IR 850nm Pass Filter – 1.25″

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: ASI290MM+850nm IR filter + 2.1mm lens.

Thickness: 1.9-2mm

Transmission properties

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

Shipping

It will take around 60-90 days for shipment via ePacket/China Post Registered Air Mail/EMS, which can’t be guaranteed due to force majeure.

Fast Shipping(amount ≧ 199USD) for free
Fast Shipping(amount < 199USD) : $20.00 (We do not provide free shipping from now on.)

If you can’t get the air mail package after 2months, please let us know ASAP: info@zwoptical.com

Introduction

Fast Shipping: we will choose DHL, UPS, FedEx etc to deliver it. Usually you will get your package within 7-14 days.
Customers from Brazil and Chile should leave a message to provide your CPF or CNPJ as your custom needs it.
Customers from Russia need to provide the complete English name with three words as well as the English shipping address.

Tracking site

DGM: http://webtrack.dhlglobalmail.com/?locale=en-US

China air mail: http://www.17track.net/en

Tax

The price list on our website is USD without tax.
Please note that buyers are liable 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: support@zwoptical.com. 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.
We will provide you RMA number if your camera requires warranty repair. We refuse any return without RMA number!
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!

Sindre – January 24, 2020:

If I buy the ZWO ASI290MC (color) camera, Can I use this filter with it to only show the IR spectrum ? Would I need any adapters or will they work together ?

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- Katherine Tsai – February 6, 2020:
  
  It will allow the light over 850nm to pass.
  You will need a T2-1.25″ filter adapter.
  https://astronomy-imaging-camera.com/product/t2-1-25-filter-adapter
  
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NenoVento – November 14, 2019:

Hi Sam, I’m asking the parfocal question because I was hoping to complete my ZWO manual filter wheel, which already has a ZWO LRGB set, with the IR 850nm Pass Filter, in order to take IR-Pass and LRGB pictures without having to change focus.
Regards,

NV

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- Katherine Tsai – November 15, 2019:
  
  I will recommend you to refocuse after changing filter. IR pass does not parfocal with LRGB filter.
  
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NenoVento – November 13, 2019:

Hi, is the IR 850nm Pass Filter parfocal with the LRGB set?,
Thanks,
NV

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- Katherine Tsai – November 14, 2019:
  
  Almost parfocal. It depends.
  
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Sławomir Maślisz – January 14, 2019:

Thank you katherine. Last question. I promise. Which of below mentioned cameras is the most sensitive one and best suited for ir pass filter. 120 mm mono or 224 mc color?

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- Katherine Tsai – January 17, 2019:
  
  Mono camera is better.
  
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slawek m – January 12, 2019:

hello, any feedback how to connect 1,25 filter with 2,1 lens? I unscrew lens from the T2 To CS or C adapter but there is no way to connect lens directly with the filter. thanks

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- Katherine Tsai – January 16, 2019:
  
  Sorry about the wrong message.:(
  I reconfirm the connection method with my colleague, the 850nm filter should be dispached from the screw and the replace the protective glass with the 850nm filter,
  carefully cover the camera cover and then connect the 2.1mm lens.
  
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Sławomir Maślisz – January 8, 2019:

Katherine, i hope you ever tried to conect 2.1 lens with 1.25 filter. No matter how hard i could try there is no way to connect both as you described. Can you please provide with more guidence? Thank you

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- Katherine Tsai – January 14, 2019:
  
  Sorry about the wrong message.:(
  I reconfirm the connection method with my colleague, the 850nm filter should be dispached from the screw and the replace the protective glass with the 850nm filter,
  carefully cover the camera cover and then connect the 2.1mm lens.
  
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Sławomir M – January 5, 2019:

Hello, product description sais “To see the unseen: ASI224MC+850nm IR filter + 2.1mm lens.” but how to connect 850nm filter with camera and 2,1 mm lens? thanks

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- Katherine Tsai – January 8, 2019:
  
  Unscrew the 2.1mm lens from the T2 To CS or C adapter,and then connect the 850nm IR filter and the lens.
  
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Alberto – May 21, 2018:

How is this filter mounted ? Cmount? 31,8mm filter? 2″ filter?

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- Sean Wang – May 22, 2018:
  
  it’s 1.25″ filter, can screw into M28.5 threads.
  
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Aldo – May 3, 2018:

thank you Sean for your answer,
I read this in the “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”
the behavior of the ASI 120 MC is therefore different from the 224 and 185 ?
thank you in advance for your opinion,

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- Sean Wang – May 3, 2018:
  
  protective window of 120 is IR-cut window. That’s the reason.
  
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Aldo – May 1, 2018:

I am the owner of an ASI 120mc;
would this filter improve the camera perfomance for planetary imaging?
would this filter make the camera work as a monochromatic one for deep sky?
thank you

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- Sean Wang – May 2, 2018:
  
  Sorry, only monochromatic camera is suitable work with IR 850 filter.
  
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Martin – March 7, 2018:

Is this filter recommended to use with the ASI290MC?

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- Sean Wang – March 9, 2018:
  
  No, color camera is not suitable for infrared ray imaging. I recommand mono camera to do this.
  
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AmirReza – January 7, 2018:

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

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- Sam Wen – January 10, 2018:
  
  we used ASI224MC
  
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Sunny – December 28, 2017:

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,
~Sunny

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- Sam Wen – January 2, 2018:
  
  yes, you can use this filter with 183MM
  but I am not sure IR laser pass 850nm light or not
  
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Erik – October 8, 2017:

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.

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- Sam Wen – October 9, 2017:
  
  yes, you are correct
  you can treat the color sensor as mono one
  
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Thanassis – September 15, 2017:

Hello,
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?

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- Sean Wang – September 19, 2017:
  
  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.
  
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hdryx – February 13, 2017:

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?

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- Sam Wen – February 19, 2017:
  
  850nm filter is already Red filter
  
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Joe – December 20, 2016:

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

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- Sam Wen – December 27, 2016:
  
  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
  
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Prem K – June 6, 2016:

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?

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- Sam Wen – June 8, 2016:
  
  This filter is IR pass, you should not use it for guiding
  no filter needed for guiding
  
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@leesklaar – May 14, 2016:

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

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- Sam Wen – May 16, 2016:
  
  yes, but a little dark
  
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Steve – March 22, 2016:

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
Steve

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- Sam Wen – March 24, 2016:
  
  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
  
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