Brand
Camera filters, and one monocular
The Natural Night filter screws into a 67 mm camera lens thread. It is made for nightscape work — a camera on a tripod under a sky spoiled by street lighting — and not for an eyepiece or a telescope drawtube.
It attenuates a narrow region of the spectrum where sodium lighting sits. On this site a filter is compared on its published curve rather than on its name, and a filter that gives a wavelength range can be compared with one that does not.
A 12x50, judged like the rest of its shelf on aperture, magnification and exit pupil.
Check the thread. A camera filter thread and a telescope filter thread are different families, and neither adapts to the other by being screwed harder.
12x · 50 mm · 4.2 mm exit pupil · IP68
A 12x50 monocular with a fully sealed nitrogen-filled body rated IP68 to ten metres, BAK4 prisms and a raisable eyepiece for spectacle wearers.
Best for: Wet-weather use where a sealed instrument is worth more than an extra millimetre of exit pupil
≈ $45 / £40 / €50
A 67 mm photographic light-pollution filter blocking the 580 to 610 nm region of common artificial lighting, with a 28-layer nano coating on both faces.
Best for: Wide-field tracked photography with a camera lens under sodium-lit skies
Any figure written into the body of this page was true on the day it was written. The amount shown next to each instrument is requested from the retailer as the page loads, and it is that amount, not the text, that stands.
