New: TS-Optics 110 mm f/6 Apo - Carbon Tube - 2.7" RAP Focuser - Tube Rings - with Optics Test

TS 110 mm F6 f660 mm APO Doublet Refractor

With its fast focal ratio of f/6, the apo is faster than simple EDs, which are usually f/7 to f/9. In order to still achieve good chromatic correction, the ED special glass was supplemented by another special glass (lanthanum glass). This achieves a correction equivalent to a normal f/7 to f/8 ED refractor. The high speed also offers advantages for astrophotography, an object can be exposed in just one night. Suitable correctors can be found in the accessories section.

Astrophotographic results obtained with this telescope on Astrobin
Here you can find some astrophotographs made with this telescope model: Link to Astrobin

All lens surfaces are coated with a multi-coating for maximum light transmission. Baffles inside the optical tube and in the focuser prevent reflections and ensure sharp, high-contrast images.

The TS 110 mm Apo has a high-quality 2.7" rack and pinion focuser with ball bearings. This guarantees sensitive and accurate focusing even with heavy accessories. The focuser accepts 2" and 1.25" accessories. You can also use 2" diagonals and common correctors.

The comprehensive features are complemented by sturdy CNC tube rings and a sturdy transport and storage case.

The Apo is equipped with a carbon tube:

A carbon tube not only saves considerable weight, it is also very stiff and resistant. When the telescope has cooled down, it needs to be refocused less often, because carbon does not react as extremely to temperature fluctuations as metal. Stars become sharper because the focus position is held better in astrophotography.

Astrophotography with the TS 110 mm f/6 Apo

The fast apochromat is very well suited for astrophotography. The robust 2.7" RAP focuser supports even heavy cameras, offers 360° rotation and has dual speed for precise focusing. We highly recommend the following correctors:

TSFLAT25G2 - 1.0x Full Frame Format Corrector
The professional corrector is designed for full frame format. For connection to the apo, the M74-TSFLAT25 (M68x1 adapter) transition adapter is required. This allows you to screw the corrector directly to the focuser.

For the correct working distance (55 mm from the M48 thread) you still need a 5 mm M68x1 extension tube # TSVM685.

TSRED379 - 0.79x focal length reduction
To all astrophotographers for whom f/6 is not fast enough, we offer a focal length reduction with field correction. The focal ratio improves to f/4.74. For the connection to the apo you need the transition adapter M74-TSFLAT25. This allows you to screw the corrector directly to the focuser.

To achieve the correct working distance of 55 mm from the M48 thread, you still need 2x M48 tuning rings with 1 mm thickness # M48abstimmring1.

This is how we hand over the apo to the amateur:

Every single apo is checked in our technical department before it is put into storage, in order to guarantee a 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.

An optical 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 about refractors and provided it in English as a PDF file: refractors.pdf

Safety informations: PDF Download