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Home  Filters  Solar Filters & Glasses  Altair Solar Contrast Booster Filter 8nm - 540nm Continuum 2 Inch

Altair Solar Contrast Booster Filter 8nm - 540nm Continuum 2 Inch


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Altair Solar Contrast Booster Filter 8nm - 540nm Continuum 2 Inch
£89.00
 Inc VAT & Warranty
Availability - In stock

F20SCB5408

  • Description
  • Delivery

Product Description

The Altair 2 inch Solar Continuum filter Enhances sunspots, granulation, and fine photosphere detail. For use with Baader Solar Filter or Herschel Wedge.

IMPORTANT SAFETY INFORMATION:
DO NOT USE THIS FILTER FOR DIRECT SOLAR OBSERVATION! Must be used together with a professional solar filter or Herschel Wedge with Max. 0.024% transmission placed BEFORE this filter. For reflecting telescopes, we recommend Baader solarfilm on the front of the telescope, then screw the filter into a filter holder, camera, or eyepiece. For refractors, the filter should be positioned just in front of the camera or eyepiece with a Hershel Wedge in place. Do not use this filter without a suitable solar pre-filter in place, because it will permanently damage your eyes or camera!

The Solar Contrast Booster works by filtering out UV, IR and visual wavelengths except for a narrow 8nm FHWM green band at 540nm. This greatly increases the contrast of solar features when viewed with the naked eye, colour or mono camera, revealing more detail around sunspots and granulation (fast-developing solar convection cells) in the solar photosphere. Highly recommended for use with either Altair Imaging-Ready Hershel Wedge or Baader Solar Film. NOTE: Do not insert the filter before your Hershel Prism or it will melt, it should be placed just in front of the camera, and it should be screwed directly into your camera 2" nosepiece by means of the M48x0.75mm thread, E.g. Hypercam 2" nosepiece or use an Altair Magnetic Filter holder with 2" filter slider.

Why is transmission centred on 540nm wavelength? 540nm is a very desirable wavelength for imaging and observing the sun. The Solar Contrast Booster filter improves performance of any telescope optics such as Refractors, Newtonian reflectors, Maksutovs, Dall Kirkhams, Cassegrains, and SCT's. It's especially recommended with Frauenhofer Achromatic refractors and short focal length ED Doublets, because their optimum performance peaks in this green wavelength by design. In fact, not only Achromats, but most ED triplet and APO refractors traditionally have peak performance at 540nm wavelength, where the human eye shows best sensitivity. 530-540nm is not only the traditional "design benchmark wavelength" for most telescope optics, and also that of most high end interferometry equipment used to configure and optimise telescope lenses. Most colour and mono CMOS cameras also have peak sensitivity and resolution in green! Colour CMOS cameras in particular have an RGGB pixel layout with two green pixels for every one blue and red pixel, for an obvious increase in resolution. The are therefore many benefits in isolating this wavelength to capture those fleeting moments of good seeing.

Altair Solar Contrast Booster filter specifications:
Standard 2" Filter Thread Aluminium Cell
Band CWL540nm 90% transmission FWHM 8nm
1.85mm thick optical glass ?/4, Parallelism (arcsec) 30"
Si02 "hard" overcoat with UVIR Block 300-1100nm and Anti-Reflection Coating

Delivery charge £5.95

Delivery Information

Our delivery charge is £5.95* fully insured. Orders received before 2PM normally ship that business day. We also ship direct from our suppliers all fully tracked and insured.

We use UPS, DPD, DHL, APC, DX Express, ParcelForce and Royal Mail, we do not use budget couriers, we only ship to UK mainland addresses and do not ship to forwarding agents or PO boxes.

Our Order Lookup system (see link at the top and bottom of each page) updates the order status - simply enter your order number and postcode..

*Some exceptions apply with AB, FK, HS, IV, KA, KW, PA, PH, ZE postcodes. We will quote delivery charges if applicable prior to shipping (this does not normally affect lower value items shipped by Royal Mail).

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