Explore Scientific Apochromatic refractor AP 102/714 FCD-1-ED Alu OTA (44837)

This apochromatic refractor offers everything an astrophotographer could desire—at an affordable price.

Its three-element optical design, crafted from high-quality FCD-1 ED glass by Hoya (Japan) and featuring two air gaps, delivers a corrector that surpasses the performance of typical two-element ED apochromats in this price range. With a polystrehl value exceeding 0.9, it provides significantly sharper images compared to the 0.8 achievable with two-lens systems. This exceptional optical performance, paired with a robust mechanical build, ensures an instrument that meets all expectations.

For astrophotography enthusiasts, an optional field flattener accessory is available, allowing unrestricted use for imaging purposes. Additionally, the tube length has been optimized to accommodate accessories requiring precise focal positions.

Specifications

Optics

• Type: Refractor

• Build: Apochromat

• Aperture: 102 mm

• Focal Length: 714 mm

• Focal Ratio: f/7

• Resolving Capacity: 1.13 arcseconds

• Limit Magnitude: 11.8

• Light Gathering Power: 210x (compared to the human eye)

• Maximum Useful Magnification: 204x

Tube Characteristics

• Weight: 4.9 kg

• Material: Aluminium

• Coating: EMD

• Construction: Full tube

• Tube Diameter: 104 mm

• Dew Cap Diameter: 154 mm

• Carrying Length: 560 mm

• Tube Length: 630 mm

Lens Design

• Type: Triplet

• Glass Material: HOYA FCD-1

Focuser

• Build Type: Rack and pinion

• Eyepiece Connection Size: 2 inches

• Gear Reduction: 1:10 fine focusing capability

• Backfocus Distance: 165 mm

• Rotatable Focuser: Yes

Mount

• Type of Build: OTA (Optical Tube Assembly)

• Mounting Type: None included (requires separate mount)

• GoTo Control: Not included

Included Accessories

• Prism Rail: Vixen-style rail for mounting

• Tube Clamps: Yes

• Transport Cases: Not included

• Carrying Handle: Yes

• Dew Shield: Yes

Deviating Optics

• Star Diagonal: 2-inch, 90° diagonal included

Finder Scope and Base

• Finder Scope: Not included

• Finder Base: Meade/Explore Scientific T-profile

Extension Tubes: Yes

General Information

• Series: Essential Line

Areas of Application

• Moon & Planets: Suitable for observation and imaging.

• Nebulae & Galaxies: Suitable for deep-sky imaging.

• Nature Observation: Suitable for terrestrial use.

• Astrophotography: Fully compatible with imaging setups.

• Sun Observation: Not suitable unless paired with an appropriate solar filter.

Recommended For

• Beginners: No (not ideal for first-time users).

• Advanced Users: Yes (perfect for experienced amateurs).

• Observatories: No (not designed for professional observatory use).