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Baader Narrowband O-III (8.5nm) CCD-Filter - 1.25" # FOIIIN-1 2458435

5.0 (2 Reviews) Read Reviews Write Review
Brand Baader Planetarium
Part Number 2458435
Availability available

Product Info

Manufacturer Description

CCD imagers will find Baader's Premium Narrowband CCD passfilters to deliver the absolute highest contrast deep sky images in H-Alpha, H-Beta, Oxygen III, and Sulfur-II, with the shortest exposures possible. Their ultra-narrow bandwidths have extremely high transmissions, while completely rejecting light pollution as well as the important blocking of longer wavelengths.

The high optical quality of the Baader narrowband filters guarantees no loss in sharpness or contrast. Each substrate is fine-optically polished plane parallel to deliver a smooth and accurate 1/4 wavefront over the entire surface. This special custom polishing operation sets Baader filters apart from the standard commercially precision polished filter substrates used by most other filter manufacturers.

In addition to their transmission properties, the Baader coatings were developed with another key goal in mind - eliminate the annoying reflections present in other narrowband astro-filters. To achieve this freedom from reflections, along with excellent out of band blocking, required careful design and testing of the coating stacks.

Coatings are professionally applied in Germany by the most sophisticated equipment available today, ensuring high consistency for bandpass centering, transmission, and out of band blocking. The anti-reflection coatings are designed to prevent halos and balanced to prevent physical deformation of the optically flat substrates. The ultra-hard ionbeam deposition ensures the coatings will never degrade from use or normal cleaning. Each filter is coated individually, permanently sealing the coating edges, in order to guarantee lifetime coating durability and uniformity. Baader mil-spec coatings won't degrade, peel or flake off, unlike the coatings of filters that have been simply cut out of pre-coated sheets of glass. This cutting operation leaves the coating edges rough and torn which enables penetration of moisture between the coatings and substrate.

Agena Note: Please note that this filter does not feature a female thread. Hence, you cannot stack additional 1.25" filters on to this item.

Reviews

5.0 (Based on 2 Reviews) 100% of reviewers recommended this product.
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    1. Guest

      Skill Level
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      User Notes:
      Review by Scott I.
      1523538635
      Apr 12, 2018

      5.0 Recommended

      Pros:

      Cons:

      Comments:

      After purchasing a ZWO 1600mm-cool and the 8slot wheel, I was not satisfied with the ZWO filters that came with the kit. I was getting really and halo’s and other strange artifacts that I believe were caused by the stainless screws holding in those filters.

      The Baader filters that I replaced them with are wonderful. No halo’s, installation into my wheel was to screw the housing directly in place and done. No tweezers to mess with no extra shiny screws.

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

      This review was provided courtesy of AgenaAstro.com

    2. Guest

      Skill Level
      Unknown
      Time with Product
      Unknown
      User Notes:
      Review by telescope tom of Tucson.
      1444521600
      Oct 10, 2015

      5.0 Quality

      Pros:

      Lightweight,Compact,Quality Lenses,Accurate,Strong Construction,Easy to Use

      Cons:

      Comments:

      Read a report that O-3 filters worked on Venus for seeing cloud structures. Certainly helped dim the glare, easy to achieve precise focus, actually saw the 'ashen light', the whole dark side of the planet is lit up slightly from the background sky. Get the cheaper, not as narrow band to use in small scopes. This is best in 10" and larger.

      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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