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Baader Planetarium Semi-APO Telescope Filter

Item# AAS021
 
5.0

(10 Ratings)

Customer Q & A
1. Model Size:

Price:

$137.00

List Price: $137.00
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Details & Dimensions
Guarantee & Returns
  • Available in 1.25" or 2" format
  • Delivers amazingly neutral views
  • Cuts annoying violet fringe
  • Amazing on Jupiter or Mars
  • High-end Baader quality

Description

Baader's newest addition for Achromat owners. The Semi-APO works like its name implies - delivering an amazingly neutral view, while cutting most of the annoying and contrast-robbing violet fringe that plagues all achromats. The Semi-APO filter combines a stronger Fringe Killer coating formula with the Moon&Skyglow Neodymium substrate. The result is similar performance to the Fringe Killer + Moon&Skyglow combination, but with a slightly stronger violet cut - and at an even greater $$ value.
The Semi-APO filter benefits from all the host of world-class Baader filter attributes. The Semi-APO filter is truly the world's most advanced 'minus-violet' type filter in every regard. Its high efficiency and neutral coloration make it practically disappear in use - while making most of the violet fringe disappear! The effects on sharpness, contrast, and aesthetics are remarkable, even with small refractors. The RGB enhancement of the Neodymium substrate actually boosts color contrasts, particularly for Jupiter and Mars.

 


As a side benefit, the Semi-APO filter has also proven to be the best Mars filter we've used - with ALL Telescopes, including large Dobsonians, SCTs, and Apochromats. The unique properties that result from the combination of the Fringe Killer's blue wavelength attenuation (attenuation - not total elimination), plus the selective Neodymium RGB passbands, result in a significant contrast enhancement of Martian features. The image retains its natural coloration and brightness, and the optically polished surfaces maintain every bit of the image sharpness, unlike other manufacturers' filters.

 


The high quality of Baader Planetarium filters permits their use well ahead of the focal plane with no image degradation (ie, for cameras or binoviewers). The inclusion of Baader's renowned UV/IR Cut coatings on the Semi-APO eliminate UV and IR wavelengths to make it ideal for high-resolution imaging with Webcams, DSLR, and CCD cameras. The high transmission and fringe reduction work great for both planetary and deep sky imaging.


CHOKING HAZARD - small parts may pose a risk to children under 6 yrs.

Shipping Restrictions:
Only ships in contiguous USA.

Dimensions & Specifications

Size

2 Inches

Warranty

2 Year Manufacturers Warranty

Type

Color Correction Filters

Brand

Baader Planetarium

Telescope Accessories Series

Filters

Options

Model Size: 2 Inch Semi-APO Filter

Baader Planetarium Semi-APO Telescope Filter
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The Perfect Accessories

Customer Reviews

REVIEW SNAPSHOT®

by PowerReviews
Baader Planetarium Semi-APO Telescope Filter
 
4.8

(based on 10 reviews)

Ratings Distribution

  • 5 Stars

     

    (8)

  • 4 Stars

     

    (2)

  • 3 Stars

     

    (0)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (0)

100%

of respondents would recommend this to a friend.

Pros

  • Great optics (6)
  • Easy to use (4)
  • Strong construction (4)
  • Widely compatible adapter (3)

Cons

    Best Uses

    • Astronomy (7)
    • Astrophotography (4)
    • Bright conditions (4)
      • Reviewer Profile:
      • Avid adventurer (5), Casual/ recreational (4)
      • Was this a gift?:
      • No (4)

    Reviewed by 10 customers

    Sort by

    Displaying reviews 1-5

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    5.0

    Live close to town? Than one is for you!

    By Douglas

    from BOYNTON BEACH,FL

    About Me Avid Adventurer

    Verified Buyer

    Pros

    • Easy To Use
    • Great Optics
    • Strong Construction
    • Widely Compatible Adapter

    Cons

      Best Uses

      • Astronomy
      • Astrophotography
      • Bright Conditions

      Comments about Baader Planetarium Semi-APO Telescope Filter:

      Great filter,kills fringe,blackens space real well .live in town with light pollution,helps block that pretty well.transparency good.a must for refractor owners you will see a huge difference.

      • Was this a gift?:
      • No
       
      4.0

      Great filter but

      By refractor guy

      from Elgin IL

      About Me Casual/ Recreational

      Verified Reviewer

      Pros

      • Easy To Use
      • Great Optics
      • Strong Construction

      Cons

        Best Uses

        • Astronomy

        Comments about Baader Planetarium Semi-APO Telescope Filter:

        This is a nice filter and works great for removing the purple halo around bright objects. But it dims the image to much in my 4" refractor. I would say this would be a great filter for 5" and larger achromatic refractors. Another nice feature is the image is not yellow like some filters. If you have a 4" or smaller refractor go for the Fringe Killer instead.

        (2 of 2 customers found this review helpful)

         
        5.0

        Works as advertised

        By Dale

        from Archie,mo

        About Me Casual/ Recreational

        Verified Buyer

        Pros

        • Does What It Is Designed

        Cons

        • None

        Best Uses

        • Bright Conditions

        Comments about Baader Planetarium Semi-APO Telescope Filter:

        This filter eliminates most of the purple fringing in my meade ar-6. You can still see a small amount of purple around jupiter, but it is greatly reduced. It does a excellent job of letting light through with just slightly darker views when it is on. You can leave it on for all your viewing for the most part. I did remove it to view some of the faintest objects and did notice slightly brighter views without the filter.

        • Was this a gift?:
        • No

        (2 of 3 customers found this review helpful)

         
        5.0

        Baader Semi-APO Telescope Filter

        By Russell

        from Phoenix, AZ

        About Me Casual/ Recreational

        Verified Buyer

        Pros

        • Easy To Use
        • Good Padding
        • Great Optics
        • Strong Construction
        • Widely Compatible Adapter

        Cons

        • Not well advertised

        Best Uses

        • Astronomy
        • Terrestrial Viewing

        Comments about Baader Planetarium Semi-APO Telescope Filter:

        An excellent product. If you have a good achromatic refractor, this filter will make it.. 'semi-apo' !

        Why spend $thousands for an apo when you can enjoy your good achromat.. er, semi-apochromat !?? It is THAT GOOD !

        • Was this a gift?:
        • No

        (4 of 4 customers found this review helpful)

         
        4.0

        Less color . . . more clarity!

        By Doc Bob

        from Chester, MD

        About Me Avid Adventurer

        Verified Buyer

        Pros

        • Great Optics

        Cons

        • None

        Best Uses

        • Astronomy

        Comments about Baader Planetarium Semi-APO Telescope Filter:

        Dramatic reduction in chromatic aberration in my achro refractor. Yielded crisp well defined images, and increased contrast of the Moon and Jupiter with little or no discernible color tint. Only a very thin color (purple) halo on Lunar limbs.

        Service and delivery comments:

        The service was excellent; the delivery was prompt - just a couple of days as promised.

        • Was this a gift?:
        • No

        Displaying reviews 1-5

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