They pass the lines the gas emits and block the rest · review
A filter titled UHC and described in its own features as narrowband wavelength isolation — with threads on both faces for stacking.
The title: UHC Filter for Telescopes.
The sixth feature: Narrowband Wavelength Isolation.
Those are the two halves this shelf divides into. A UHC passes a wide window holding several emission lines and leaves the stars in place. A narrowband passes a slice a few nanometers wide and takes almost everything else away.
Different behavior, different price, different objects.
No wavelength and no bandwidth are published, so the page gives no way to tell which this is. Both claims are printed above.
The only stackable filter on this shelf.
An ordinary filter has one usable thread, which is enough to screw it into an eyepiece. This one has M28.5 × 0.6 on both faces, so a second filter goes behind it — the listing names polarizing and Moon filters.
That is why the thread specification matters more on this page than on any other here: stacking only works if both threads are the same, and this is the only listing that names the thread and advertises the practice.
A transmission figure, which nothing else on this shelf offers.
It is also not the figure the shelf has been asking for. It sits in the sentence about multi-coated glass maximizing light transmission, so it describes the substrate and its coatings — how much of the light the filter means to pass gets through the glass.
The missing number is transmission at a named line. A filter passing hydrogen-beta at ninety-five per cent is a different instrument from one passing it at seventy, and the published page for the Explore Scientific here names that percentage as the other half of a filter specification.
This is not that. It is still more than the rest of this shelf publishes.
The two streetlight sources, named.
Sodium emits a hard pair of lines in the yellow; mercury emits in the blue and green. A filter that blocks both removes most of what a town puts into the sky, and naming them says more about the design than “light pollution” does.
Three objects are named on the other side of the ledger: Orion, the Lagoon, and lunar crater detail.
The fourth feature offers the filter for terrestrial photography with enhanced clarity.
A filter cut to pass two gas emission lines and block the rest of the spectrum will make a daylight scene an unusual color. Whatever it does there, it is not clarity in the sense the sentence implies.
It is the one claim on this page that the rest of the page contradicts.
American Amazon store sat at about $19 on the day of the survey.
Figures as Keepa reported them on the day this page was last updated. Stock and pricing shift without warning.
Prices quoted in this text were read on October 7, 2026. The live price is at the top of the page.
Same aisle, closest price — what the same spend else shows.
| Bandpass and type | The title says UHC. A published feature says narrowband wavelength isolation, stated to isolate key wavelengths including H-beta and O-III emissions · Those are the two opposite categories on this shelf, and no wavelength in nanometers and no bandwidth are published |
|---|---|
| Line transmission | Not published by the maker. · Light transmission is claimed as greater than 90%, attributed to the multi-coated glass rather than to any named line |
| Blocking outside the band | Stated to block sodium and mercury streetlight glare, and to suppress artificial light · No figure or optical density is published |
| Thread size | Dual M28.5 × 0.6 threads, one on each face, stated to let multiple filters be connected in series — the only stackable filter on this shelf |
| Glass flatness | Not published by the maker. |
| Coatings | Multi-coated optical glass, stated to maximize light transmission and reduce reflections · The number of layers and the faces treated are not given · Aircraft-grade aluminum, as the maker words it, with a protective storage case included |
| Amazon reference | B0D1TWF7GZ |
| EAN | 0755496189554 |
The listing says both and this page chooses neither. The title reads UHC Filter for Telescopes; the sixth published feature reads Narrowband Wavelength Isolation. Those are the two categories this shelf is divided into: a UHC passes a wide window holding several emission lines and keeps the stars visible, while a narrowband passes a slice a few nanometers wide and removes almost everything else. They behave differently, cost differently and suit different objects. With no wavelength and no bandwidth published, the page offers no way to tell which this is.
Less than it appears. The figure sits in the feature about multi-coated optical glass maximizing light transmission, so it describes the glass and its coatings — how much of the light the filter is meant to pass actually gets through the substrate. It is not a transmission at a named line, which is the figure that separates a good narrowband filter from a poor one: a filter passing hydrogen-beta at 95% behaves very differently from one passing it at 70%. The published page for the Explore Scientific on this shelf names that missing percentage as the other half of a filter specification. This figure is not it, and it is more than the rest of this shelf gives.
Stacking. A standard filter has a male thread on one side and a female on the other, which is enough to screw it into an eyepiece — but a filter with a usable thread on both faces can take another filter behind it, so a light-pollution filter and a Moon filter can sit in the same barrel. The listing advertises exactly that, naming polarizing and Moon filters. It is the only filter on either half of this shelf to do so, and it is the reason the named M28.5 × 0.6 thread matters on this page more than on any other.
This model is listed on Amazon.com, at ≈ $19 at the last reading. Listed is not the same as in stock: availability changes daily, and the buy box shows the live price.
Details checked on October 7, 2026.
An urban observer who wants to stack a Moon filter behind a light-pollution filter
Specifications: the manufacturer sheet for telescopes and observing optics and the matching Amazon product page. Prices and availability: Keepa. Every figure on this page names its source.
UHC · M28.5 × 0.6 thread · aluminum alloy frame · waterproof coating · no passband published
A UHC filter whose published features include a first-person account of seeing the Orion nebula — and no wavelength anywhere.
Best for: A first nebula filter for a light-polluted sky, bought on price with the specification taken on trust
≈ $23
H-alpha narrowband · 1.25 in · hardened multi-coatings · no bandwidth published
A narrowband hydrogen-alpha filter whose bandwidth — the one figure that defines a narrowband filter — is never published.
Best for: Imaging hydrogen regions, by somebody who will ask the seller for the bandwidth before buying
≈ $70
UHC · 1.25 in standard thread · optical glass in an aluminum frame · anti-reflection coatings · no passband published
A UHC filter that explains correctly what the category does, names the nebulae it suits, and publishes no wavelength at all.
Best for: An observer in a suburban sky who wants the effect explained before buying, and will take the glass on trust
≈ $32
