Celestron Regal M2 100ED Spotting Scope

Key features

• 100mm ED (Extra-low Dispersion) objective lens for high-contrast, color-accurate views
• 22-67x multi-coated zoom eyepiece included
• Fully multi-coated optics with XLT coatings for maximum light transmission
• Waterproof and fogproof nitrogen-purged construction
• Angled eyepiece design for comfortable viewing at various heights
• Rotating tripod mounting collar for flexible positioning
• Retractable rubber-armored lens hood for sun/glare protection

The full review

The Celestron Regal M2 100ED spotting scope is built for birders and nature observers who want tack-sharp, color-true images in a rugged field-ready package. At its core is a 100mm objective lens crafted with ED glass, which controls chromatic aberration and delivers crisp, high-contrast views even at long distances or in challenging light such as dawn and dusk when birds are most active. The scope's multi-coated optical elements maximize light transmission, producing bright, natural color rendition that helps distinguish subtle plumage details, an essential feature when identifying warblers, sparrows, or shorebirds that differ only in faint markings. Its rotating tripod collar and dual focus system, featuring both coarse and fine focus knobs, allow quick target acquisition followed by precise fine-tuning, a combination that experienced spotters appreciate when tracking moving subjects like raptors in flight or waterfowl on open water.

Durability is central to the Regal M2's design, with a magnesium alloy chassis wrapped in rubber armoring that shields the internal optics from dust, moisture, and accidental knocks in the field. The scope is both waterproof and fogproof, purged with dry nitrogen to prevent internal condensation, making it dependable during rainy mornings, misty wetlands, or coastal outings where humidity is a constant challenge. Its ergonomic body includes a comfortable grip zone and a smooth-rotating collar, letting users adjust the eyepiece angle for viewing comfort whether observing from a seated blind or standing at a scenic overlook. Compatibility with Celestron's own eyepieces, including zoom options, adds versatility, letting birders switch magnification levels to match different species and distances without needing a separate scope for close versus distant subjects.

Beyond raw optical performance, the Regal M2 100ED is designed with the practical needs of birdwatchers in mind, from its balanced weight distribution for tripod mounting to its compatibility with digiscoping adapters for photographing rare sightings through the scope itself. The wide field of view helps locate fast-moving or camouflaged birds in dense foliage, while the scope's close focus capability makes it equally useful for observing nearby subjects like butterflies or small mammals during quieter moments in the field. Whether used at a backyard feeder station, a coastal shorebird count, or a mountain ridge during migration season, this spotting scope combines precision optics with field-tested durability, giving birdwatchers a reliable tool they can depend on trip after trip.

I've used this scope for shorebird identification and the ED glass really shows—colors are crisp and there's virtually no chromatic aberration even at max zoom.

— Mark T., verified owner