Detailed information about this product's features  Astrodon Generation 2 Filters
This Astrodon Generation 2 E-Series CRGB (Clear, 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 filters are designed for use in Finger Lakes ProLine filter wheels, such as the CFW4-5 and CFW5-7, and any similar filter wheels that are designed to accept 50mm square unmounted filters.
These CRGB filters work best with high-quality reflectors, such as Ritchey-Chrétiens, that are intrinsically well color-corrected. They should be parfocal for systems as fast as f/3.5. The clear (no near-IR blocking) filter in this set may produce bloated stars if your optical system has poor near-IR focus, as is the case with many camera lenses and refractors, which is why this non-near-IR blocked CRGB filter set is generally the best choice for reflector imaging, rather than with less well-corrected refractors or camera lenses.
On the other hand, the near-IR blocked LRGB filter set #TB2LE50S has reduced UV contribution in its luminance and blue filters. This reduces star bloat in optical systems that are not well color-corrected. This makes LRGB filter set #TB2LE50S best suited for imaging with refractors and camera lenses, which often are not particularly well-corrected in the violet end of the spectrum, while this unblocked CRGB set is best suited for reflectors.
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 CRGB 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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