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Baader AstroSolar Filter for Spotting Scopes, Small Telescopes, & Telephoto Lenses - 50mm Filter Aperture # ASSF-50

4.8 (9 Reviews) Read Reviews Write Review
Brand Baader Planetarium
Part Number 2459335
Availability

Product Info

Manufacturer Description

ASSF – Baader Solar Filters for Spotting Scopes, Small Telescopes, and Camera Telephoto Lenses

Baader's ASSF line of solar filters permit safe visual observation and solar photography with all types of spotting scopes, small telescopes, or large camera lenses. These are intended for applications for apertures up to 6" where the highest magnification will not exceed about 120x.

ASSF-50 Solar Filter Specifications

  • Item number: ASSF-50 or 2459335
  • AstroSolar film aperture: 50mm (1.97")
  • Outside diameter clamping range (with included 13mm bolts): 55 - 70mm (2.17 - 2.76")
  • Inside diameter clamping range (with included 13mm bolts): 81 - 96mm (3.19 - 3.78"). See additional info below.
  • Suited for aperture range: 40 - 60mm (1.57 - 2.36")
  • Outside diameter of filter cell: 110mm (4.33")
  • Weight: 2.4oz / 68g

Additional Filter Details and Features

  • Made of original Baader AstroSolar Safety Visual Film (ND 5.0), cell mounted, and quality inspected by skilled members of Baader's staff.
  • The AstroSolar filter material is mounted onto a plastic ring where the plastic ring itself works as stabilizing element for the filter cell. This still plastic ring is mounted onto the aluminum front frame. The thermal expansion coefficient of the plastic and the film are similar.
  • Clear white IR-rejecting front ring with reinforcing raised edges along the outer and inner circumference, designed to protect the solar filter material from contact with any sharp metal edge.
  • Includes 3 injection molded centering-bolts with threaded brass inserts to center the filter-cell in front of the tube opening (13mm diameter; 24mm length). This fastening system keeps the filter snugly in place and centers the filter. Each bolt features injection molded rubber grip-faces, shaped to easily slide onto any telescope tube but hard to come off.
  • No tool mounting and adjustment of the centering bolts to fit a wide variety of mechanical tube diameters. Bolts are made to contact the outside of the optical instrument tube for most applications.
  • For some optical items (such as refractor and Newtonian reflector telescopes), you may be able to attach the bolts on the inside of the instrument tube. However, this requires a clear depth of about 20mm on the inside for adequate engagement of the centering bolts which many instruments (like binoculars, camera lenses, and SCT/Mak-Cass telescopes) do not have.
  • Includes non-rotating sliding fasteners made from aluminum that hold the centering bolts.
  • Additional Phillips screws are integrated into the sliding fasteners so that the centering bolts can be firmly fastened with a screw driver if preferred by the user.
  • Index scale provided beside each adjustment slot - adjacent to each sliding fastener - for fast and repeatable adjustment of the filter cell onto different telescope tubes.
  • Black sliding washers supplied to securely cover the full length of the adjustment slots in the aluminum frame – for blocking sunlight from passing trough the filter cell beside the filter area.
  • Three security straps included to secure the position of the filter cell with Velcro-adhesive pads. A safety feature to absolutely ensure a secure fit in front of the telescope under virtually all circumstances.
  • Securely packed in a cardboard box with stiff cardboard inlay for safely shipping the filter; Instruction booklet included.

About Baader AstroSolar Film and Solar Filters

The world's finest objective solar filter material - Baader Planetarium's AstroSolar Safety Film - is now available in a complete range of high-quality mounted Baader Solar Filters. Their innovative design and construction enables each filter to fit a wide range of instruments - from high end telescopes, to spotting scopes, camera lenses, and even special versions to fit binoculars. Each filter is precisely mounted at Baader onto special cells, guaranteeing a stress-free mounting that preserves the full optical quality of the AstroSolar film.

Baader Solar Filters provide a professional and secure solution to observe and image the Sun using AstroSolar Safety Film. Many ready-made filters stretch the filter material like a drumhead in order to make it look like a piece of glass. However, this absolutely destroys the image quality, rendering the film useless for high magnification work. AstroSolar is mounted entirely stress free onto Baader's filters in order to perform like a high precision plane-optical window. Even though it may seem counterintuitive, Baader AstroSolar film must show slight ripples! When the film is put under stress by an improper cell mount, its optical quality is degraded and it performs just like a common coated glass-filter made of untreated float glass.

In its September 2000 issue, Sky & Telescope magazine proclaimed Baader Planetarium's AstroSolar Safety Film to be "the new standard in solar filters." AstroSolar Safety Film delivers white light views of the Sun that are unmatched by any other objective solar filter or material. The views through AstroSolar display fine solar details, including fine penumbral detail, solar granulation, and lighter colored faculae. The disk is set against a dark background, free of the haze and scatter that is common in typical 'mylar' films or inexpensive glass filters. The performance of Astro Solar Filter Film is even more remarkable when considering its very low cost.

