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Baader Planetarium Semi-APO Telescope Filter

Item# AAS021
 
5.0

(10 Ratings)

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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 1-10

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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

        (10 of 10 customers found this review helpful)

         
        5.0

        Does exactly what it advertises!

        By Ghostryderflyby

        from Idaho

        About Me Avid Adventurer

        Verified Reviewer

        Pros

          Cons

            Best Uses

            • Astronomy
            • Astrophotography

            Comments about Baader Planetarium Semi-APO Telescope Filter:

            I was thoroughly impressed with this filter. I've come to expect a degree of "padding" of the capabilities of items by the marketing crews over the course of my 40 years, and while I expected this filter would be a good performer, I did expect some of that padding. I have to say for once I was surprised to find a product that lives up to it's marketing claims though. This filter actually does an excellent job of killing fringe.

            I have a Celestron C6-RGT achromatic refractor and did see distinct (but moderate) violet fringe on bright objects, such as Jupiter, the moon or even bright stars such as Sirius. I attached the 2" Baader semi apo filter to my diagonal, and it cut the fringe almost completely. In fact it cut it to the point I cant see it at all unless I spend time specifically focusing on the edge of bright objects specifically looking for fringe, and then it is barely perceptible. It cuts it so well you forget you are using an achromat and "fringe" leaves your vocabulary!

            In addition to the filter working incredibly for killing violet fringe, it has zero color corruption. Jupiter with the filter on was clearly orange, brown and white, not tinged pink by the filter as I expected, and the moon displayed sharp white, gray and black contrast with no tinting at all. Image clarity is crystal clear as well and objects actually looked sharper with the filter on than without it. I now leave the filter attached to my diagonal all of the time and use it for all viewing. It works that well.

            This is one of the pricier fringe killer filters out there, and I wouldn't complain if they dropped the price. With as well as this filter works though, it's worth the money!

            (2 of 2 customers found this review helpful)

             
            5.0

            This thing really works...

            By Artdirector

            from Fort Myers, FL.

            About Me Avid Adventurer

            Verified Reviewer

            Pros

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

            Cons

              Best Uses

              • Astronomy
              • Astrophotography
              • Bright Conditions
              • Travel

              Comments about Baader Planetarium Semi-APO Telescope Filter:

              This is great filter and does just what it says it gonna do. I'll add on a moon and sky glow or a minus violet and its even better. Considering what an APO costs, having a few inexpensive filters that can make the viewing almost as good is well worth it. I wound highly recommend this filter to anyone with an Achromat or even a reflector.

              (2 of 2 customers found this review helpful)

               
              5.0

              Highly Recommended FILTER!

              By Art Director

              from Fort Myers, FL.

              About Me Avid Adventurer

              Verified Buyer

              Pros

              • Good Padding
              • Great Optics

              Cons

                Best Uses

                • Astronomy
                • Astrophotography
                • Bright Conditions
                • Low Visibility

                Comments about Baader Planetarium Semi-APO Telescope Filter:

                This is a great addition for anybody with a Refractor. What a difference it makes when using high power on bright subjects. I've mixed it with a moon filter and good results on a very bright venus and an almost full moon. I would highly recommend getting this filter and using it every chance you get.

                (3 of 3 customers found this review helpful)

                 
                5.0

                Very impressed!

                By Tim A.

                from Fort Collins, CO

                About Me Casual/ Recreational

                Verified Buyer

                Pros

                • Superb correction

                Cons

                  Best Uses

                  • Moon and Planets

                  Comments about Baader Planetarium Semi-APO Telescope Filter:

                  This filter reaaly pulls its weight!

                  I use it on my 6" Celestron achromatic refractor. With an objective that size, chromatic aberration can be an issue. Now, the CR150HD (and its heir, the C6) have very little CA already, despite that beefy objective.

                  But the Baader semi-APO filter removes all traces of CA (at least to my eye). And it introduces only the faintest trace of color. Really, if you didn't know there was a filter in place, you just wouldn't notice. Except, of course, you might notice that there's *no chromatic fringing*!

                  I keep this filter screwed into my diagonal full-time, except for those really faint DSOs where I need every photon. (And with a 6" refractor, galaxy hunting is on the menu!)

                  If you have an achromatic refractor, you won't be sorry about getting a Baader semi-APO filter for it.

                  (1 of 1 customers found this review helpful)

                   
                  5.0

                  A surprisingly versatile filter

                  By Daniela

                  from Undisclosed

                  Comments about Baader Planetarium Semi-APO Telescope Filter:

                  I bought this filter for use in a largish refractor of a major brand, whose optics delivers some of those violet halos that we all so hate. I borrowed a filter identical to this one and tried it out for a few nights and I liked it, so, I bought one too. Then, as it happens, let's blame the bad weather, the not-so-good portability of the bigger scope, and the fact that I travel a lot (and can not carry around all of my scopes)but in the end, I did not yet get a chance to use as intended. Instead I was very pleasantly surprised at its versatility. First of all I tested the filter with two smallish refractors: a 70mm aperture from a major brand, whose optics on bright objects suffers from the violet plague - not to give the wrong impression, its performance is well within the expectation for an achromat (must be that we have become too spoiled). I also tried the filter with another refractor of a european brand with optics a step better than the other one (but still an achromat) and aperture 60mm. Yes, no question, the filter cuts down lots of light. But it is surprisingly usable even at small aperture, and delivers good images. The other big surprise came when, just for fun, I tested the filter on a reflector in the light-polluted city sky. It does a good job as reducing light pollution, too. The filter is well worth its price. I have not had the opportunity to compare it with other similar filters of different brands (maybe the next reviewer?) but I am very happy with mine.

                  Displaying reviews 1-10

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