Hot
New
Out stock

Red 5nm Continuum Narrowband Filter

SKU:

VENDOR: Astrodon

$380.00

1.25in (Mounted)
31mm (Mounted)
36mm (Mounted)
49.7mm Square (Unmounted)
49.7mm Round (Unmounted)
PRODUCT INFORMATION
price match
Frequent Questions
CUSTOMER REVIEWS
PRODUCT INFORMATION

When it comes to Narrowband filters, no one knows more or does it better than Don Goldman of Astrodon Filters. Narrowband (NB) filters enhance contrast of emission objects by accepting only a narrow range of wavelengths around the emission lines of hydrogen (H-a, 656 nm), oxygen (OIII, 501 nm), sulfur (SII, 672 nm) and others.

Astrodon filters can be used to image when the moon is up, thereby extending imaging time and can be used in light-polluted locations.

The narrow range of wavelengths of Astrodon filters is defined as the FWHM (full-width at half- maximum intensity). Narrower filters decrease the background noise. However, narrower filters are more difficult to manufacture consistently, and are thus more expensive. Furthermore, it is difficult to maintain high transmission through the bandpass of the filter as it becomes narrower. If the peak transmission decreases as the filter is made narrower, the emission signal decreases and the gain in S/N (signal-to-noise) is not realized. Astrodon has achieved this goal of high transmission for narrower filters.

Astrodon has evolved its narrowband product line from 6 nm to 5 nm FWHM, significantly lowered the prices on all filters, and added the ultra-narrow 3 nm FWHM filters for H-a, OIII and SII. We added a Red Continuum filter (645 nm, 5 nm FWHM) that produces a star map without the H-a or SII emission in order to subtract stars from emission images. Astrodon NB filters are renowned for not producing halos around stars and not leaking NIR light.

The 3 nm FWHM filters are stocked and are not custom ordered. The 3 nm OIII filter provides the best protection from the effects of moonlight, producing half the background signal of a 90-percent T, 6 nm FWHM filter, resulting in an increase in S/N of ~21-percent. This will even be larger in comparison to wide 7 or 8 nm FWHM filters.

Most imagers do not realize that their 4.5 – 10 nm FWHM H-a filter for 656.3 nm also includes NII emission at 658.4 nm. These emission lines are so close together that only a filter with 3 nm or less FWHM can readily separate their signals. Professional astronomy papers will state H-a + , signifying that data from both emission lines are combined in the signal. The brackets refer to as a forbidden transition, such as . Many objects are enriched in nitrogen and have emission, such as planetary nebula, Wolf-Rayet bubbles and supernova remnants. The Dumbbell Nebula, M27, is a classic example.

 

Astrodon Narrowband Filter Features:

  • Peak transmission guaranteed >90-percent assuring you of the highest performance.
  • Bandwidths of 5 nm for general use and 3 nm for highest contrast, moonlight rejection and light pollution rejection
  • > OD 4 (0.01-percent T) out-of-band blocking
  • Hard-oxide coatings on clear 1/4-wave substrates go to the edge, eliminating uncoated rims that leak light.
  • Sides are blackened to minimize reflections
  • 3 nm filters can be used with fast optical systems to f/3 with little signal loss
  • Parfocal with all Astrodon filters
price match

We work very hard to ensure that we offer the absolute best prices online.  If you find another online store that offers a lower price then us within six months of your purchase date please let us know and we will refund your original payment for the difference.  We want you to feel confident that you are getting the absolute best price for the product you are ordering.  If you find that our own website has a lower price for the same item you have ordered within six months of your purchase date will refund the difference as well.

To request your partial refund simply e-mail us a link to the same product on our website, or on our competitors website within six months from the date of your order and we will process the credit accordingly.

