Explore Scientific 127mm f/7.5 Classic White FCD100 ED Triplet Refractor

Description

Explore Scientific 127mm f/7.5 Classic White FCD100 ED Triplet Apochromatic Refractor

The Explore Scientific 127mm f/7.5 Classic White FCD100 Triplet apochromatic refractor brings the same high-performance optics found in the carbon fiber version of this scopebut in a more traditional, all-metal optical tube. Built around precision air-spaced ED triplet optics and housed in a durable aluminum tube assembly with a retractable dew shield, this scope offers true apochromatic performance, rugged construction, and an impressive value for observers and astrophotographers alike.

If you’re looking for a telescope with excellent color correction, excellent sharpness, and mechanical features that make it equally at home for deep-sky imaging or planetary observation, the 127mm FCD100 Classic White refractor delivers in every category.

Premium ED Optics That Rival the Best

This 127mm (5″) triplet objective uses Hoya FCD100 extra-low dispersion glass, the equivalent of Oharas famed FPL-53. As the core element in a three-lens air-spaced optical system, FCD100 provides extraordinary chromatic aberration control, resulting in views and images that are essentially free from color fringingeven at high magnifications or during long-exposure imaging.

Bright stars, the lunar limb, and planets show pinpoint structure and natural color, while deep-sky objects like open clusters and nebulae appear against rich, dark backgrounds. The fully multicoated optics use Explore Scientific’s proprietary EMD coatings on every air-to-glass surface, boosting transmission, reducing scatter, and preserving contrast.

Whether youre observing visually or using a dedicated astro camera, the optical quality is clean, precise, and deeply satisfying.

A Proven Size for Performance and Portability

With its 952mm focal length and f/7.5 focal ratio, the ES127 FCD100 is a versatile scope that balances resolution, light grasp, and manageable size. The 5″ aperture gathers 55% more light than a 102mm refractor and offers increased resolving power for subtle planetary detail and finer image scale.

Yet at just over 20 lbs with rings, it’s still light enough to mount on a medium-duty equatorial setup and portable enough to be loaded into the car for a weekend under dark skies.

Rugged All-Metal Construction

This version of the ES127 FCD100 features a traditional aluminum optical tube assembly (OTA) finished in Explore Scientifics iconic classic white enamel. The body and retractable dew shield are built to withstand years of field use without flexing, warping, or cosmetic degradation.

For imagers, the stable tube construction means you can confidently attach cameras, filter wheels, and field flatteners without worrying about tilt or sag. And for visual observers, it brings peace of mind knowing that focus and collimation will remain solid over time.

Dual-Speed 2.5″ Rotating Hexagonal Focuser

The oversized 2.5″ hexagonal focuser delivers smooth, backlash-free motion with a built-in 10:1 reduction for precise fine focusing. Designed to support heavier accessories, the focuser features tension and lock adjustments, graduated drawtube markings, and a rotating base that makes camera or diagonal framing easy.

• Large ribbed knobs for secure grip

• Microfine control knob for imaging and planetary work

• Locking system to hold focus during long exposures

• 2″ compression ring accessory holder

• Includes two 2″ extension tubes for optimal back focus

Designed for the Field and the Future

Explore Scientific built this scope to be a lifetime companion. It comes with dual split mounting rings and a Vixen-style dovetail plate for quick attachment to a wide range of mounts. The top stabilizer bar doubles as a carry handle, making setup and teardown easier and more secure.

Additional thoughtful features include:

• Retractable dew shield to block stray light and minimize dew

• Blackened interior and internal baffles to preserve contrast

• Collimatable lens cell with access via the dew shield for alignment if needed

• Slip-on metal dust cap

• Pre-installed finder base ready for your preferred aiming device

A Visual and Imaging Workhorse

Whether used for high-magnification visual observations of the planets or wide-field astroimaging with a field flattener or reducer, the ES127 FCD100 Classic White refractor is a telescope that grows with you. Its equally comfortable on a backyard pier as it is at a dark-sky star partyand delivers the kind of satisfaction only a high-quality refractor can.

Warranty and Registration

Each ES127 Classic White triplet is individually serial numbered and comes with a limited one-year warranty. When registered within 60 days, that coverage extends to Explore Scientifics Lifetime Transferable Warrantya rare and welcome feature that adds long-term value and peace of mind for you or a future owner.

Specifications

• Optical design: Air-spaced triplet apochromatic refractor

• Aperture: 127mm (5″)

• Focal length: 952mm

• Focal ratio: f/7.5

• Glass type: Hoya FCD100 ED glass (FPL-53 equivalent)

• Tube construction: Aluminum with retractable dew shield

• Focuser: 2.5″ rotating dual-speed hexagonal focuser (10:1 micro)

• Drawtube: Graduated with lock and tension knobs

• Back focus: Two 2″ extension tubes included

• Mounting rings: Dual rings with Vixen-style dovetail and carry handle

• Finderscope base: Installed

• Dust cap: Slip-on metal

• Weight: ~21 lbs with rings and dovetail

Tech Details:

Aperture	5″
Binary and Star Cluster Observation	Very Good
Focal Length	952mm
Focal Ratio	f/7.5
Galaxy and Nebula Observation	Good
Highest Useful Magnification	271x
Lunar Observation	Great
Weight	22 lbs.
Planetary Observation	Very Good
Resolution	0.91 arc seconds
Telescope Type	Refractor
Visual Limiting Magnitude	13
Warranty	1 year, extendable to lifetime

Supplied Accessories:

• Dual tube rings with Vixen-style dovetail
• 2.5″ dual speed Hexagonal focuser
• Retractable dew shield
• Dust covers
• Finderscope base
• 99% reflective 2″ diagonal