IR 850nm Pass Filter – 1.25″


IR 850nm Pass Filter is suitable for IR sensitive cameras.

SKU: ZWO-850IR1.25 Category:

Product Description

ZWO 1.25″ IR 850nm Pass Filter suitable for IR sensitive cameras. You don’t need to debayer and get the full resolution of this sensor when use it with a Color camera such like ASI224MC or ASI185MC. Because the QE responce  of sensor beyond 850nm  is all the same. So you can use a color camera as mono camera with this filter, just don’t forget to keep the WB_R and WB_B to 50 (no White Balance applied).

To see the unseen: ASI224MC+850nm IR filter + 2.1mm lens.


Transmission properties

The transmission properties of the IR 850nm Pass Filter are optimized for CCD astrophotography.


  • 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.

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  • 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 uestion, answer or comment? Post here!

  1. :

    In your description of the IR 850nm Pass Filter you state “you can use a color camera as mono camera with this filter”. Does that mean that I could combine this filer with the with the LRGB filers and use it just like an other mono camera? It seems like this would give the user the best of both worlds. Also does your filter wheel allow the use of two filers at once?
    Thank you

    • Sam Wen


      this is because the QE responce of this color cam after 850nm is equal like mono camera
      that’s why we can use it as mono cam with this filter

  2. :

    Sam, will this work well with 174MM and C11 for lunar imaging? compared to Astronomik Proplanet 807nm

    • Sam Wen


      yes, but a little dark

  3. :

    Sam, I’m using my 185MC for autoguiding as well. Will this filter improve or decrease the camera’s star sensitivity? How about the UV IR cut filter?

    • Sam Wen


      This filter is IR pass, you should not use it for guiding
      no filter needed for guiding

  4. :

    Hi !
    Can I use this filter with my ASI120MMs ? It seems this model’s QE is pretty low at 850-1000nm
    Many thanks.

    • Sam Wen


      all model’s QE is not very high at 850-1000nm
      so you can use it but need longer exposure
      or you can use it at daytime

  5. :

    Hi Sam,
    So if with this filter the Asi224 acts like a mono camera, can we add another Red filter to “freeze” the atmospheric turbulence like doining with normal mono camera?

    • Sam Wen


      850nm filter is already Red filter

  6. :

    Does the filter has any transmission below 400nm? Is it possible to have the full transmission spectrum of the filter, from 350nm for instance till 1000nm?

    • Sean Wang


      It does not have such transmission curve, we don’t for sure that 400nm is blocked. if you have very specifical request, I think need to buy a badder or Astromik IR filter.

  7. :

    Hi Sam,

    You say “ZWO 1.25″ IR 850nm Pass Filter suitable for IR sensitive cameras. You don’t need to debayer and get the full resolution of this sensor when use it with a Color camera such like ASI224MC”. I have a asi224mc and like to know how this works”. I use FireCapture to capture. I assume I have to leave the option ‘debayer’ unmarked so I capture in raw-mode. For aligning and stacking I use Autostackert. You say that when using this IR-pass filter I don’t have to debayer. Does that mean I have to chose the option ‘grayscale’ under the color-menu?
    Is this the way to go?
    Hope to hear from you.

    • Sam Wen


      yes, you are correct
      you can treat the color sensor as mono one

  8. :

    Hi, I was wondering if this IR 850nm Pass Filter will fit for the ASI183MM (mono) camera. I am interested in monitoring IR lasers with that camera, but it seems like the IR 850nm pass filter is the only IR pass filter available for purchase.

    Thank You,

    • Sam Wen


      yes, you can use this filter with 183MM
      but I am not sure IR laser pass 850nm light or not

  9. :

    Hi, in the image below the product that captures veins of hand, which camera you have used with this filter?

    • Sam Wen


      we used ASI224MC

  10. :

    Is this filter recommended to use with the ASI290MC?

    • Sean Wang


      No, color camera is not suitable for infrared ray imaging. I recommand mono camera to do this.

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