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 (656.3nm) and OIII (500.7nm) 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.
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 495.9nm and 500.7nm.
More than 80% transmission at Ha line 656.3nm
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;
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.
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.
Thanks to Tim Connolly’s Sharing
Shipping & Delivery
Fast Shipping: we will choose DHL, UPS, FedEx etc to deliver it. Usually you will get your package within 15-20 days.
- Fast Shipping(amount ≧ 199USD) for free
- Fast Shipping(amount < 199USD) : $30.00 (We do not provide free shipping from now on.)
Introduction
- 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. If you can’t get the air mail package after 2months, please let us know ASAP: info@zwoptical.com
- 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 from local dealers.
Warranty & Return
1. ZWO hereby declares that it will provide customers with a warranty period of 2 years for ZWO branded products (excluding APO), as per this policy. APO products will be covered by a 1-year free warranty service, starting from the day following the receipt of the product by the customer. For ASIAIR Plus users, the warranty period will commence from the day of device activation.
2. If a User encounters the following Dead on Arrival (DOA) and contacts ZWO within the corresponding time limit to issue the Product purchase invoice and relevant evidence, ZWO will provide door-to-door pick-up service and, as appropriate, after-sale replacement (or partial replacement), repair or return (or partial return) service for the following Products:
1) Product quality problem
Provided that a User detects a quality problem and contacts ZWO within 30 days after receipt of the Products, and ZWO support team confirms that the Products indeed have a quality problem or defect after their inspection, ZWO will provide free replacement service towards such Products;
2) Product transportation problem
Provided that a User finds obvious signs of bubbling, serious overstocking, or deformation on the outer package of the Products upon receipt of the Products, and provides ZWO with pictures of the outer package and proof of receipt within 3 days after receipt of such Products, ZWO support team will verify the actual shipper and determine the responsible party for such transportation problem. In the event that ZWO is the actual shipper, ZWO will be responsible for providing the relevant return or replacement service, however, if the Products are directly sold or transported to the User by an agent of ZWO, the agent will be responsible for providing the relevant return or replacement service.
3. If the Products are under the following circumstances, they are not within the scope of warranty service, ZWO may provide maintenance services to the Users:
1) The Warranty Period of the Products has expired; or
2) The Products are injected into liquid or affected by moisture or corrosion; or
3) The Products are damaged by an external force (such as the broken of the camera protection window glass, the deformation of the product shell, the broken of the USB port, etc.); or
4) Disassembling, repairing by a third party, refurbishment of the Products (such as downloading erroneous firmware) without the written authorization of ZWO; or
5) The product system is modified, or the maintenance notice is lost or changed; or
6) Product quality problem caused by installation not following the requirements or instructions for the Products; or
7) Physical damage or failure of the Products caused by the force majeure (such as strong vibration or extrusion such as flood, fire, earthquake, or thunder stroke); or
8)Damage caused by the improper User operation during the period of shooting or use, such as using without the equipment protection or direct shooting of the sun; or
9) No valid purchase invoice or warranty certificate; or
10) The Products are second-hand products.
Any quality problem with the accessories or other parts of the Products is not a condition for the return or change of the Products, and the User may solely request to replace the accessories with new ones, which shall be handled after verification by ZWO support team.
If the issue with your ZWO product was caused by certain damage (such as severe damage not covered by the 2-year warranty), you might have to pay the replacement value.
4. For the normal repair or replacement of the Products during the Warranty Period, the User will bear the return cost. When returning the Products, Users shall specify the actual reasons for the damage to the Products, and shall provide the corresponding valid certificates, such as pictures or videos, etc.
For the Products that need to be replaced after being confirmed by ZWO in writing, the User shall return the Products with the complete package, together with all accessories, manuals, etc., to the address designated by ZWO.
By sending back the product to ZWO, the User agrees to pay out-of-warranty fees that may arise during the repair process of the product. ZWO will send back the product after charging.
5. If a User encounters any problem during the use of ZWO Products, you may at any time contact ZWO for technical support via ZWO Support.
For the Products that need to be returned for after-sales service, ZWO will provide the corresponding RMA code for reference.
ZWO will not accept any products having no RMA code that have been returned privately without ZWO written confirmation.
6. If a User purchases the ZWO Products from a ZWO agent, the User may contact the ZWO agent directly for the relevant after-sales service.
khoweilip – :
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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Moson – :
You could attach this filter with T2-1.25″ adapter which comes with the camera. There is the link for your reference:https://astronomy-imaging-camera.com/product/t2-1-25-filter-adapter.
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Frederic – :
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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Moson – :
Yes, it is possible. And it will not add 1.85mm to the light path.
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UlteriorModem – :
“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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Moson – :
Sorry about this! No matter which side of the filter is facing the camera.
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Yuhao Han – :
Does it matter which side is front or back?
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Moson – :
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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UlteriorModem – :
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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Moson – :
This Duo-Band Filter has a metal frame with threads, you could attach the camera according to the threads.
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Mike C – :
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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Moson – :
We are sorry about these pictures, and we will test again in the future, then correct the pictures.
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Dave Bloomsness – :
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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Katherine Tsai – :
Yes.
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Stephen R. – :
Would it be possible to use with mono camera? Would there be any benefit?
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Katherine Tsai – :
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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James Dixon – :
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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Katherine Tsai – :
Yes the images are taken with ASI294MC Pro.
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Emmanuel – :
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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Katherine Tsai – :
It may fail on fast ratio telescope…
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Eleonore – :
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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Katherine Tsai – :
2″ filter is too big for ASI533, you can choose 1.25″ instead.
Yes it can.
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Daniel – :
Thread size on 2 inch filter frame?
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Katherine Tsai – :
M48*0.75
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Peter Barker – :
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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Katherine Tsai – :
https://astronomy-imaging-camera.com/tutorials/best-back-focus-length-solutions-55mm.html
Hope this help.
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Nick – :
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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Katherine Tsai – :
I recommend you 2″ filter.
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Phurich – :
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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Katherine Tsai – :
1.25″ filter for ASI224 and 2″ filter for Nikon D5100.Do not worry it can be used.
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Victor Iniguez – :
Would this work with the Celestron RASA 11? It’s at f/2.2 620mm focal length.
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Katherine Tsai – :
It may fail with fast ratio.
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Stefan – :
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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Katherine Tsai – :
Yes it is suitable but you need to pay attention to your sensor size.
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Michael – :
“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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Katherine Tsai – :
Sorry It may fail.
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Michael – :
Is it suitable for Hyperstar systems (684mm / F1.9, C14 EHD)?
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Katherine Tsai – :
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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Star Hunter – :
It is pass H-beta line?
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Katherine Tsai – :
Yes it is.
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