ZWO LRGB 31mm Filters


SKU: ZWO-LRGB31 Category:

Product Description

The ZWO LRGB  31mm filter has better transmission, better coating,  better color separation

the RGB color combine weights will be approximately 1:1:1

  • Fine-optically polished to ensure accurate 1/4 wavefront
  • more than 92% transmission at passband
  • Infrared wavelength 700-1100nm cut-off
  • Precision off-band blocking
  • Multi-layers anti-reflection coating
  • Small spectral “gap” to minimize effect of light pollution
  • More parfocal – thickness 2 mm

Technical Parameter:

Name: ZWO 31mm LRGB filter (4 filters)

Size: D=31mm

Thickness: 2mm

here are the detailed photos





How to judge the positive and negative?

It is a little bit hard to judge the LRGB filters. Please watch the picture below carefully.

LRGB judge

Transmission Curve




  • Fast Shipping(amount ≧ 299USD) for free
  • Fast Shipping(amount < 299USD) : $20.00
  • Free Shipping(amount < 299USD) (Air Mail, 3-4 weeks) (Free)

If you can’t get the air mail package after 4 weeks, please let us know ASAP:


  1. Fast Shipping: we will choose DHL, UPS, TNT, EMS etc to deliver it. Usually you will get your package in one week. We provide free fast shipping for order ≧ $299 or charge extra $20 for order < $299.
  2. Free Shipping: we will ship via DGM or China Post Registered Air Mail. It usually costs 2-3 weeks to reach US or Europe and costs 3-4 weeks to reach far places.
  3. Customers from Brazil and Chile should leave a message to provide your CPF or CNPJ as your custom needs it.
  4. Customers from Russia need to provide the name of your company.

Tracking site:


China air mail:


  • The price list on our website is USD without tax.
  • Please note that buyers areliable to pay tax involved, such as Import tax, VAT , customs handling fee, etc. The additional fees may be collected at time of delivery by courier.
  • For best local service we advise customers buy our cameras form local dealers.

Warranty and Return Policy

  • We provide 2-year warranty for our products, we will offer the repair service for free within warranty period. After the warranty period, we will continue to provide repair support and service on a charged basis. We do not provide any replacement unless ZWO confirmed the product is DOA (Dead On Arrival).
  • This warranty does not apply to damage that occurred as a result of abuse or misuse, or caused by a fall or any other transportation failures after purchase.
  • Customer must pay for shipping when shipping the camera back for repair or replacement. If we confirm you can get a replacement, goods must be returned with all accessories, instructions, etc and must be suitably packed.
  • If you get a faulty camera, please contact us as soon as possible though email: Please describe the problem in detail and we will do our best to help you solve the problem. Most instances perceived problems are simply bad driver install or software configuration.
  • For customers who bought the camera from our dealer, dealer is responsible for the customer service for you.


Before first usage of this product read manuals and install correct drivers and software.

Do you have question, answer or comment? Post here!

  1. Avatar


    Hi, I found it a bit confusing. There are 1.25″ New LRGB filters optimized for ASI1600 but I can’t find a reference if these 31mm or the 36mm are also this new design. Can someone tell me if these 31mm LRGB filters are equivalent with the ‘New 1.25″ LRGB filter set’?


    • Avatar


      31mm and 1.25″ are differernt in size, the 31mm LRGB filters are new filters.


  2. Avatar


    Are these filters parafocal when used with a 1600 mm pro mono and the 8 slot efw ?


    • Avatar


      Yes, They are perfectly match!


  3. Avatar


    White Balancing RGB Filters ?
    I have a ASI 1600 MM-C and the ZWO LRGB filters (31 mm). I have read that exposure time for each filter is not the same.
    Can you tell me the wich is the ratio in exposure time between each filter ?

    Thank you.


    • Sam Wen


      usually 2:1:1:1 can provide better SNR of the image



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