Celestron RASA 8 Light Pollution Filter

$799.00

AUD Price shown includes GST
GST is removed at checkout for NZ

SKU: 93614
Conditionnew

Out of stock. For Availability Call 02 9518 7255 or email sales@bintel.com.au

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    • Enhance your 8” Rowe-Ackermann Schmidt Astrograph (RASA) by blocking light pollution, improving image contrast, and darkening the sky background.
    • This filter selectively blocks wavelengths of light from sources of light pollution, such as streetlights, not broad regions of the spectrum.
    • Does not block wavelengths associated with emission nebulae, keeping your nebula images bright and detailed.
    • Fits into the 8” RASA’s integrated filter mount, maintaining peak optical performance.
    • Optically flat surfaces free of defects, constructed of Schott glass with anti-reflection coatings.

     

    Normally available for pickup or shipping approx. 2-3 business days from your order

    Light pollution in the night sky can significantly degrade contrast in astronomical images. This is especially true when using very fast telescopes like the 8” RASA because the sky background saturates very quickly. The “noise” of the light pollution overwhelms the “signal” from the celestial object you are imaging, making it difficult to get the most detailed image.

    The RASA 8 Light Pollution Filter remedies this by blocking light pollution while transmitting light from deep-sky objects. The result is bright, detailed objects that pop off the black sky background with superior contrast.

    Fortunately, many sources of light pollution have relatively discreet emission spectra; they emit primarily at specific wavelengths of light. By strategically blocking these wavelengths, the filter greatly reduces the effects of light pollution without degrading overall image quality.

    How it Works

    The Light Pollution Imaging (LPI) Filter for the 8” RASA blocks light from some of the most common sources of light pollution between 400-700nm (i.e., the visible spectrum), including high- and low-pressure sodium-vapour streetlights, mercury-vapour streetlights, and natural airglow caused by oxygen in the atmosphere.

    Unlike some light pollution filters, the LPI filter blocks only specific areas of the spectrum instead of wide regions. This helps to maintain image brightness and colour balance. In addition, specific wavelengths associated with emission nebulae, such as H-α(656nm), H-β (486nm), OIII (496nm and 501nm), and SII (672nm), are highly transmitted, ensuring minimal loss of image brightness for those objects.

    The filter fits directly into the internal filter mount in the RASA 8’s front lens cell, where the optical window normally mounts. By removing the clear window and replacing it with the filter, optical performance for the entire system is maintained.

    Each filter comes with a plastic storage case to safely store the filter or the placeholder glass that came with your RASA when not in use. You will also receive a spectral transmission graph unique to your specific unit, verifying its performance.

     

    RASA 8 Light Pollution Filter Specifications

    Material Schott B270
    Glass thickness 1.9mm
    Filter diameter 46mm
    Clear aperture 43mm
    Coatings Dichroic, multi-layer anti-reflection
    Housing Aluminium, black anodized

    RASA 8 Light Pollution Filter Instruction Manual

     

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