Detailed information about this product's features  Astrodon Generation 2 Filters
This Astrodon Generation 2 E-Series LRGB (Luminance, Red, Green, Blue) 50mm square unmounted filter set is optimized for Kodak and similar full-frame E-series monochrome detectors, plus back-thinned detectors. The filters produce approximately 1:1:1 color combine weights with equal RGB and dark frame exposures for the correct G2V white-point and the correct “teal" OIII color for planetary nebula with these cameras.
The filters can also be used with interline detectors, although the spectral response will not be quite as accurate as it is with full-frame detectors. Most astro-imagers are unlikely to notice the spectral response difference without doing an extensive side-by-side comparison.
These Generation 2 filters should be parfocal for systems as fast as f/3.5, if your optical system is well color-corrected. This LRGB filter set has a reduced UV contribution in its luminance and blue filters. This reduces star bloat in systems that are not well color-corrected. This makes these LRGB filters best suited for imaging with refractors and camera lenses, which often are not particularly well-corrected in the violet end of the spectrum.
On the other hand, the clear (no near-IR blocking) filter in Astrodon CRGB (Clear, Red, Green, Blue) filter set #TB2CE50S may produce bloated stars if your optical system has poor near-IR focus, as is the case with many camera lenses. For this reason, the unblocked Astrodon CRGB filter set #TB2CE50S would be better for imaging with reflectors, which are intrinsically more accurately color-corrected, while this near-IR blocked LRGB filter set is the best choice for imaging with refractors and camera lenses that may not be as well corrected in the violet end of the spectrum.
A spectral “gap" between approximately 540nm and 640nm minimizes the effect of mercury and high and low pressure sodium city light pollution, as well as several airglow emission lines due to ionized nitrogen in our atmosphere. This gap can be seen in the response curves in the feature image below.
These Astrodon E-Series 50mm square unmounted LRGB filters drop into the filter receptacles of Finger Lakes ProLine CFW4-5 and CFW5-7 filter wheels, or into any color filter wheel that accepts standard 50mm square unmounted filters. Each is parfocal with Astrodon's high-performance narrowband (H-alpha, Oxygen III, etc.) and near-IR filters, as well as with each other. The filters come individually wrapped in a hard plastic snap-lid storage case.
For more detailed information on Astrodon filters, click on the “Astrodon Generation 2 Filters" icon above.
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