Brand
Camera filters, and one well-sealed monocular
K&F Concept is known for camera filters. Its two products here reflect that.
The Nano-X Natural Night 67 mm screws onto a 67 mm camera lens. It blocks artificial light between about 580 and 610 nm, the sodium band, in Japanese optical glass with a 28-layer coating on both faces. It is a nightscape filter, not a telescope filter, and it does little against white LED lighting. Amazon.com had no current price for it on November 7, 2026.
The KF33.075 is a 12x50 with a BAK-4 prism, FMC coatings, a 263 ft field at 1000 yd, a 1/4-inch tripod socket and an IP68 rating to 10 meters, the deepest sealing on the monoculars shelf. It cost about $45.
Check the thread. A 67 mm camera thread and a 1.25-inch telescope thread belong to different families and do not adapt to each other.
12x · 50 mm (1.97 in) · 263 ft at 1000 yd · BAK-4 · FMC · IP68 to 10 m · 1/4 in tripod socket
K&F Concept's KF33.075 12x50 monocular: BAK-4 prism, fully multi-coated optics, a 263 ft field at 1000 yd, an IP68 body rated to 10 meters, an adjustable eyecup and a 1/4-inch tripod socket.
Best for: Wet-weather use where a sealed instrument is worth more than an extra millimeter of exit pupil
≈ $45
K&F Concept's Nano-X Natural Night filter: a 67 mm camera-lens filter that blocks sodium streetlight wavelengths of about 580 to 610 nm, in Japanese optical glass with a 28-layer coating on both faces.
Best for: Wide-field tracked photography with a 67 mm 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.
