The abbreviation L-RGB stands for Luminance, Red, Green and Blue. These filters are specially designed for astrophotography use. For creating a colour image with a black-and-white camera, an exposure is made through each filter. These are then combined on the computer to form a coloured combined image. The inclusion of the L-filter increases the contrast.
Using a colour camera eliminates the need for such filter sets, but only a black-and-white camera can take full advantage of the chip's resolution and also allows the use of line filters.

Baader
Filters UV/IR L CMOS 1.25"
$ 77.00
ready for shipping in 1-2
weeks

Astronomik
Filters Luminanz L-2 2" UV-IR blocking filter
$ 152.00
ready for shipping in 24
h

Astronomik
Filters Luminanz L-2 UV-IR blocking filter, 1.25"
$ 81.00
ready for shipping in 24
h

Meade
Filters RGB Color Filter Set 1,25"
$ 140.00
ready for shipping in 24
h

IDAS
Filters Type 4 BGR+L 31mm
$ 1,180.00
ready for shipping in 24
h

IDAS
Filters Type 4 BGR+L 52mm
$ 1,180.00
ready for shipping in 24
h

Omegon
Pro 2'' LRGB filters
$ 319.00
ready for shipping in 24
h

Chroma
Filters LRGB Set 36mm
$ 1,040.00
ready for shipping in 24
h

Astronomik
Filters DeepSky RGB Set 50mm
$ 710.00
ready for shipping in 3-7
days

Baader
Filters RGB CMOS 2"
$ 455.00
ready for shipping in 1-2
weeks

Baader
Filters LRGB CMOS 36mm
$ 452.00
ready for shipping in 1-2
weeks

Astronomik
Filters DeepSky 2" RGB filter set
$ 710.00
ready for shipping in 3-7
days

Astronomik
Filters Luminanz L-1 2" UV-IR blocking filter
$ 163.00
ready for shipping in 24
h

Baader
Filters LRGB CMOS 1.25"
$ 351.00
ready for shipping in 1-2
weeks

Antlia
Filters LRGB-V Pro 2" Set
$ 760.00
ready for shipping in 1-2
weeks

Astronomik
Filters DeepSky RGB filter set, 36mm, unmounted
$ 468.00
ready for shipping in 24
h

Astronomik
Filters Luminanz L-2 EOS-Clip UV-IR blocking filter
$ 112.00
ready for shipping in 24
h

Optolong
Filters LRGB Filter-Set 2"
RRP:
$ 433.00
Our price:
$ 374.00
ready for shipping in 24
h

ZWO
Filters LRGB 2" Filter Set
RRP:
$ 570.00
Our price:
$ 461.00
ready for shipping in 3-5
weeks

Chroma
Filters U-Bessel 1,25"
RRP:
$ 630.00
Our price:
$ 433.00
ready for shipping in 24
h

Astronomik
Filters Luminance UV-IR cutting L-1 Sony Alpha Clip filter
$ 187.00
ready for shipping in 3-7
days

Omegon
Filters Pro 1.25'' LRGB filter set
$ 209.00
ready for shipping in 24
h

ZWO
Filters Filter-Set L-RGB for camera ASI 1600 MM Mono 1,25"
RRP:
$ 234.00
Our price:
$ 192.00
ready for shipping in 3-5
weeks

ZWO
Filters LRGB filter 36mm unmounted
RRP:
$ 339.00
Our price:
$ 278.00
ready for shipping in 3-5
weeks

Baader
Filters RGB-G CMOS 2"
$ 185.00
ready for shipping in 1-2
weeks

Astronomik
L-1 UV-IR Block Clip-Filters EOS R XL
$ 199.00
ready for shipping in 3-7
days

Antlia
Filters Triband RGB Ultra II 2"
$ 309.00
ready for shipping in 3-7
days

Astronomik
Filters Luminanz L-2 EOS-Clip XL UV-IR blocking filter
$ 163.00
ready for shipping in 24
h

Astronomik
Filters Luminanz L-3 2" UV-IR blocking filter
$ 163.00
ready for shipping in 24
h

Astronomik
Filters Luminanz L-3 T2 UV-IR blocking filter
$ 152.00
ready for shipping in 3-7
days

ZWO
Filters ASI AR Protect Window D21
RRP:
$ 35.90
Our price:
$ 29.90
ready for shipping in 24
h

Astronomik
Filters Luminanz L-1 T2 UV-IR blocking filter
$ 152.00
ready for shipping in 3-7
days

Astronomik
Filters Luminanz L-2 UV-IR blocking filter, 50mm
$ 140.00
ready for shipping in 24
h

Astronomik
Filters Deep-Sky RGB 50x50mm
$ 820.00
ready for shipping in 3-7
days

Astronomik
Filters Luminance L-1 EOS-Clip APS-C UV-IR cutting filter
$ 117.00
ready for shipping in 24
h

Omegon
Filters 1.25'', L- RGB CCD filter set
$ 199.00
ready for shipping in 24
h