Current Price: $139.99
Buy It Now Price: $139.99
Bids: 0

Store category

Sign Up Now !

You may also like

OPTOLONG 2" H-Beta 25nm Telescope Filter Enhance Contrast of Nebulae for Visual Observation

Product Description

Narrowband H-beta filter is designed for nebula observation allowing 25nm bandwidth of light centered on a wavelength of 486nm through, and reducing 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). H-beta emits 486nm and it is a blue-colored filter.

Main Use and Performance:

  • Use with a large aperture telescope under clear and dark viewing conditions with good seeing
  • Suitable for viewing on the faint and elusive Horsehead Nebula and California Nebula
  • 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.
  • WARNING: The filters of Optolong are not designed for sun observation. DO NOT LOOK AT THE SUN WITH OPTOLONG FILTER. You would be BLIND if you fail to observe the warning.

Coating Parameter:

  • Multi-layers anti-reflection coating
  • Non-cementing optical substrate coating
  • Electron-beam gun evaporation with Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL(central wavelength) no deviation affected by temperature change
  • Planetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band

Filter Cell:

  • Ultra-thin filter cell minimize vignetting by maximize possible clear aperture (clear aperture is 45 mm )
  • Aerometal Material | Precise CNC Machining | Sand Blasting Process | Black Anodized Finish | Extinction Treatment to Prevent Reflection | Laser Engraving No Fading

Package Includes

  • 2" OPTOLONG H-Beta 25nm Light Pollution Filter

 

Payment
Brand
Shipping
Feedback
Contact us

Payment

                                                                    

Brand

Svbony focus on telescope and optical accessories. Aim to supply the high quality products and best service to customers. Main items are including Telescope, Monocular, Binocular, Spotting scope, filter, eyepiece and other accessories. We hope that you could enjoy a much more clorful life by using our products.

Shipping

Svbony has set up US/AU/UK/ES/DE/IT/FR oversea warehouses, trying to offer customers speedy best local service. We are a passionate and extraodinary team, committed to offering good products and keeping customers satisfied with their purchase.

Feedback

Our goal is to make sure you are a happy customer and pleasant shopping with us.
If you are satisfied with the purchase and our total service, your comment is very important in our business success. Please take a minute to leave us a positive feedback with an overall Detailed Selling Rating (DSR) of 5
If you are not satisfied with your purchase in any way, Please give us the opportunity to resolve any problem. We understand the concerns and frustrations you might have, and will try our best to resolve the issues.

Contact us

Do not hesitate to
contact us anytime before and after your purchase through the clicking
"Contact seller' and we are committed to your 100% customer satisfaction
or you can contact us

Our working time: 8:00am-18:00pm (Beijing Time). Because of
time-difference, we cannot give you a quick reply sometimes. Please wait
for some more time.

    Feedback

    PushAuction

    On Sep-21-19 at 01:53:50 PDT, seller added the following information:

    DataCaciques

    Filed under: Eyepieces & Accessories