- Size and mounting: 3.2 cm diameter filter that easily snaps onto standard 1.25-inch eyepieces and is housed in a solid, protective shell for durability in the field. - Optical quality and coatings: Double-sided fine polishing and polishing process delivers high optical parallelism for consistent performance across the face of the filter. The filter uses a double-sided multilayer coating, with the back side designed to increase light transmission and reduce reflective light for clearer, higher contrast views. - Substrate quality: Precision polished substrates provide good parallelism and precise surface quality to preserve image integrity and alignment within the optical train. - Filter purpose and benefits: This 1.25-inch UHC filter is designed to improve the image contrast of the observed subject, helping to reveal faint detail by suppressing unwanted ambient light. - Compatibility and usage: Fits standard 1.25-inch eyepieces and compatible accessories, making it a straightforward upgrade for existing optical setups. - Practical use scenarios: - Visual observation of deep-sky objects such as emission and planetary nebulae, where contrast is enhanced and details become more visible. - Astrophotography using a 1.25-inch filter to boost contrast in faint targets, helping to capture more detail in fewer frames. - Observations from moderately to heavily light-polluted locations, where contrast improvement helps separate objects from the sky background.