APO110FL F/5.6

Description

Honoring the legacy of TEC’s original compact refractors, the APO110FL F/5.6 marks the return of a fast, portable design ideal for wide-field imaging and visual observation.

The APO110FL features a high-performance oil-spaced apochromatic triplet objective with a central Fluorite (CaF2) element. This optical design delivers exceptional color correction across the spectrum, with multi-layer hydrophobic coatings on the front lens to enhance light transmission and repel moisture and dust.

The objective is mounted in a precision-machined aluminum cell for superior thermal stability. Its lightweight aluminum tube incorporates carefully designed baffles and anti-reflective coatings to maintain high contrast and eliminate stray light.

A newly refined TEC focuser with fine focusing capability on both sides ensures smooth, precise adjustments, ideal for imaging and travel setups alike.

Portable enough for airline travel and offered with optional compact or rugged transport cases, the APO110FL F/5.6 is a modern evolution of TEC’s classic small refractor, streamlined, efficient, and built for serious results.

Each APO110FL F/5.6 includes:

• TEC dual-speed focuser with fine focus on both sides
• Optional full-frame field flattener with diffraction-limited performance
• Versatile mounting options with standard and imaging tube rings
• Two case options for portability and protection
   

Compact and capable, the TEC APO110FL F/5.6 is a no-compromise choice for visual observers and astroimagers who demand performance in a small, travel-friendly form.

Price: $6,400 (including an initial $1,400 refundable deposit).

Note: ALL PRICES AND AVAILABILITY ARE SUBJECT TO CHANGE WITHOUT NOTICE. The price initially quoted for a telescope purchase may not be reflected in the final invoice. Wait times may also be longer than initially quoted. Rest assured that we are working diligently to complete and ship every telescope on order.

How to place an order with TEC

To place an order, please complete the checkout process directly on our site. After your order is submitted, you will receive a confirmation email with next steps for TEC to take your deposit and begin processing. Your order is added to the production list once the deposit is received, but pricing is not guaranteed. The balance is due upon completion. Accessories and mounts can be requested in the order comments. Prices, availability, and lead times may change without notice. Contact us with any questions or concerns.

Specifications

Testing and Quality Assurance

TEC Telescopes go through rigorous testing to ensure top quality performance. Newtonian Rings are used throughout the glass production process and we then use an interferometer to correct any remaining imperfections. Every telescope is then tested vigorously to reach the most optimum Strehl ratio possible. Rest assured that your telescope has been optimized to be as optically perfect as possible. If the objective does not reach Yuri’s expectations, the telescope will not be shipped. As a strict policy, TEC will not release telescope test reports. 

While the objectives are fine-tuned under interferomerical control to meet the highest optical standards, cosmetic imperfections may exist in the objective and the tube assembly. Please rest assured that any imperfection in the telescope has been determined not to affect the optical performance.

Availability

June 2nd, 2025: We currently estimate new APO110FL F/5.6 orders to be delivered by Fall 2025. Only 50 units are planned for this production run.

Optional Accessories for the TEC APO110FL F/5.6

• Field flattener with diffraction-limited performance across full-frame sensors
• Clam-shell tube ring for general use
• Dedicated tube rings for imaging setups
• Airline-portable OTA with two optional carrying cases