Askar 203 mm f/7 Triplet Apo - EDT Design - 3.5 inch RAP focuser - Optics test with serial number

Askar 203 mm f/7 EDT triplet apochromat with 3.5? RAP focuser

This apo is one of the largest apochromatic refractors on the market and ideal for observatories. Sharpstar also offers uncompromisingly good value for money with this apo. Teleskop-Service tests every APO mechanically and optically before storing it. Only first-class objectives leave our warehouse.

The air-spaced triplet apo objective

The Askar APO series uses special optical designs and multiple elements to correct chromatic aberration, resulting in a higher quality image. ED glass, also known as low dispersion glass, is an optical glass specifically designed to reduce chromatic aberration.

Integrated tube extension for more flexibility

The tube has an integrated extension that can be extended or retracted as required and locked in place with a clamping ring. This allows the AS203APO to be used not only for photography but also for visual observation. The working distance is large enough for the use of a star diagonal mirror and binoviewer.

The 3.5" rack-and-pinion focuser

The Askar Apo is equipped with a stable 3.5-inch rack and pinion focuser with speed reduction, which is compatible with most current focusing motors. The drawtube travel is 100 mm. The entire focuser is CNC-machined and has an anti-reflection coating on the inside. A scale makes it easier to set a specific position. Two finder shoes are included in the scope of delivery.
The large 360° rotator has precise scales for easy adjustment and a large locking screw that is easy to tighten even under heavy loads. Adapters for 2" and 1.25" accessories complete the equipment.
The tube is CNC-machined and finished with a durable paint or anodized.

Teleskop-Service guarantees the optical and mechanical quality through 100% testing

Every single apo is checked in our technical department before being stored to guarantee consistently high product quality.

The mechanics are tested and the focuser is optimally adjusted.

The lens is cosmetically checked and cleaned. We also check that all counter screws are correctly tightened. These often loosen during transportation.

The optics are collimated and the result is checked on the optical bench. The telescope is given a serial number.

A complete optics test is carried out, which is enclosed with the telescope (star images and ronchi image on the optical bench in autocollimation).

Only then are the telescopes handed over to the warehouse and prepared for dispatch.

Technical information

Teleskop-Service has collected a lot of helpful information on refractors and made it available as a PDF file: refractors.pdf

Safety informations: PDF Download