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Astronomik Deep-Sky RGB Filter Set - 1.25"


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Product Details

  • Astronomik's Deep-Sky RGB 1.25-inch filters are the consequence of a long, meticulous research and development process. As a result, Astronomik has created the most advanced RGB filter set for Deep-Sky imaging currently available.

    The transmission curves of these filters are made to present you with strong, brilliant colors with a distinct reinforcement of the most essential emission lines. Data derived from the Astronomik Deep-Sky RGB filters is easier to process into a magnificent work of art.

    While designing these Deep-Sky RGB filters, Astronomik paid close attention to the sensitivity curves of the most popular modern CCD cameras. From this they found a method for making one set of filters for many types of sensors, from KAF and KAI sensors to Sony-made chips. This means you can perform 1:1:1 ratio RGB exposures with all sensors, with only nominal adjustments needing to be made during processing to obtain an image with flawless color!

    Transmission curve features and coatings on these Deep-Sky RGB filters have been produced so that no reflections or halos will be noticeable. You'll still be able to distinguish even the haziest areas of galaxies or nebulae even with bright stars in your field of view.

    You'll need to purchase an L1, L2, or L3 Luminance filter as well. Which one is best for you depends on the scope you're using with these filters- more information can be found on the separate page for the L1, L2, and L3 Luminance filters.

    Similar to all Astronomik filters, these Deep-Sky RGB filters are constructed using a very sturdy, scratch-resistant coating, collected on the finest polished optical substrate, which is completely free from any striae or internal strains. And since all substrates are manufactured to precisely the same thickness, all Astronomik Deep-Sky RGB filters are parfocal.

    OPT Product Number: AK-DRGB-1


  • specifications

    Filter TypeLRGB
    Free ShippingYes

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    Manning B.
    United States United States

    What Does "Parfocal" Mean for Filters?

    I bought these filters to replace an existing set because they are described as "parfocal". For those who are used to the application of this term to eyepieces or other equipment where "parfocal" means I can swap one item for another and the focus position is unchanged, it is helpful to know that is NOT what "parfocal" means for filters. I think this term is probably used in the same way for all filter manufacturers. In particular, if you measure the focal position of a telescope for the R, G, and B filters relative to the Luminance filter, the filter "offsets" may NOT be 0, 0, and 0. According to the manufacturer, the offsets may be 0, 0,and 0 for a reflector, but they are definitely not for an SCT. I have not seen a discussion of this behavior and it may not be commonly known, especially if buyers do not independently check the focus offsets after purchase and installation. I believe it would be very helpful if the product information would explain what I have just described so that buyers could make a more informed purchase decision.