TS Optics Apochromatic refractor AP 155/1240 CD-APO Deluxe OTA (70610)

The TS Optics Apochromatic Refractor AP 155/1240 CD-APO Deluxe OTA is a top-tier refracting telescope designed for advanced astronomers and observatories. With a large 155mm aperture, it delivers exceptional brightness and detail, making it ideal for deep-sky and planetary observation as well as astrophotography. The FPL55 triplet lens, combined with Lanthanum special glass, ensures precise color correction and sharp images without color fringing. Every glass-to-air surface is fully multi-coated for maximum light transmission, and internal screens help prevent scattered light for clearer views.

The telescope features a robust 3.7-inch rack and pinion focuser, optimized for photography and capable of supporting loads up to 8 kg—perfect for heavy cameras and accessories. The focuser has multiple internal threads for direct screw-on adapters, especially flatteners, and can rotate 360° for perfect framing. Despite its large aperture, the telescope remains relatively lightweight and can be mounted on popular mounts like the Skywatcher EQ-6 or iOptron GEM45.

Each telescope comes with a manufacturer’s test certificate, a unique serial number, and is thoroughly tested and collimated before delivery. The package includes the 155mm apochromat, Losmandy-style dovetail rails, a test certificate, and a carry case.

Optical Specifications

• Type: Refractor (Apochromat)

• Lens design: Triplet (FPL55 + Lanthanum)

• Aperture: 155 mm

• Focal length: 1240 mm

• Aperture ratio: f/8

• Resolving capacity: 0.89 arcseconds

• Limiting magnitude: 12.8

• Light gathering capacity: 490 times the human eye

• Maximum useful magnification: 310x

• Tube weight: 13 kg

• Tube diameter: 156 mm

• Carrying length: 1145 mm

• Coating: Fully multi-coated (FMC)

• Stray light baffles: Yes

• Dew cap diameter: 186 mm

Focuser Features

• Type: Rack and pinion

• Eyepiece connection: 2"

• Camera-side threads: M92, M63

• Backfocus: 140 mm

• Free aperture: 94 mm

• Motorized: No

• Ring clamp: Yes

• Load capacity: 8 kg

• Gear reduction: Yes

• Adjustment range: 100 mm

• Rotating: Yes (360°)

Mount and Accessories

• Mounting: Optical Tube Assembly (OTA, no mount included)

• Dew shield: Yes

• Corrector: Not included

• Prism rail: Losmandy-style

• Carrying handle: Yes

• Transport case: Yes

• Finder base: Vixen/Skywatcher compatible

• Eyepiece adapter: 2" / 1.25"

• Tube clamps: Yes

• Test protocol: Included

Application Areas

• Astrophotography: Yes (very good)

• Moon & planets: Yes

• Nature observation: No

• Nebulae & galaxies: Yes

• Sun: No (only with appropriate solar filter)

Recommended For

• Beginners: No

• Advanced users: Yes

• Observatories: Yes

This telescope is an excellent choice for those seeking a powerful, reliable, and optically advanced instrument for both high-end imaging and visual observation.