Best Light Pollution Filters for City Astrophotography of 2026

The Hoya Starscape is the filter we put on a camera lens, not a telescope. It is a 49mm screw-in didymium filter designed to cut the yellow-orange wavelengths from sodium and mercury vapor lights while leaving more of the star field intact than a deep-sky narrowband filter. For wide-field Milky Way work, that balance is the point: you want cleaner contrast without turning the scene into a false-color nebula portrait.

We were pleased by how much the slim aluminum ring stays out of the way on a wide lens; the low-profile frame is there to reduce vignetting, and the 97%+ transmission claim is paired with multi-layer coatings that help control flare. The effect is subtler than a dedicated nebula filter, which is exactly why we prefer it for landscape astrophotography. It improves the separation between stars and sky while keeping the foreground and star colors closer to natural.

The catch is the thread size. This is a 49mm filter, so it only fits lenses with a 49mm front thread; step-up rings can bridge the gap, but they add another surface and another place for flare. It also will not rescue a nebula the way a dual narrowband filter can. We treat it as a specialty tool for wide-field nightscapes, not an all-purpose city filter.

SVBONY's CLS filter is the cheapest way in this set to try broadband light-pollution suppression on a 1.25-inch telescope, and that is a useful thing to be. The 1.25-inch barrel threads onto a standard eyepiece or camera nosepiece, and the glass is coated to pass about 90% of the main nebula emission lines while holding off-band transmission down to roughly 0.1%.

We appreciate the aluminum frame and the clear labeling; it is easy to tell which side goes toward the telescope, and the filter seats without wobble in a standard 1.25-inch adapter. The CLS design blocks the sodium and mercury lines that make up a lot of older city glow, so the sky background drops and faint nebulae gain contrast. For a color CCD or an unmodified DSLR, that can make the difference between a washed-out frame and one you can actually process.

We wish the format were larger. A 1.25-inch filter sits close to the sensor and can vignette on bigger chips, and it needs a 1.25-inch nosepiece rather than a native camera mount. The other limit is the light itself: modern LED streetlights spread across the spectrum, so no broadband filter can erase them. This one is a budget entry, not a cure.

The K&F Concept Nano-X is the 52mm filter we suggest for a lens that already has a 52mm thread and a habit of catching streetlight flare. Its 0.15-inch frame is deliberately thin, so it is less likely to vignette on a wide-angle lens, and the 28-layer coating is there to resist water, oil, and scratches as much as to reduce reflections.

We found the light-pollution effect is gentler than a telescope filter's: it takes the yellow edge off city glow and helps stars sit more clearly against the sky, but it does not turn a Bortle 7 backyard into a dark-sky site. That is the right expectation for a camera-lens filter. We also like that it doubles as front-element protection, which makes it easier to leave on for a night walk.

One caveat belongs before a big shoot: the glass can arrive less than perfectly clear, and a few copies have left smears or marks on images. Inspect it under a bright light and test a frame before you commit; a clean copy is a useful, slim filter, but the copy matters.

Astromania's 1.25-inch UHC filter is the familiar budget answer for someone who wants to see nebulae from a city backyard. It screws into a standard 1.25-inch eyepiece, uses an aluminum frame and coated optical glass, and is priced at the low end of this group.

We suggest it for visual observing first. On bright emission nebulae, the UHC bandpass cuts artificial light and lifts contrast, and the effect is easy to see even without a camera. We noticed the trade-off in the same view: the whole field gets dimmer, and stars can pick up a blue or purple tint. That is normal for an aggressive filter, but it is worth knowing before you point it at a faint target.

The Astromania is not the filter we choose for serious camera work. It has no camera-specific mounting beyond the 1.25-inch barrel, and the image quality is uneven enough that we treat it as a visual and casual afocal tool. If you already have a 1.25-inch focuser and want a cheap way to see whether filtered viewing suits you, it earns a place; if you are building a deep-sky imaging rig, look elsewhere.