Baader H-alpha 7nm CCD Narrowband-Filter 50x50 (3mm glass thickness) Square $339.00,  Baader Planetarium FHALN-SQ50,Telescope Accessories Accessories, Online Store
Secure website, verified, safe for online shopping
The World's Largest Selection of Optics for Astronomy, Sport, Science and Education
Shop By Price
Shop By Interests
Gift Certificate



  Baader Planetarium Telescope Accessories Accessories
Tell Friend  

Baader Planetarium
Other products by Baader Planetarium
Similar items
Baader H-alpha 7nm CCD Narrowband-Filter 50x50 (3mm glass thickness) Square

Enlarge Photo
Sale Price: $339.00
Buy  Now!

Baader 50mm square narrowband H-alpha filter-7nm #2458383R-imaging filter FHALN-SQ50

Item No. 724-58665
Manuf. No. Baader Planetarium FHALN-SQ50

Eligible for Scope City Rewards at Check-out

Baader Planetarium - H-alpha 7nm CCD Narrowband-Filter 50x50 (3mm glass thickness) Square, FHALN-SQ50

This Baader Planetarium Narrowband 7nm H-alpha Filter is 50X50X3 Square Unmounted, unmounted.

CCD imagers will find Baader's Premium Narrowband CCD passfilters to deliver the absolute highest contrast deep sky images in H-Alpha, H-Beta, Oxygen III, and Sulfur-II, with the shortest exposures possible. Their ultra-narrow bandwidths have extremely high transmissions, while completely rejecting light pollution as well as the important blocking of longer wavelengths.

The high optical quality of the Baader narrowband filters guarantees no loss in sharpness or contrast. Each substrate is fine-optically polished plane parallel to deliver a smooth and accurate 1/4 wavefront over the entire surface. This special custom polishing operation sets Baader filters apart from the standard commercially precision polished filter substrates used by most other filter manufacturers.

In addition to their transmission properties, the Baader coatings were developed with another key goal in mind - eliminate the annoying reflections present in other narrowband astro-filters. To achieve this freedom from reflections, along with excellent out of band blocking, required careful design and testing of the coating stacks.

Coatings are professionally applied in Germany by the most sophisticated equipment available today, ensuring high consistency for bandpass centering, transmission, and out of band blocking. The anti-reflection coatings are designed to prevent halos and balanced to prevent physical deformation of the optically flat substrates. The ultra-hard ionbeam deposition ensures the coatings will never degrade from use or normal cleaning. Each filter is coated individually, permanently sealing the coating edges, in order to guarantee lifetime coating durability and uniformity. Baader mil-spec coatings won't degrade, peel or flake off, unlike the coatings of filters that have been simply cut out of pre-coated sheets of glass. This cutting operation leaves the coating edges rough and torn which enables penetration of moisture between the coatings and substrate.

These filters are available in three sizes, standard 1.25", 2", and a 50.8mm diameter bare substrate (unmounted) for use in SBIG STL cameras. A new unmounted 50mm square version of the H-a filter is now available for large format cameras (H-b, O-III, and S-II 50mm Square filters are due in late summer of 2009). Clear parfocal filters are also available to assist in focusing.

Need Help? To Place an Order: Please Shop Online,
Visit Any Scope City Center or Call Us Directly at 1-800-235-3344

Scope City 100% Satisfaction Guarantee

Scope City unconditionally guarantees that you will be 100% satisfied with your mail order purchase, or just
return the merchandise in original condition within 15 days for a Full Refund, less shipping and handling charges!