Our 100% Price Guarantee has some limitations:

  • You must purchase the item from our website before requesting your Price Match Guarantee
  • Promotions such as rebates and buy one, get one free offers are not eligible
  • The item must be in stock on the competitors website
  • The competitor must be an online store, they may not have a retail location
  • The website can not be a discounter or auction website (ie; eBay, overstock, etc..)
  • The competitor must be an Authorized Retailer of the product in question
  • The Price Match Guarantee includes the item price and the shipping charges, it excludes sales tax
Frequent Questions

Order Confirmation:

As soon as you place your order, you will receive an order confirmation e-mail.  This means that we have received your order in our system and pre-authorized your credit card for the purchase.  As soon as we receive your order, we automatically reach out to our suppliers to confirm that it is in stock and available for immediate shipment.  If your item is on backorder or unavailable, we will void the pre-authorization and reach out to you via e-mail.  If your item(s) are available for immediate shipment (within 5 business days), we will process the charges and submit the order for shipment.

Order Shipment:

If your order is stock and we process the charges to your credit card, it will ship within five business days from the date of your order.  We will send you tracking information within 24 hours of your order leaving the warehouse to the e-mail address you provided when checking out.  If you do not receive tracking information from us within six business days of your order, feel free to follow up with us at support@hyperion-astronomy.com

Damages:

Please inspect the packaging of your item(s) when they arrive, if you notice any damage you should make note of it when signing for delivery.  If your item(s) do arrived damaged, please send photos support@hyperion-astronomy.com

 and we will process an insurance claim on your behalf.

Cancellations & Refunds:

 If you order has shipped, you (the buyer) will also be responsible for actual return shipping charges. Refunds will only be issued to the original credit card that you use when placing your order.

CUSTOMER REVIEWS

Customer Reviews

No reviews yet
0%
(0)
0%
(0)
0%
(0)
0%
(0)
0%
(0)
Someone purched a47 minutes ago from Moscow, Russian
Someone purched a48 minutes ago from London, Great Britain
Someone purched a49 minutes ago from Amsterdam, Netherlands
Someone purched a50 minutes ago from Berlin, Germany
Someone purched a51 minutes ago from Rome, Italy
Someone purched a52 minutes ago from New York, USA
Someone purched a54 minutes ago from London, Great Britain
Someone purched a55 minutes ago from Amsterdam, Netherlands
Someone purched a56 minutes ago from Berlin, Germany
Someone purched a57 minutes ago from Rome, Italy
Someone purched a59 minutes ago from Moscow, Russian
Someone purched a60 minutes ago from London, Great Britain
Someone purched a23 minutes ago from Amsterdam, Netherlands
Someone purched a24 minutes ago from Berlin, Germany
Someone purched a26 minutes ago from New York, USA
Someone purched a28 minutes ago from London, Great Britain

This is a standard cookie notice which you can easily adapt or disable as you like in the admin. We use cookies to ensure that we give you the best experience on our website.

Red 5nm Continuum Narrowband Filter

Red 5nm Continuum Narrowband Filter

$380.00
Pre-loader
★ Judge.me Reviews

Let customers speak for us

36 reviews
86%
(31)
14%
(5)
0%
(0)
0%
(0)
0%
(0)
Prism software

I'm new to Astrophotography and was looking for someway of controlling telescope and Observatory and found Prism . I found it easy to setup easy to use I can recommend this .

Great Telescope

Easy to put together and easy to use for a beginner. I had to use the included spacer to get my 1.25" eyepieces to focus properly in case you're having that issue.

powerful device

very reliable, strong, and dependable

PRISM software - the benefit of the full integration

I'm commission a site for serius observations and there are a lot of requirements and technologies to be harmonized and so many areas of post-processing that require dedicated software that you can really get lost. PRISM is open and allows full integration of any equipment in few mouse clicks with an impressive set of analysis and post-processing and automation tools that can drive efficiently you into a professional experience of the sky wonders.

Best Choice Around

Software is very well thought of and is packed with anything you would ever need.
The interface is gorgeous, it integrates well all the features.
Price is very convinient; I am very glad that Hyperion does not require a subscription fee, like others unfortunately do.
I don't give a 5 star because the pointing model for Alt/Az mounts is unavailble.