Which sizes does the ZWO LRGB set come in?

1.25 inch, 36 mm and 2 inch. I use the 1.25 inch and the 2 inch sets; the 2 inch is the one in my full-frame captures.

What did I capture with it?

The Andromeda Galaxy twice: 2 h 18 min on the ZWO FF110 with the full-frame ZWO ASI6200MM Pro, and 1 h 30 min on the Askar SQA60 Pro with the ZWO ASI2600MM Air.

Why did my raw Andromeda stack look purple?

Straight out of the gate the LRGB stack had a purplish hue over the shot. It was a gradient, and the free tool GraXpert removed it; the raw stack and my finished image sit side by side on this page.

Do the ZWO LRGB filters block infrared?

Yes: ZWO states that they cut the infrared from 700 to 1,100 nm.

Are the filters parfocal?

ZWO makes the 2 inch glass 1.85 mm thick and the 1.25 inch glass 1.9 mm, and calls the 1.25 inch set more parfocal.

ZWO LRGB or Altair LRGB?

In 2 inch the Altair ColourPRO set is £240 against £332 for ZWO's, and it comes with a test report per filter; ZWO also makes a 1.25 inch set at £149 and a 36 mm set.

What have I not tested on the ZWO LRGB?

I have not measured the transmission or the passbands of these filters myself, and I have not shot them side by side with another LRGB set on the same target.

ZWO LRGB review: the ZWO 1.25 and 2 inch LRGB filter sets

Where does it rank on our leaderboard

Nine of the 13 filters on my board, against price
Rank	Filter	Stars for Your Buck	Recorded UK price
1	Scorpio HSO 3nm	100 out of 100	£448
2	Laida HSO 5nm 1.25″	94 out of 100	£154
3	SVBONY SV220 Ha OIII 3nm	92 out of 100	£249
4	Altair LRGB	79 out of 100	£240
6	QuarkStar Chromosphere	76 out of 100	£1,149
9	Altair Solar Contrast Booster Filter	73 out of 100	£80
10	ZWO LRGB	70 out of 100	£332
12	Optolong L-Ultimate Dual-Bandpass 3nm	43 out of 100	£216
13	ZWO HSO 7nm Narrowband	32 out of 100	£734

Contents

01 Where does it rank on our leaderboard
02 Specifications and features
03 How good is it? Here's what I captured
04 Raw against finished
05 In my words
06 Watch it in my videos
07 Should you buy it?
08 Questions and more about this review

In 30 seconds

Stars for Your Buck 70/100

Reviewed 2 Sep 2026 Updated 25 Sep 2026

Rank: #10 of 13 filters
Verdict: Worth a look

Written by Damon Scotting 3 min read

Buy it if

You image galaxies in colour with a mono camera and want LRGB filters in the size of your ZWO wheel.
You want a low-cost start in LRGB: the 1.25 inch set is £149.
You shoot full frame and need 2 inch filters.

Skip it if

You image nebulae under light pollution: a narrowband set does more there.
You want a 2 inch set for less, with a test report for every filter.
You use a one-shot colour camera: LRGB filters are for mono cameras.

“Maybe not blown away, but it's done exactly the job that I wanted it to.”

Specifications and features

Against the LRGB filter sets I have reviewed

Compare with

ZWO LRGB reviewed #10 of 13	Altair LRGB #4 of 13
Recorded UK price	£332	£240
Stars for Your Buck	70/100	79/100
Type	LRGB broadband filter set	LRGB broadband filter set
Bandpass	Approximate half-height passbands: L 385 to 700 nm; R 585 to 700 nm; G 490 to 570 nm; B 385 to 495 nm	Approximate half-height passbands: L 410 to 710 nm; R 600 to 705 nm; G 480 to 600 nm; B 415 to 515 nm
Lines passed	Luminance, red, green and blue (broadband)	Luminance, red, green and blue (broadband)
Peak transmission	More than 92%	About 96.5 to 98.5%
Sizes	1.25 inch (M28.5 x 0.6), 36 mm and 2 inch (M48 x 0.75)	2 inch
Thickness	1.85 mm (2 inch), 1.9 mm (1.25 inch)	1.85 mm, parfocal
Coating	Multi-layer anti-reflection, infrared cut from 700 to 1,100 nm	Dichroic dielectric, anti-reflection, UV/IR block, black resin edge
In the box	L, R, G and B filters	L, R, G and B filters, each with a test report

