Celestron SkyMaster 25x100 Porro Binoculars

The Celestron SkyMaster 25x100 (product ID 47032119984435) pairs 25x magnification with a 100mm objective lens a combination built for serious long-range and astronomical viewing. That 100mm aperture pulls in a huge amount of light, making it capable at dusk, dawn and in dark-sky conditions where smaller binoculars simply can't compete.

Optics use BaK-4 prisms and fully multi-coated lenses with Celestron's XLT coating technology. XLT coatings maximise light transmission across the lens surfaces, delivering sharp contrast and accurate colour. The result is a bright, clear image even when light levels drop. The Porro prism design gives good depth perception and a wide exit pupil of 4mm.

These are large binoculars weighing 3,969g with dimensions of 256 x 130 x 388mm. A tripod is essential for steady viewing at 25x. They are not nitrogen filled and not waterproof so they suit controlled or dry conditions best. The field of view is 52m at 1000m (3 degrees) with 15mm eye relief.

Celestron backs these with a Limited Lifetime Warranty. For amateur astronomers wanting to see star clusters, the moon in detail and distant terrestrial subjects, the SkyMaster 25x100 delivers serious performance at this size and price point.

The 25x100 pairing means 25 times magnification through a 100mm aperture giving a 4mm exit pupil bright enough for night-sky use. BaK-4 Porro prisms deliver high light transmission and natural depth perception. Celestron's XLT fully multi-coated optics reduce reflection losses across every lens surface improving contrast and colour accuracy. The Porro design physically offsets the prisms giving a wider optical path than a compact roof prism. The 3-degree field of view is narrow but standard for this magnification class.

The SkyMaster 25x100 uses BaK-4 Porro prisms and fully multi-coated glass with Celestron's XLT coating. The housing uses materials Celestron describes as superior to lower-priced large aperture alternatives. Exact chassis material is not specified in the product listing. The optics are standard glass no ED elements are used.

Use a soft lens cloth or brush to clean the optics never use paper or abrasive materials. Store in a dry location away from moisture as these are not waterproof or nitrogen filled. Use the carry strap to avoid drops. Keep the lens caps on when not in use. The Celestron Limited Lifetime Warranty requires proper owner care.