What is even more important - with AstroSolar Film the Sun appears in its real color - neutral white (with only a slight bluish tinge). Other films and glass filters produce a blurry bluish or reddish/orange/yellow Solar image, thereby cutting part of the spectrum. Especially with an orange sun, it is very hard to see faculae regions which are visible predominantly in the blue portion of the spectrum.

Due to its neutral color balance, AstroSolar Film enables the use of various color (or interference) filters which allows the observer to concentrate on certain spectral passbands for investigations of different layers within the solar "atmosphere". It is also possible to further improve the stability and sharpness of the solar image through the use of the Baader Solar Continuum Filter (sold separately). Views of granulation and faculae are particularly enhanced through the use of this continuum filter, in combination with AstroSolar film.

Please note that you cannot see solar prominences with white light solar filters such as this - that requires the use of sophisticated and significantly more expensive narrowband solar filters or telescopes. Solar filters made with AstroSolar Film with a neutral density (ND) of 5.0 can be used for visual and photographic, imaging and video applications.

Reviews

4.8 (Based on 9 Reviews) 100% of reviewers recommended this product.
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    1. Guest

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      Review by Darren H.
      1504621938
      Sep 5, 2017

      5.0 Excellent quality, affordable accessory for Solar observing

      Pros:

      Cons:

      Comments:

      Recently got this filter to use on my telephoto camera lens to shoot the eclipse. During pre-tests, this filter unit worked perfectly, and the rubberized clamp feet hold the filter snugly to the optic housing without marring, yet the filter can be removed easily.

      Image quality is as expected for a Baader Astrosolar film filter - excellent!
      What I really like with these newer units is that they store easily, are low profile, and convenient virtually anytime to use in the field. A great accessory and a "must-have" for anyone wishing to do some great solar observing or photography.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

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      Review by David S.
      1504582772
      Sep 4, 2017

      5.0 Baader Solar Filter

      Pros:

      Cons:

      Comments:

      Well designed, solid construction, sharp images. Just have to make sure that there is no stray light entering dew shield for lens flaring.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

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      Review by Michael E.
      1503872823
      Aug 27, 2017

      5.0 Survived the ECLIPSE!

      Pros:

      Cons:

      Comments:

      Went on a AT65EDQ during C1 -> C2 and a bit after C3.
      Did what it was supposed to do!

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    4. Guest

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      Review by Robert G.
      1503461301
      Aug 22, 2017

      4.0 works as expected -- velcro adhesive not strong.

      Pros:

      Cons:

      Comments:

      Worked fine Easy to assemble, easy to mount and dismount. Adhesive on velcro patches for scope for safely straps was weak. Maybe deteriorated from age?

      In any case, it worked great on August 21st, 2017.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

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      Review by Richard G.
      1503438980
      Aug 22, 2017

      4.0 Good for the eclipse

      Pros:

      Cons:

      Comments:

      Used it for eclipse, and probably will use it later for general sun observation. Saw a few sunspots. I see its for spotting scopes and not a your primary scope. But I did use it for a primary scope. Its a thin sheet of mylar looking material, that has some slight folds in it, its not completely flat. So I say its good but completely great.

      Bottom Line: Would you recommend this item? Yes
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      This review was provided courtesy of AgenaAstro.com

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      Review by LEWIS G.
      1499689360
      Jul 10, 2017

      5.0 Solar Filters

      Pros:

      Cons:

      Comments:

      These fit my telescopes well, and have both friction fit and velcro safety straps to insure a tight connection.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

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      Review by Scott W.
      1499106516
      Jul 3, 2017

      5.0 Versatile design

      Pros:

      Cons:

      Comments:

      I purchase a 90mm filter for my Tamron 150-600mm lens. I was impressed in the simplicity, yet functional design.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

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      Review by Steven S.
      1494041802
      May 5, 2017

      5.0 Use on a Tele Vue

      Pros:

      Cons:

      Comments:

      Use on a Tele Vue Ranger. Sun is silver. Really enjoy using and is so easy to set up on the scope. Highly recommended.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

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      Review by Karl H.
      1491683180
      Apr 8, 2017

      5.0 Stare at the sun

      Pros:

      Cons:

      Comments:

      As a kid I was always told not to stare at the sun. Well, heck with that, now I can stare at the sun all I want! The filter fit my Meade Infinity 80 perfectly. It comes with clear instructions, and was very easy to assemble and mount. It almost doesn't quite fit in the original box once completely assembled, but it fits well enough that I use the box as a case when packing it in my telescope bag.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

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      Specifications

      Manufacturer Baader Planetarium