The 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.
Technical Parameter
- Name: ZWO Duo-Band Filter
- Size: Standard 1.25” & 2”
- 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
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;
Kind 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.
At The Widescreen Centre, we prioritize prompt order processing and dispatch. We strive to dispatch all orders on the same day or the next working day, depending on the time of your order. We hold extensive stocks to ensure that your items are ready for immediate despatch. Please note that the cut-off time for same-day dispatch is usually 1:30 p.m.
For delivery within Mainland UK, we use reputable couriers to provide efficient service. You can expect your package to arrive in 1-2 working days. Please note that a signature may be required upon delivery to ensure a secure receipt.
In the case of special order items, the delivery time may be longer. If you have any concerns or questions about the delivery of your item, please don't hesitate to Contact Us. We are here to assist you.
Should there be any delay in dispatching your order, we will notify you to keep you informed.
Please be aware that The Widescreen Centre cannot be held responsible for any postal or third-party delays that may occur. We are committed to providing a reliable and efficient delivery service for our valued customers.
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