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Optolong CLS CCD Light Pollution Filter

In Stock - Ships Today if Ordered by 5pm! (Mon - Fri)
Filter
Optolong
OPTOLONG-CLS-CCD-1.25
The Optolong CLS-CCD broadband filter is designed to improve the visibility of various deep-sky objects by selectively reducing the transmission of wavelengths of light pollutants, specifically tho...
$135
*Size


The Optolong CLS-CCD broadband filter is designed to improve the visibility of various deep-sky objects by selectively reducing the transmission of wavelengths of light pollutants, specifically those produced by artificial lighting including mercury vapor lamps, both high & low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow). The filter is highly transparent in the main nebula emission lines at OIII(496nm and 500nm), H-beta (486nm), NII(654nm and 658nm), H-alpha(656nm) as well as SII(672nm). It's suitable for enhancing the contrast and details in light-polluted areas.

Main Use and Performance

CLS-CCD is different from the CLS filter, with an infrared wavelength 700-1100nm cut-off. It's fit for color CCD cameras and modified DSLRs for astrophotography.

It works well on most emission nebulae, planetary nebulae and supernova remnants.

You will see a noticeable boost in contrast and visibility of the fainter outer nebulae detail. 

Note that light pollution filters do not eliminate the effects of light pollution or increase the object's brightness. In many cases they instead increase the contrast between nebula and night sky.

WARNING: This filter is not designed for sun observation.

 

2. CLS-CCD Spectrum for Reference

 

How to read the chart?

▲The horizontal axis is the Wavelength in Nanometers(nm).

▲The vertical axis is transmission in %.

▲The RED line shows the transmission of the filter. The artificial emission lines are shown in ORANGE and the emission lines from imaging and observation targets are shown in GREEN.

 

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.