How good is it? Here's what I captured

Two captures

Andromeda Galaxy, ZWO FF110, ZWO LRGB 2 inch

Integration: 2 h 18 min (46 x 180 s)
Field: 2.7 x 1.8 degrees
Telescope: ZWO FF110
Camera: ZWO ASI6200MM Pro
Mount: ZWO AM3N
Target: Andromeda Galaxy (M 31)
Type: Galaxy
Location: Bortle 6.8 (in my garden)

Andromeda Galaxy, Askar SQA60 Pro, ZWO LRGB

Integration: 1 h 30 min (30 x 180 s)
Field: 4.7 x 3.0 degrees
Telescope: Askar SQA60 Pro
Camera: ZWO ASI2600MM Air
Mount: ZWO AM3N
Target: Andromeda Galaxy (M 31), wide field
Type: Galaxy
Location: Bortle 6.8 (in my garden)

Raw against finished

In my words

The 2 targets, the raw combined stack against my finished image, each with its integration, the camera and the palette:

Andromeda Galaxy (M 31): 2 h 18 min (46 x 180 s) of light, ASI6200MM Pro, ZWO LRGB, 2 inch, the raw combined stack with one automatic stretch
Andromeda Galaxy (M 31), wide field: 1 h 30 min (30 x 180 s) of light, ASI2600MM Air, ZWO LRGB, the raw combined stack with one automatic stretch

“Broadband utilises your colour filters, red, green and blue, as well as a fine detail addition of a luminance filter.”

From one of my videos

“These combine to give you the same looking images to the colour camera, except by isolating the imaging channels and using a monochrome camera, you are picking up more detail and therefore producing more vibrant images.”

From one of my videos

Watch it in my videos

Is the ZWO FF110 Worth $1,499? (ZWO FF110 + ASI 6200MM + AM3N + ZWO LRGB) · published 2 September 2026 · 6:45 · Watch on YouTube · 14,693 views, 237 likes on 2 Oct 2026

Jump to

0:23 ZWO FF110 specs
0:53 Focuser, built-in rotator, weight and length
1:30 The rig: ASI6200MM Pro, AM3N mount, LRGB and 2.5 nm filters
2:19 Andromeda Galaxy (M 31), 2 hours LRGB
3:03 Heart Nebula (IC 1805) in SHO
3:54 North America Nebula (NGC 7000), the Cygnus Wall
4:28 Dumbbell Nebula (M 27)
5:18 Elephant's Trunk Nebula (IC 1396), 3 hours
6:04 Verdict after 35 hours with the FF110

Transcript of the video 343 words · 2 chapters · searchable

Press a time stamp to play from there.

1:30 The rig: ASI6200MM Pro, AM3N mount, LRGB and 2.5 nm filters

1:31 So in order to capture some images of our night sky, we do also need a camera and a mount. 1:35 So everything you are about to see has been shot with an ASI 6200 monochrome Pro, which is a full-frame mono camera mounted on top of an AM3N harmonic drive mount. 1:47 Now, another key element is that in today's video, I'm going to be imaging multiple different targets. 1:49 And in order to do so, I need to use different filter sets, and they include ZWO's LRGB filter set as well as Antlia's 2.5 nanometre narrowband filters. 2:00 Now, the cost of this combination is a long way north of the price of the tube itself, so this is certainly something to factor in. 2:05 The telescope really is the cheapest component in our setup today. 2:08 You can, of course, partner it with cheaper gear, but in today's video, I'm trying to demonstrate what its true capabilities are from a light polluted English garden. 2:17 So, without further ado, let's see how well it can cope. 2:19 All right, so first up is one of our nearest galaxies, Andromeda.

2:19 Andromeda Galaxy (M 31), 2 hours LRGB

2:22 You're going to have to excuse me using a huge camera like this that costs more than twice that of the telescope itself. 2:27 Because the telescope supports full-frame cameras, I thought it was smart to push it to its limits. 2:32 And because of that decision and a few angle adjustments, I've managed to fit the entirety of the Andromeda Galaxy within the same field of view. 2:38 I think this might be the first telescope I've reviewed so far this year that has an F ratio higher than five, which is notable here because this shot does not feel as bright as my other attempts, but it is certainly still picking up some very sharp details, particularly in these galactic bands. 2:53 This was a little over 2 hours worth of integration time with the ZWO 2 inch LRGB filter set. 2:57 I think it's done an adequate job, but to tell you the truth, at the moment, I am just whelmed.

Check out more videos on the ZWO LRGB

What YOU Can See With a £1,249 Telescope! (Askar SQA60 Pro Review)

1 Sep 2026

Should you buy it?

