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26 EUR
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price without VAT: 21 EUR
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![UV IR cut 1,25\" filter (ZWO)](images/150_zwo_ir-cut_1,25.jpg "UV IR cut 1,25\\" filter (ZWO)") Shop online:
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Shop in Warsaw (qty): 10+
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ZWO UV / IR Cut 1.25" is a professional astrophotographic filter blocking ultraviolet and infrared radiation, intended for use with color CCD and CMOS cameras equipped with an AR protective window.
The use of this filter allows for significant improvement in the contrast and sharpness of objects photographed with color cameras in the visible radiation range. Unlike the human eye, devices of this type are sensitive to infrared, the component of which causes a noticeable deterioration of image quality (More information on this subject can be found in the expert note at the bottom of the page).
Since the transmittance range of the ZWO UV / IR Cut 1.25" filter covers the Hα band (656.3 nm), it can also be used in solar photography to protect the much more expensive Hα filter against thermal damage.
Attention! Visual observations of the Sun should always be conducted through a dedicated solar filter or Herschel wedge). Before purchasing a UV/IR Cut filter, make sure that the camera is equipped with an AR protective window. • significant improvement in the contrast and sharpness of photos by eliminating the star bloating phenomenon
• suitable for photographing planets and deep sky objects
• possibility of using it as a protective filter for the Hα filter when photographing the Sun
• compatible with color cameras equipped with CMOS and CCD matrices • filter type: UV / IR cut filter
• Filter diameter: 1.25"
• filter thickness: 1.85 mm
• frame thickness: 5 mm
• thread length: 2.5 mm
• filter shape: round
• blocked bands: ultraviolet, infrared
• transmittance window: 400 - 750 nm
• maximum transmission: >90%
• maximum transmission range: ~420 ÷ ~680 nm
• compatible matrices: CCD, CMOS (color)
• frame finish: matte black • ZWO UV / IR Cut 1.25" filter
• plastic protective case 24 months
The offered ZWO UV / IR Cut filter has the marking ZWO 1.25" IR Cut Filter on the frame, as shown in the photos, but it filters both IR (infrared) and UV (ultraviolet). The difference is in the description (UV / IR Cut) and in the photo (IR Cut) is not a mistake. Additional photos present the spectrum in accordance with the actual transmission of the filter. The description and specifications are consistent with the manufacturer's description. Note added due to customer doubts regarding the filter type and product compliance with specifications. A filter blocking infrared and ultraviolet (IR/UV) is generally considered a mandatory element of the equipment of every astrophotography enthusiast working with a refractor, as well as with reflecting telescopes equipped with dedicated corrective lenses, e.g. coma reducers. Many posts on various astronomy forums suggest the need to use such a filter in the absence of a narrow or multi-band filter.
The use of this type of filter prevents the phenomenon known as "star bloating". It is caused by the high probability of chromatic aberrations occurring at wavelengths close to the lower and upper limits of the visible light range (near infrared and UV-A). The effect of such a filter is visible in the attached photograph taken using an apochromatic refractor (author: Carl Björk, ZWO ASI group, Facebook).
In addition to improving the quality of the obtained image, the IR/UV filter covers the camera sensor or matrix with the mirror in the case of digital SLR cameras. Thanks to this, these delicate elements are not exposed to dirt, making maintenance and cleaning of the camera or SLR camera easy and quick. Users of reflecting telescopes, where the light-receptor element is directly exposed to external factors, should pay special attention to this aspect of the use of the IR/UV filter.
Clear skies and happy observations!
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