Alstar Deluxe Telescope LRGB 1.25 in Filter Set - For Monochrome CCD

In this review of the Alstar Deluxe Telescope LRGB 1.25 in Filter Set the bottom line is simple: astrophotographers using a monochrome CCD who want to build high-resolution color images will find this set a practical and affordable way to capture separate luminance and color channels. The reviewer found the four parfocal filters-luminance plus red, green and blue-deliver consistent transmission and easy mechanical handling thanks to precision CNC-machined metal cells, making them a sensible choice for anyone combining long exposures with a filter wheel.

Key Features

• 1.25 in Luminance: Transmits the full visible spectrum and preserves fine detail for high-resolution monochrome luminance frames.
• RGB Color Filters: Separate red, green and blue filters capture the primary color channels needed to assemble accurate color images from a monochrome CCD.
• Dichroic Glass: Designed for maximum transmission so each color channel records strong signal without excessive loss.
• Parfocal Design: Filters are parfocal to reduce refocusing between exposures and save time during long imaging sessions.
• CNC-machined Metal Cell: Sand-blasted, black anodized finish with laser engraving and aluminum oxide threads for smooth, secure accessory coupling.
• Blocking Coating: Color filters include blocking coatings to suppress unwanted wavelengths and improve color fidelity in combined images.

Who It's For

This filter set is aimed at amateur and semi-pro astrophotographers who already use or plan to use a monochrome CCD camera and a filter wheel to create high-resolution color images. It is especially useful for those who prioritize control over exposure for each color channel and want parfocal filters to speed workflow.

It is less suited to users who rely exclusively on one-shot color cameras or who need larger format filters; the set is specific to 1.25 in accessories and is intended to be used with a filter wheel for the best experience.

Pros & Cons

Pros

• Consistent high transmission from dichroic glass produces strong signal for each channel.
• Parfocal filters eliminate frequent refocusing, making multisession imaging more efficient.
• Robust CNC-machined cells with aluminum oxide threads provide reliable mechanical coupling to accessories.
• Includes a full luminance plus RGB suite, so no separate color filter purchases are required to start LRGB imaging.

Cons

• Only available in 1.25 in size, so users with differing eyepiece/filter standards must confirm compatibility.
• Not a full specification for exact wavelength cutoffs is provided, so users needing precise bandpasses should verify fit for their workflow.

Specifications

Filter Set	LRGB (L, R, G, B)
Filter Diameter	1.25 in
Cell Construction	CNC-machined metal, sand-blasted, black anodized
Glass Type	Dichroic glass with blocking coating
Mechanical Thread	Aluminum oxide threads, compatible with 1.25 in accessories
Parfocal	Yes

Our Verdict

The Alstar Deluxe LRGB 1.25 in Filter Set is a practical, well-built option for monochrome CCD users who want to assemble true color images from separate luminance and RGB exposures. Its parfocal design and durable metal cells make it good value for astrophotographers using a filter wheel, though buyers should confirm 1.25 in compatibility with their system.

Frequently Asked Questions

Are these filters parfocal?
Yes, the filters are parfocal to reduce the need for refocusing between exposures.

Will these work with a filter wheel?
Yes, the set is designed for use with a 1.25 in filter wheel and changes smoothly between exposures when mounted in a wheel.

Do the filters block unwanted wavelengths?
The color filters include blocking coatings and use dichroic glass to improve transmission and reduce unwanted light.