70/100 Stars for Your Buck

Pros

Sold in 1.25 inch, 36 mm and 2 inch; I use the 1.25 and 2 inch sets.
More than 92% transmission in the passbands, with the infrared from 700 to 1,100 nm cut.
A small spectral gap in the passbands, to reduce the effect of light pollution.
The 1.25 inch set is £149 at First Light Optics.
On the ZWO FF110 with the full-frame ASI6200MM Pro, the 2 inch set gave me the whole Andromeda Galaxy in 2 h 18 min.

Cons

“LRGB filters won't particularly help you battle against light pollution, but narrowband is the perfect tool.”
“It definitely feels like a slightly longer and more arduous process having to image in luminance, red, green and blue as opposed to just colour.”
The 2 inch set is £332 at First Light Optics, £92 more than Altair's 2 inch ColourPRO LRGB set.
ZWO lists no individual test report with the filters.

I'm satisfied with this image.

Who the ZWO LRGB is for

Beginner to mono LRGB on a budget

Buy

The 1.25 inch set is £149 and fits a 1.25 inch wheel.

ZWO wheel owner

Buy

ZWO makes the set in 1.25 inch, 36 mm and 2 inch, the sizes its own filter wheels take.

Full-frame mono imager

Buy

The 2 inch set is the one I ran on the full-frame ZWO ASI6200MM Pro for the whole Andromeda Galaxy.

Buyer comparing 2 inch sets on price

Skip

My recommendation is the Altair ColourPRO 2 inch LRGB set: £240 against £332, with a test report for each filter.

Nebula imager under light pollution

Skip

My recommendation is a narrowband set such as the Scorpio 3 nm HSO.

One-shot colour camera owner

Skip

A colour camera already has its colour filters on the sensor; an LRGB set is for mono cameras only.

Three alternatives I have reviewed

Questions and more about this review

Reviewed by

Damon Scotting

The Telescope Man Verified

BSc (Hons) Physics with Astrophysics and Cosmology, Loughborough University PGCE / QTS, University of Nottingham

About Damon About Damon Damon Scotting is The Telescope Man. He holds a BSc (Hons) in Physics with Astrophysics and Cosmology from Loughborough University and a PGCE with QTS from the University of Nottingham, and taught physics in secondary schools before becoming an astronomy creator. He is a contributing writer for BBC Sky at Night Magazine and the author of 42 Wonders of Our Night Sky, and his photograph of the galaxy M100 with the dwarf planet Ceres was Highly Commended in the Astronomy Photographer of the Year 2024 competition run by Royal Observatory Greenwich. He has appeared on the BBC's Blue Peter. More than 750,000 people follow his astronomy channels on YouTube, Instagram and TikTok, and he has reviewed more than 140 telescopes, mounts, cameras, filters and accessories hands-on for this site. More about Damon · How I test · Damon's book

I review all kinds of gear: most of it I buy, some is gifted and some is loaned, and all of it is reviewed the same way. How this site is funded

Seven questions, answered

Questions about the ZWO LRGB

Reviewed 2 September 2026 ·Updated 25 September 2026

I review all kinds of gear. Most of it I buy, some is gifted and some is loaned, and all of it is reviewed the same way: no company sees or approves a review before it is published. Shop links marked Ad are affiliate links: I earn a commission when you buy through them, at no extra cost to you. How this site is funded

Which sizes does the ZWO LRGB set come in? 1.25 inch, 36 mm and 2 inch. I use the 1.25 inch and the 2 inch sets; the 2 inch is the one in my full-frame captures. The specifications and the comparison table ↓
What did I capture with it? The Andromeda Galaxy twice: 2 h 18 min on the ZWO FF110 with the full-frame ZWO ASI6200MM Pro, and 1 h 30 min on the Askar SQA60 Pro with the ZWO ASI2600MM Air. What I captured ↓
Why did my raw Andromeda stack look purple? Straight out of the gate the LRGB stack had a purplish hue over the shot. It was a gradient, and the free tool GraXpert removed it; the raw stack and my finished image sit side by side on this page. The raw stacks against the finished images ↓
Do the ZWO LRGB filters block infrared? Yes: ZWO states that they cut the infrared from 700 to 1,100 nm. The specifications and the comparison table ↓
Are the filters parfocal? ZWO makes the 2 inch glass 1.85 mm thick and the 1.25 inch glass 1.9 mm, and calls the 1.25 inch set more parfocal. The specifications and the comparison table ↓
ZWO LRGB or Altair LRGB? In 2 inch the Altair ColourPRO set is £240 against £332 for ZWO's, and it comes with a test report per filter; ZWO also makes a 1.25 inch set at £149 and a 36 mm set. The specifications and the comparison table ↓
What have I not tested on the ZWO LRGB? I have not measured the transmission or the passbands of these filters myself, and I have not shot them side by side with another LRGB set on the same target.