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ZWO 3 Piece 31mm Ha/SII/OIII 7nm Filter Set

Estimated Delivery: 7-18 Days (Pre-Order)
Filter
ZWO
NB7nmD31Set
The ZWO H-Alpha filter has a bandpass of 7nm, centred on light at 656nm, with a light transmission of 80%. This is the best choice for narrowband H-alpha astrophotography for high-contrast imaging,...
$565


The ZWO H-Alpha filter has a bandpass of 7nm, centred on light at 656nm, with a light transmission of 80%. This is the best choice for narrowband H-alpha astrophotography for high-contrast imaging, revealing rich details of the nebula even in areas with strong light pollution.31mm-ha600

The ZWO narrowband S-II 7nm filter passes light at 672nm wavelength with a bandpass of 7nm which is designed for nebula observation . It is suitable for visual observation on most emission nebulae, planetary nebulae and supernova remnants.  Use it with H-alpha and OIII narrowband filters (SHO Set) for tri-color CCD astrophotography.

 

31mm-sii600

The ZWO narrowband O-III 7nm filter is designed for nebula observation, allowing 7nm light centered on a wavelength of 500nm through, corresponding to OIII emission lines and blocking out all other light.  Adding the ZWO O-III Narrowband filter to your imaging collection will help you go beyond RGB imaging and will help capture your favorite nebulae in a totally new light, no matter how polluted your skies may be!

31mm-oiii600

  • The Hubble palette can be made using the combination of H-alpha, OIII-CCD and SII-CCD, such as the famous “Pillars of Creation” (M16 Eagle Nebula)
  • Narrowband imaging with a SHO set (H-alpha, OIII-CCD and SII-CCD) can be done with the moon up in heavy light pollution
  • The H-alpha filter is the first narrowband addition to LRGB set for most imagers who blend a black-and-white Ha image into RGB data to enhance structural detail while maintaining a natural look

Ha-side-1

 

Technical Data

  • FWHM:7±0.5nm
  • Glass Thickness 2.0+/-0.03 mm  (1.25”/31mm/36mm)
  • Fine-optically polished to ensure accurate 1/4 wavefront  over the both surfaces
  • About 90% transmission at H-alpha line 656nm (H-Alpha filter )
  • About 90% transmission at SII line 672nm (SII filter )
  • About 90% transmission at major OIII line 500nm (OIII filter )
  • Infrared wavelength 700-1100nm cut-off
  • <0.1% transmission of off-band, OD3(Optical Density)

 

Transmission Curve

NB filters TP

New Narrowband & Old Narrowband Filter Comparison:

New Ha filters are based on new glass base, less reflection( less halo of bright stars).

Ha-compare

 

New SII filters are based on new glass base, less reflection( less halo of bright stars).

SII-compare

 

New OIII filters are based on same glass base, new coating standard, better block rate of off-band.

OIII-compare

 

Here is a test of ZWO Ha Filters (ASI1600 mono camera, single frame, 300s, DDP in MaximDL) :

real test of Ha

Reviews

https://www.cloudynights.com/topic/627187-review-of-the-new-zwo-narrowband-filters-comparison-to-the-old-zwo-and-astrodon-filters/

Returns Policy

You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

Items that have been opened, damaged or are otherwise unsaleable will be subject to a minimum 10% restocking fee, to be assessed by Telescopes Canada upon receipt of the returned goods

You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

If you need to return an item, simply login to your account, view the order using the 'Complete Orders' link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.

Shipping

We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

Typographical Errors and Order Cancellations

Telescopes Canada reserves the right to cancel an order due to an error in pricing by Telescopes Canada or one of our suppliers, equipment being no longer obtainable, or other events which are out of our control.

Client-Initiated Cancellations

Client-initiated order cancellations are accepted prior to delivery of the equipment to the customer, thereafter it is a return.