I live in a Bortle 5 neighborhood with the nasty LED streetlights all across my community. I am trying to image nebulas and galaxies with my Canon EOS Rebel T6 + Pentax 130mm lens from my community.
I read that the IDAS LPS D2 filter handles LED lights well. But it is expensive.
Does anyone have any experience with this filter? Are there other filters that might help my scenarios?
Gradient reduction in processing. It identifies light pollution by spatial variation (worse at the horizon, better overhead), rather than take a meat axe approach of chopping out parts of the spectrum. Works on all sources of light pollution, all targets. A good tool is available in Astro Pixel Processor, and other astro specific processing programs.
Pretty much all serious imagers use gradient reduction. Some will, in addition, use a broadband LP filter, some won't. Pretty much all who do use them on emission nebulae only.
I see. If I wanted an exclusive filter for nebulae imaging using my DSLR, would a UHC filter work? Or should i stick to a more selective line filter? There are so many choices, its hard to decide
The new duo band and triband filters are quite popular, for good reason. Designed for emission nebulae and one shot color cameras, they're a compromise between narrowband filters (which work well, but pretty much require a mono camera) and broadband LP filters.
Here's an inexpensive one.
But, as others have noted, an unmodified DSLR is poor for imaging emission nebulae, in any event. It may not be "essential", but modifying your camera, or getting an astro specific camera (which is outside your budget) is more important than a filter. The filter above won't do much on an unmodified camera.
In spite of their promising name, these filters are not very magical. Sigh.
Edited by bobzeq25, 19 September 2020 - 10:13 AM.