar film is mounted stress-free, preserving its high precision optical window. This results in a superior viewing experience, even at high magnifications.

The filter is housed in a clear white IR-rejecting front ring with raised edges, designed to protect the solar filter material from any sharp metal edge. It features a user-friendly, no-tool mounting system with adjustable centering bolts, accommodating a wide variety of mechanical tube diameters. The filter also includes non-rotating sliding fasteners made from durable aluminum, equipped with a machined indicator for easy adjustments.

For added convenience, the AstroSolar Telescope Filter comes with an index scale beside each adjustment slot, allowing for fast and repeatable adjustments. It also includes black sliding washers to block sunlight from passing through the filter cell, ensuring optimal viewing conditions.

Safety is a priority with this filter. It includes three security straps to secure the filter cell with Velcro-adhesive pads, ensuring a secure fit in front of the telescope under any circumstances. A warning text is also printed onto the front side of each filter cell, reminding users to read the instructions before use.

The AstroSolar Telescope Filter is suitable for solar observation and photography with all high-end telescopes and extreme tele-lenses. It's designed to retain its excellent optical quality at any temperature, from -30Deg C to +50Deg C, ensuring no astigmatism during winter observation or with temperature changes in summer.

Experience the universe like never before with the 100mm AstroSolar Telescope Filter, a testament to Baader Planetarium's commitment to quality and innovation in astronomical equipment.

Baader Planetarium ilter Features

  • High-quality 100mm AstroSolar Telescope Filter by Baader Planetarium for enhanced celestial viewing
  • Features stress-free mounted AstroSolar Safety Film OD 5.0 for superior image quality at high magnifications
  • Equipped with clear white IR-rejecting front ring to protect solar filter material
  • User-friendly, no-tool mounting system with adjustable centering bolts for various mechanical tube diameters
  • Includes non-rotating sliding fasteners for easy adjustments and black sliding washers for optimal viewing conditions
  • Suitable for solar observation and photography with all high-end telescopes and extreme tele-lenses, maintaining excellent optical quality at any temperature

Warranty Information

This product has a limited warranty of 24 months for parts and 24 months for labor.

Key Features

  • Observe the sun safely with this 100mm AstroSolar telescope filter for detailed views.
  • Enhance image contrast during solar observation using this high-quality telescope filter.
  • Explore solar details with this white light filter, perfect for visual and imaging use.
  • Reduce light pollution and glare for clearer solar views with this telescope accessory.
  • Enjoy safe solar viewing; this filter uses durable AstroSolar Safety Film for protection.
  • Achieve optimal filter transmission for stunning solar images with your telescope setup.

What's in the box:

  • aader Planetarium 100mm AstroSolar Telescope Filter
  • 3x 10x38mm Centering Bolts
  • 3x 20x38mm Centering Bolts
  • 3x Safety Straps with Glue-pads
  • 3x Rubber Plugs
  • Instruction Manual
  • Baader Planetarium Warranty F