ZWO narrowband 1.25″ filter

$129.00$369.00

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Product Description

Narrowband filter do not eliminate the effects of light pollution or increase the object’s brightness. In many cases, they increase the contrast between nebula and night sky, not brightening the nebula.

It can reduce the transmission of certain wavelengths of light, specifically those produced by artificial light including mercury vapor, and both high and low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow).

The ZWO  H-Alpha filter  has a bandpass of  7nm and passes light at 656nm  wavelength, light transmission rate comes up to 80%. Best choice of narrowband H-alpha astrophotography filter for high-contrast imaging and revealing rich details of the nebula even in areas with strong light pollution, just prepare to experience the infinite fun with it !

Technical Parameter:

Name: ZWO narrowband 1.25″ filter

Size: 1.25″

Thickness: 5.5mm+3.5mm(thread)

Thread: M28.5*0.6 male thread

1-25ha

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 tricolor CCD astrophotography.

 

1-25sii

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

1-25oiii1

Technical Data

FWHM:7±0.5nm
Glass Thickness 1.9+/-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 )

here is the the transmission curve

HSO curve

Shipping

  • Fast Shipping(amount ≧ 299USD) for free
  • Fast Shipping(amount < 299USD) : $20.00
  • Free Shipping(amount < 299USD) (Air Mail, 3-4 weeks) (Free)

Introduction

  1. Fast Shipping: we will choose DHL, UPS, TNT, EMS etc to deliver it. Usually you will get your package in one week. We provide free fast shipping for order ≧ $299 or charge extra $20 for order < $299.
  2. Free Shipping: we will ship via DGM or China Post Registered Air Mail. It usually costs 2-3 weeks to reach US or Europe and costs 3-4 weeks to reach far places.
  3. Customers from Brazil and Chile should leave a message to provide your CPF or CNPJ as your custom needs it.
  4. Customers from Russia need to provide the name of your company.

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 areliable 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 or replace for free if the camera doesn’t work within warranty period. After the warranty period, we will continue to provide repair support and service on a charged basis.
  • 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 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.
  • For customers who bought the camera from our dealer, dealer is responsible for the customer service for you.

Before first usage of this product read manuals and install correct drivers and software.

Do you have uestion, answer or comment? Post here!

  1. :

    Hi!
    When schedules are shown?

    • Sam Wen

      :

      they are already ready

  2. :

    Hi, how would u rate ur narrowband filters to that of astronomik or baader ? will they enhance the pic on my unmodded dslr?

    • Sam Wen

      :

      the unmodded DSLR has problem with H-alph

  3. :

    hello!

    is this set parfocal?

    • Sam Wen

      :

      the thickness is very close, but parfocal depends on scope

  4. :

    Hi Sam!

    Are these filters as thin as the LRGB specific for the ASI 1600?
    Can I combine the Ha with the RGB set on a f7.5 telescope without refocusing between filter and filter?

    Thanks in advance

    • Sam Wen

      :

      yes, they are same thickness, but you may don’t need to refocusing as f7.5 is really long enough

  5. :

    Hi!

    Can you please show a transmission curve for these filters? I’m interested in an amount of off-band transmission.

    Thanks!

    • Sam Wen

      :

      we will upload soon

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