Pegasus Astro LRGB Photographic Filter Set - 2" mounted

Pegasus Astro LRGB Photographic Filter Set - 2" mounted

These photographic deep space filters for broadband usage are helpful for creating RGB composite images with monochrome cameras.

The RGB filters are used for the three color separations in red, green and blue; to increase the detail contrast, a luminance image is also created.

Here, the L-filter is used to maintain the focus distance and additionally to block UV as well as IR light, which would bring blur into the image when using refractive optics, but, depending on the sensor, could also cause color shifts in objects that also emit light in the two spectral ranges.

Common features

Equal weight on RGB filters: RGB color combine weights are 1:1:1 - less work for achieving color-balanced images.

Parfocal LRGB Filters: Broadband filters are parfocal which ensures that you will not have to refocus when you quickly switch filters to capture images.

Anti-Reflection Coatings: Multi-layer anti-reflection coating ensure no halos, ghosting or reflections. Filters are resistant to scratches and do not get affected by temperature change.

Limited Sodium Light Pollution: A gap between green and red filters blocks out the primary sodium light pollution line at 589 nm and improves color balance and separation.

The Bandpass Filters

Luminance Filter (UV/IR Cut): The Luminance UV/IR Cut filter is designed for ultraviolet and infrared wavelength blocking to improve sharpness of the luminance image and reduce halos on refractive optical systems.

It can be used on CMOS and CCD cameras which do not have an IR protection filter toward an image sensor or were remodeled (DSLR, Mirrorless).

This type is required for CCD and CMOS sensors without filters, as they are extremely susceptible to UV and IR rays that are outside the visible spectrum and can severely degrade image quality.

Transmission range is from 410-680 nm with T_ave>95%.

In general, the filter can be used to maintain the focus distance when taking luminance images.

Red Filter: A high contrast red filter suitable for CMOS and CCD sensors. Filter is IR-blocking. Transmission range is from 600-680 nm with T_ave>95%. Note the gap between this range and the range of the green filter, reducing light pollution from the sodium lines at 598 nm.

Green Filter: A high contrast green filter suitable for CMOS and CCD sensors. Filter is IR-blocking. Transmission range is from 500-550 nm with T_ave>95%. Note the gap between this range and the range of the red filter, reducing light pollution from the sodium lines at 598 nm.

Blue Filter: A high contrast blue filter suitable for CMOS and CCD sensors. Filter is IR-blocking. Transmission range is from 410-500 nm with T_ave>95%.

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