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Astromania 1.25" NBPF filter suitable for visual observation on most emission nebulae, planetary nebulae and supernova remnants. Bright nebulae can be viewed more clearly using NBPF filter in conditions of light pollution.
12nm Narrowband NBPF Hydrogen Filter
1.25" Narrowband filter is designed for nebula observation allowing 12nm bandwidth of light centered on a wavelength of 660nm to pass through, 90% transmission at H-alpha line 656nm - whether under dark skies or under the sky glow of a city. That means the filter also blocks the infamous stray light and light from mercury and sodium vapour lamps.
Astromania 1.25" NBPF Hydrogen-A 12nm Filter - Good and Trustworthy Partner
R. N. Shagam
Reviewed in the United States on February 9, 2021
As far as it goes, the filter apparently does block light in the visible band, while letting through the desired 12nm bandpass at 656nm (H-alpha). However it does transmit near radiation (NIR) at 940nm--this I tested using an IR remote control and my ASI294MC Pro camera. I could also observe the IR diode with my cellphone camera. In combination with a UV/IR cut filter the IR remote signal was blocked. I discovered the problem the hard way while imaging a nebula that was near a magnitude 3 star--the star image was impossibly bloated after processing the image. Bottom line: you will need both the UV/IR and the H-alpha filters in place if you truly want to have narrowband operation with a quality astrocamera that does not have its own IR cut filter. (Edit) However, I have found that when stacking a two filter combination, I get ghost reflections on bright stars in the field of view. Some day, I'll have to pop for a more expensive H-alpha filter that includes an IR block layer.
Kevin W
Reviewed in the United States on July 15, 2020
The ‘2 inch’ filter cell has standard threads on both sides, M48, female on one side and male on the other, so that it can be attached between the camera and the telescope.I had the filter for weeks, waiting for an opportunity to use it. When I finally did, I found that the threads on the ‘male’ side are fine, but the ‘female’ side threads are bad. The filter binds up after only being screwed on 1/4 of a turn. Either the threads were badly cut, or they used M48-0.6 threads instead of (the kind-of standard) M48-0.75 threads.Unfortunately the Astro community can’t seem to agree to standard thread sizes for anything. So I’ve got a ziplock bag full of adapters to allow different accessories to be connected.And I have other 2 inch filters, so I’ll probably just do a swap, and unscrew the filter cell and transfer this filter into a different cell with better threads.Edit: After further examination, I found that the problem isn’t the threads per se. The problem is that the filter retaining ring is too thick. The retaining ring uses up most of the female threaded section of the cell, leaving only 1/2 of a full turn of thread remaining. So when you try to attach an adapter, there isn’t enough thread to get a solid connection.My plan is to carefully sand-down the retaining ring so that it’s not so thick, and leaves more exposed thread for the adapter/coupler.Needless to say, I shouldn’t have to do this, but in the long run it’s less hassle.
James Houghton
Reviewed in the United States on June 30, 2020
It is a good filter for the price. So far I've used it successfully to gather data for a luminance layer for Iris nebula. I'm waiting for better conditions to try it out with my SII and OIII filters. But so far I am pleased.
Greg
Reviewed in the United States on May 28, 2020
Great filter for narrow band color photography. Add these photos to Oxygen III filters photos and stack with straight color photos for a great result.
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