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Alternative Views:

Superb Refractor Filter
List Price: $136.00
Our Price: $92.99
Savings: $43.01
Glasses Compatible? n/a
Eye Relief: n/a
Diameter: 1.25"
Apparent Field n/a
Product Weight: 7g

Quantity in Stock:5

Availability:: Usually Ships in 24 Hours
Product Code: 1501000

Description Technical Specs Extended Information
Baader Contrast Booster Filter 1.25"
A unique filter for many different astronomical tasks – incomparable in acuity. A strong minus-violet filter for achromats, and an EXCELLENT PLANETARY FILTER.
  • Eliminates the color error of economy
  • Refractors

  • Clearly puts the real quality of the lens on display

  • Removes the bluish „hue“ (= lack of
  • contrast) during lunar-, planetary-,
  • solar- and terrestrial observation!

  • Strongly emphasizes surface detail on
  • Jupiter and Mars! If you have never seen
  • the GRS (Great Red Spot) on Jupiter –
  • with this filter you will!

  • Over 95% transmission – provides a
  • bright, brilliant image compared to the
  • usual dark green color filters, used to
  • bring out detail on Jupiter.
  • Color recognition will be retained!

  • The ultimate in lunar filters! Moon
  • (and Sun!) appear much more natural in
  • color (with a slight yellowish tint),
  • compared to the usual low priced dark
  • green Moon-filters, usually offered for
  • beginners telescopes.

  • Completely removes distracting false
  • color and the resulting smeared
  • and washed out image details. You have
  • never ever seen the Moon or the Sun
  • (with AstroSolar Safety Film) so tack
  • sharp in an economy priced telescope!

  • Blocks atmospheric „stray light“ (skyglow).
  • Sky-background turns into pitch black!

  • Fits each and every standard filter thread;

  • Combines with the (planeoptically
  • polished) BAADER Infrared Cut-Filter.
  • In this combination all blue scatter as well
  • as unfocused near infrared light is
  • completely removed – an absolute MUST
  • for digital imaging!

  • Planeoptically polished, suitable for
  • being used in front of a binocular viewer,
  • or for afocal image projection during digital imaging (way in front
  • of the focal plane!)

  • No deterioration of resolution with
  • magnifications of 200 x and more – as with „raw polished“
  • (flame polished) glass!

  • Substrate (glass melt)
  • Neodymium doped glass

  • Coating /rear face: 7-layer
  • hard-multicoating,
  • featuring 0,25% reflection

  • Coating/front face: 23-layer
  • dielectric long pass blocker

  • Ionbeam hardened coatings
  • on both faces, absolutely
  • scratch resistant – may be cleaned
  • any time without fear

  • A significant part of City Light
  • Air Pollution, as well as Atmospheric
  • Airglow is removed from the
  • telescopic image.

Average Rating: Average Rating: 5 of 5 5 of 5 Total Reviews: 14 Write a review »

  0 of 0 people found the following review helpful:
5 of 5 Nice experience September 15, 2023
Reviewer: Tom Crawford from Santa Barbara, CA United States  
Mr. Pensack is so knowledgeable about eyepieces, filters, etc. it was a nice experience to ask him questions about filters I had in mind to purchase. After deliberating, I finally settled on a filter. I highly recommend asking about the things you are thinking about getting. He is really helpful and super knowledgeable!

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  0 of 0 people found the following review helpful:
5 of 5 Excellent filters August 9, 2023
Reviewer: Dhananjay Nayakankuppam from Iowa City, IA United States  
These are very well made filters. They are mechanically very well constructed. You get a small bump in contrast without the objectionable color casts that you get with colored filters. I've used this in the past on planets and it made a small but noticeable difference on Jupiter and Mars. This pair I used in a binocular telescope and have only had a chance to view the moon. Did a nice job in enhancing the contrast and bringing out things like ejecta, rilles and pyroclastic deposits.

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  0 of 0 people found the following review helpful:
5 of 5 Nice detail on Jupiter February 28, 2023
Reviewer: David Glasser from Ellicott City, MD United States  
Tried this out on the planets and it definitely helped bring out some of the low-contrast details. Clear night, above average seeing, 4" f/5.4 refractor @ 180x.

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  0 of 0 people found the following review helpful:
5 of 5 I love it! November 7, 2022
Reviewer: Joseph Adams from Columbus, OH United States  
I gasped "Wow!" when seeing Jupiter with this filter! I'm using it all the time for planetary viewing. I haven't tried Mars yet, but it only slightly enhances viewing of the Moon and Saturn. Still, it's better than nothing. With Jupiter, though, it makes an incredible difference; it brings out so many more of the cloud bands and so much more detail within those bands.

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  0 of 0 people found the following review helpful:
5 of 5 Baader Contrast Booster September 19, 2022
Reviewer: MARK from United States  
I have used this filter with my 8" f/6.1 reflector and an assortment of Brandon and orthoscopic eyepieces for observation of Jupiter, Saturn, and Mars. The cloud belts on Jupiter are more defined than an unfiltered view and additional cloud belt detail is revealed. It helps somewhat with the definition of Saturn's ring system. Mars is where this filter really helps the most! An unfiltered view of Mars is often too bright and washes out detail. Most nights where I live the seeing will not permit anything north of 250x. With the addition of the Baader Contrast filter surface markings and the polar cap are readily apparent at lower mags.

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