ZWO Duo-Band Filter

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Product Description

ZWO Duo-Band Filter is a dual narrowband filter primarily aimed at complementing our range of colour ASI cameras. The Duo-Band filter is aimed at the astronomer who may already own a One Shot Colour (OSC) camera and wants to image using narrowband techniques or emission objects without purchasing a mono camera, filter wheel and narrowband filter set.

The Duo-Band filter offers an economical entry into the world of narrowband imaging and can also offer a practical solution to imaging in light polluted urban areas.

The dual band pass nature of the Duo-Band filter passes light at Hα (656nm) and OIII (500nm) wavelength, and can reduce the interference from natural light sources such as moonlight, or artificial light pollution such as street lighting.

It can help improve the contrast and visibility of deep sky objects such as emission nebula using a OSC camera.

If you are looking for a solution to deep sky photography in light pollution area, then ZWO Duo-Band Filter will be a great choice.

The Duo-Band filter can be used with all ASI cameras and EFW Electronic Filter Wheel and comes in 1.25” and 2” sizes.

ZWO-Duo-Band-Filter

 

Technical Parameter

Name: ZWO Duo-Band Filter

Size: Standard 1.25” & 2”

Glass thickness: 1.85 mm

Bandwidth: HA (15nm) OIII (35nm)

Surface quality: 60/40 (Refer to MIL-O-13830)

Schott substrate material

More than 90% transmission at major OIII line 486.nm1, 496nm and 501nm.

More than 80% transmission at Ha line 656.3nm

ZWO-Duo-Band-filter (2)

 

Features

Aerometal material. Precise CNC machining;

Fine sandblasting process and anodized finish;

Extinction treatment to prevent reflection;

Laser engraving font that will never fade;

Precise double-sided optical coating;

Fine-optically polished to ensure accurate 1/4 wavefront and <30 seconds parallelism over the both surfaces;

ZWO-Duo-Band-filter-1.25''

ZWO-Duo-Band-filter-2''

 

Kindly Reminder

The incoming light transmitted through the filter should be perpendicular to the filter, or the incident angle should be less than 8°. Therefore, this product is not suitable for wide-angle or ultra wide-angle lenses.

incident-light-to-the-filter

 

Test Results

Images captured with ASI color cameras and Duo-Band Filters. You can see that the potential for deep space photography in strong light polluted areas is vastly improved with the Duo-Band filters.

修改(3)(1)Heart(with without)-Duo-Filter(1)

修改(1)(2)Horsehead-(with without)-Filter(1)

Thanks to Tim Connolly’s Sharing

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

  1. Fast Shipping: we will choose DHL, UPS, FedEx etc to deliver it. Usually you will get your package within one month.
  2. Customers from Brazil and Chile should leave a message to provide your CPF or CNPJ as your custom needs it.
  3. 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: info@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!

  1. Avatar

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    I am using the OAG with 120mini and 533Pro, without the filter wheel, I don’t know where and how should I attach this filter to?




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    Hi,
    I want to put your filter between a reducer (M48 male) and my camera (M48 female), is it possible ? It will add 1.85mm to the light path isn’t it ?
    Thanks.




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      Yes, it is possible. And it will not add 1.85mm to the light path.




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    “This Duo-Band Filter has a metal frame with threads, you could attach to your camera or telescope according to the threads.”

    Of course it has a threaded ring. But this does not answer the question. Which side of the filter (not the frame) should face the camera, or does it matter?




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      Sorry about this! No matter which side of the filter is facing the camera.




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    Does it matter which side is front or back?




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      This Duo-Band Filter has a metal frame with threads, you could attach to your camera or telescope according to the threads.




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    Does it matter which side of the filter faces the camera?

    In my imaging setup the side with the female threads would be facing the camera.




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      This Duo-Band Filter has a metal frame with threads, you could attach the camera according to the threads.




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    Hi, in the example pics, it shows without Duo filter, with duo filter. The without pics, I believe, are much lower in exposure time than the with Duo filter pics, the without Duo looks like it’s 11s exposure, the with Duo looks to be 132s exposure. If I’m correct, is it possible to see pics of the same exposure time so I might better see a comparison between the difference the Duo makes. If I’m mistaken please correct me. I understand that the Duo Filter will require longer exposure time than a non filter would.




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      We are sorry about these pictures, and we will test again in the future, then correct the pictures.




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    I have the ASI294MC Po and want to know if the 2″ filter will work with my Tak E160 (160mm f3.3) and my 8″ f4 Newtonian.
    Thanks,
    Dave




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      Yes.




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    Would it be possible to use with mono camera? Would there be any benefit?




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      It is a filer that can reduce light pollution. I recommend you use it with color cameras. But it can also be used with mono cameras. When you use mono cameras, you can use it as an “L” channel.




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    Do you have any example images to show? Would love to see how it performs with an ASI294 MC Pro. thanks




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      Yes the images are taken with ASI294MC Pro.




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    Hi ZWO Team,

    Is this filter suitable for an ASI294 with Hyperstar V4 (filter slider) on a C8 Edge HD ? I still wonder about the 8 degrees angle condition you mentioned…

    Thank You.




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      It may fail on fast ratio telescope…




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    Bonjour,
    Le filtre 2″ convient il avec une caméra ZWO asi 533mcpro, un tiroir à filtre zwo sur une lunette de diamètre 72mm et 420mm de focale ?




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      2″ filter is too big for ASI533, you can choose 1.25″ instead.
      Yes it can.




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    Thread size on 2 inch filter frame?




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      M48*0.75




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    Hi,

    Can i use this with a zwo 071 and and the ZWO OAG? (between the OAG and Camera) if so i need it in place of the 21mm extender.

    OAG = 16.5
    Zwo duo band = 5mm (??)
    16mm Spacer (??)
    071 Camera

    Regards
    Peter




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    How do I decide between the 2″ and the 1.25″ filter? I have an 8″ SCT, f/6.3 reducer, and Canon EOS Rebel T6 camera.




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      I recommend you 2″ filter.




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    I have a ES 80 APO with Nikon D5100 and ASI224MC. Two questions here:

    1. Which filter size should I buy? 1.25″ or 2″ ?
    2. Is it too wide to use your filter ? Because the description says the filter is NOT suitable for wide-angle astrophotography.

    Thanks




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      1.25″ filter for ASI224 and 2″ filter for Nikon D5100.Do not worry it can be used.




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    Would this work with the Celestron RASA 11? It’s at f/2.2 620mm focal length.




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      It may fail with fast ratio.




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  17. Avatar

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    Hello,
    You say it is not suitable for wide angle.
    My telescope is 360mm focal length, 60mm objective (F6.0).
    Is this too wide, or will this filter be suitable?
    Thank you




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      Yes it is suitable but you need to pay attention to your sensor size.




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  18. Avatar

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    “Duo band has 1.25 inch and 2 inch size, do you mean you want to know which size is suitable for your telescope?”

    Hello Katherine,
    thanks for your answer. My question was not about the size, I wanted to know if the filters are usable on such fast F-Ratios, like F1.9 in my case. Most narrowband filters fail under such conditions, as the passing wavelenghts shift because of the fast system. Will the filter pass the correct wavelenght even on F1.9 systems?
    Best regards and thanks a lot, Michael




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      Sorry It may fail.




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    Is it suitable for Hyperstar systems (684mm / F1.9, C14 EHD)?




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      Duo band has 1.25 inch and 2 inch size, do you mean you want to know which size is suitable for your telescope?




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    It is pass H-beta line?




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      Yes it is.




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