ZWO 20nm CH4 Methane filter


SKU: ZWO-CH4 Category:

Product Description


The ZWO Methane band (CH4) filter is a special filter for photographical use.

Its FWHM is 20nm which is suitable for most IR sensetive color or mono cameras.It can reveal the detail of the target and not too dark.

It is recommended  for planetary imaging such like Jupiter, Saturn and the other planets.

This filter is a 1.25″(31.7mm) filter and comes with an inner filter thread . It is protected in a plastic case.


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


  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 or replace for free if the camera doesn’t work within warranty period. After the warranty period, we will continue to provide repair support and service on a charged basis.
  • 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 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.


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

  1. :

    Could this be used on a ASI290MC camera? Without the IR-cut filter I assume.


    • Sean Wang


      Hi, It is not good for color cameras, in infrared channel, sensitivity of color camera is too low.


  2. :

    Hi Sam. Would this CH-4 really be important for imaging Jupiter and Saturn? Should it be used along with your D-21 UV/Cut window as well on my ASI224mc? Or is the D-21 sufficient? I’m using a TeleVue Powermate 2.5 then your ADC, in front of your ASI224. Is that how you would place them? Where would you put the CH-4 with the 1.25 threads? The Powermate 2.5X doesn’t have filter threads!


    • Sam Wen


      no, CH4 should work together with AR window
      IRCUT will block CH4 filter, 224 is ok as it come with AR window
      the thread of CH4 filter is M28.5X0.6


  3. :

    Took a chance, got one now.
    I measured filter threads to 2,5mm, filter height without threads 5,0mm.
    I see from the EFW/EFWmini product pages, requirements are “threads length shorter than 3mm, height without threads less than 7mm”. All right then.
    Still, would like to know the GLASS THICKNESS. (harder to measure safely)


    • Sam Wen


      suppose to be 2mm


  4. :

    What’s the thickness of the glass?
    And height, threads/total?
    That is, will it fit in EFW/EFWmini?



Add new