CCD imagers will find Baader's new Narrowband 7nm H-Alpha passfilter to deliver the absolute highest contrast deep sky images of H-II regions, with the shortest exposures possible. Its narrow 7nm FWHM bandwidth has a transmission at H-Alpha of over 90%, while completely rejecting light pollution.
The high optical quality of the Baader 7nm H-Alpha filter 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. Coatings are professionally applied by the most sophisticated equipment available, ensuring high consistency for bandpass centering and transmission. The ultra-hard ionbeam deposition ensures the coatings will never degrade from use or normal cleaning.
This filter is available in two sizes, standard 1.25" and a 50.8mm diameter bare substrate (unmounted) for use in SBIG STL cameras. 
Size
1.25 Inches , 2 Inches
Type
Narrowband Filters
Brand
Baader Planetarium
Telescope Accessories Series
Filters
Filter Size:
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by PowerReviews(based on 3 reviews)
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Reviewed by 3 customers
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Comments about Baader Planetarium Narrowband H-Alpha Telescope Filter 7nm:
I purchased this primarily for adding Ha to my RGB images that I take with a modified DSLR. I've only imaged NGC 6888, the Crescent Nebula, so far and am extremely pleased with the combined HaRGB image.
Bottom Line Yes, I would recommend this to a friend
Images shared by Terrance
NGC 6888 Ha
Images shared by Terrance
NGC 6888 HaRGB
(2 of 2 customers found this review helpful)
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Comments about Baader Planetarium Narrowband H-Alpha Telescope Filter 7nm:
This Ha filter fits perfectly into 2" threaded adapters for astrophotography. It is very high quality and comes in a great case. I can't wait to do some long exposure astrophotography with my modified canon DSLR with this beautiful filter! Great for narrowband imaging.
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Comments about Baader Planetarium Narrowband H-Alpha Telescope Filter 7nm:
This is an excellent filter for narrowband imaging of emission nebulae. The 7nm bandwidth provides high contrast images and allows you to image even with a full moon. Most filter cells average around 7mm in depth. The cell holding the Baader filter is deeper so this filter may not fit in certain filter holders and filter wheels. Make sure you have adequate space in your filter holder or filter wheel to accept this filter. One solution to this problem is to remove the glass filter (very carefully)from its cell and install it in a thinner filter cell. You will loose the advantage of Baader's extra thin cell wall, which provides the most clear aperture of any 2" filter available but at least you will be able to use this excellent filter. Please note you will have absolutely no problem if you are screwing the Baader onto the barrel of a 2" eyepiece or extension tube.
Displaying reviews 1-3
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