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.
Jim Amos – :
Is there a minimum “focal ratio” that you recommend staying above for a 1.25″ Duo Band with a 4/3 OSC sensor? I’ve tried this with an f/2 lens and I am getting large “halo donuts” in the image circle.
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Jim – :
Is there any formula or usage guide on focal ratio and filter/sensor size using the 1.25″ filter (just in front of a 4/3 sensor)?
I’m getting some large “donut halo’s” from using an f/2 lens (which is understandable), and I’m wondering what is the recommended minimum focal ratio for this filter class.
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chole le – :
Hello! Can you tell me what telescope you are using?
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George Holub – :
Just to confirm that this filter has an M48x0.75 MALE thread? Thanks!
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chole le – :
Hello! Is your issue resolved? If not, please email us at support@zwoptical.com with further details. If your issue has been resolved or if you have any other questions, feel free to contact us anytime. Thank you for support!
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Leo – :
Hi I got a Nikon d5300, and somehow I can’ t find a way to fit his one in unless using a filter drawer with 2″ filter. I bet the 1.25in filter just won’t fit in Nikon F mount cameras, right?
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chole le – :
Hello! Is your issue resolved? If not, please email us at support@zwoptical.com with further details. If your issue has been resolved or if you have any other questions, feel free to contact us anytime. Thank you for your message and support!
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Mike C. – :
Does the 1.25 inch filter require the EFW Filter Wheel to attach to the camera / scope or are there other attachment options? I have an ASI533 Pro MC.
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sara.liu – :
There is a 1.25″ nosepiece in the 533 box, please remove the T2 ring, and screw the 1.25″ nosepiece to use 1.25″ filters.
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Celso – :
Hello: I am interested in a asi1600gt. What filters do you recommend? Are dual band filter 1,25″ compatibles and recommendables? The tube is a TS Optics – Imaging Star 70 mm f/6.78 quadruplet ED in a EQ6 mount. Do you think it is a suitable camera for my team? Thank you.
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sara.liu – :
For the 1600GT, I think LRGB 1.25 is more suitable. The Duo-Band Filter is for color camera.
The 1600GT is suitable for your team.
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Andre Cajolais – :
Hello
I’m starting to use a DuoBand filter – lent by a friend for testing – with my ASI294 Pro and I have serious problems with my Flats… Searching on the web, I realize that several have the same result. Is it due to the sensor of the 294, the light plate used, or the filter itself… (Optolong L-Enhance) I was thinking of getting your Duoband filter which has very good reviews…to replace the Optolong…Do you have any questions about this? If so, is there a solution? Many thanks for reading. AC
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sara.liu – :
Please use sky flat to calibrate.
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Chris – :
Hi.
I have the ASI533 and would like to get the 1.25″ Duo Band filter.
Question 1: Would this filter work with a Canon lens 70-200 f/4?
Question 2: Would this filter work with a 17-50 f/2.8 lens?
Thanks very much.
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sara.liu – :
1: yes
2: yes
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Mikolaj – :
What will be the effect if I use this filter with a modified SLR and will it work with the 135mm f2 lens and asi294?
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Support@ZWO – :
I don’t know about your modified SLR but you can use 2″ with 294.
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sagarinku – :
Hi, i am using WOZ73iii telescope with 73R flatterer and ASI 294MC pro colored camera which size should i go with 2″ and how to connect filter – i can read in above comments “use T2-1.25 filter adapter” but in link 294mm camera is shown , i want to know how to install filter in 294MC pro – method – steps – appreciate your help, as on youtube i didnt find any video – thanks in advance.
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Support@ZWO – :
If you want to use 1.25″, your telescope should be >F7. And install filter is so easy, you will know when you receive it, there is no such method/steps.
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Jonathan Stockdale – :
For the ASI2600 Colour, which filter size is best if it’s right next to the camera? 1.25?
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Support@ZWO – :
1.25 is not suitable for 2600.
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Laxmi – :
Telescope: 250mmAPO,F4.9 (WO Redcat)
ASI294MCPro and Canon EOS5D ii cameras
Duoband filter size: ? , Please.
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Support@ZWO – :
2″.
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Naren – :
Hi, For redcat 51 and ASI294MCPro/ Canon 5DII. Do you suggest 1.25 or 2 inch duoband filter.
Thank you.
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Support@ZWO – :
Yes.
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Aziz Ali (verified owner) – :
How far should the filter be from the sensor?
I have a zwo asi183mc pro and 1.25″ duo-band filter.
Thanks
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sara.liu – :
The closer the better.
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Mike – :
The specs list 3 OIII bands, but isn’t the 486nm Hydrogen Beta?
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ZWO.Moson – :
The dual band pass nature of the Duo-Band filter passes light at Hα (656nm) and OIII (500nm) wavelength.
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Bill – :
Which size for William Optics Zenithstar 73 and ASI183MC Pro?
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ZWO.Moson – :
2″ Duo-Band filter will be better for your telescope.
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byung-joo you – :
Telescope: 80mm / F6 / 480mm
Reducer: X 0.8
CCD: ASI 294MC PRO
You need a filter size available.
1.25 inches?
2 inches?
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ZWO.Moson – :
2″ filters will be better.
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byung-joo you – :
HI~!!
I have a question.
Telescope: 80mm / F6 / 480mm
Reducer: 0.8
Camera: ASI 294MC PRO
1.25 inches? 2 inches? Which one should I use?
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ZWO.Moson – :
2″ filters will be better.
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Philippe Barraud – :
Hi,
On the telescope side I have à M 48mm male thread connector. Which filter diameter is correct with a ASI533MC Pro camera, 2″ or 1.25″ ?
Best regards
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Katherine Tsai – :
1.25″ is enough.
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Nikolay Dubkov – :
hi! i have asi1600mc-cool. i need advice about size of filter. 1.25 or 2″?
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Katherine Tsai – :
1.25″ filer will not have vignetting up to F4.
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