Explore Scientific ED APO 127mm f/7.5 FCD-100 Alu HEX

Explore Scientific ED APO 127mm f/7.5 FCD-100 Alu HEX

Description

The Explore Scientific ED APO 127mm f/7.5 FCD-100 Alu HEX is a premium air-spaced triplet apochromatic refractor featuring HOYA FCD-100 extra-low dispersion glass. Designed for advanced users, this telescope offers exceptional optical performance, combining excellent chromatic correction, mechanical reliability, and versatile use for both imaging and high-magnification visual observation.

With a focal length of 952 mm and a 127 mm aperture, this f/7.5 refractor ensures a high level of brightness, sharpness, and contrast. Its triplet lens system, with central FCD-100 element and two air spacings, achieves a polystrehl index over 0.97, minimizing chromatic aberration across the field and making it suitable even for demanding astrophotographic applications.

The lightweight but rigid aluminum optical tube is equipped with a retractable dew shield, easing storage and transport. The precision 2.5" HEXAFOC rack-and-pinion focuser, with 1:10 micro-reduction, allows smooth and accurate focusing, particularly useful when working with large imaging sensors without risking vignetting.

This telescope belongs to Explore Scientific’s "Professional Line", distinguished by high-quality optical glass (FCD-100), enhanced mechanical parts, and excellent overall performance. It is delivered with a 2" diagonal mirror (99% reflectivity), two extension tubes for the focuser, a universal 44 mm dovetail plate with stainless steel reinforcement, and a hybrid finder shoe compatible with most finder brackets.

The Explore Scientific 127mm f/7.5 FCD-100 refractor is a top-tier instrument for demanding visual astronomers and astrophotographers seeking sharp, high-contrast images and precise mechanical control.

Technical specifications

• Optical design: Apochromatic refractor (triplet)

• Lens configuration: Air-spaced triplet with central HOYA FCD-100 element

• Aperture: 127 mm

• Focal length: 952 mm

• Focal ratio: f/7.5

• Theoretical resolution: 1.08 arcsec

• Maximum useful magnification: 260x

• Back focus: 150 mm from drawtube

• Focuser: 2.5" HEXAFOC rack-and-pinion with 1:10 micro-focuser

• Clear aperture of focuser: 65 mm (no vignetting with large format sensors)

• Optical coating: Enhanced Multilayer Deposition (EMD)

• Tube material: Aluminum

• Tube length: 800 mm

• Tube diameter: 180 mm

• Retractable dew shield: Yes

• Net weight (with accessories): 7.7 kg

Included items

• Explore Scientific ED APO 127mm f/7.5 optical tube

• 2" diagonal mirror with 99% reflectivity

• Two extension tubes for focuser

• Tube rings with carry handle

• 44 mm universal dovetail with stainless steel reinforcement

• Retractable dew shield

• Dust caps for lens and focuser

• Hybrid finder shoe (compatible with multiple finder types)