TS-Optics 126 mm f/7 Quadruplet Flatfield Apo - with optics test

TS 126 mm f/7 quadruplet apochromat with flat image field up to full frame format

The apo is a versatile telescope for observation and astrophotography. By using two ED glasses in the optical system, the apo offers an image free of chromatic aberration up to the highest magnification range. The generous working distance allows the use of 2" star diagonals and accessories for visual observation. Due to the moderate focal ratio of f/7, the apo is also a large field telescope and a planetary telescope.

However, the apo is just as well suited for astrophotography. The flat image field shows pinpoint stars right up to the edge, even with full-frame sensors. With f/7 you have enough resolution to photograph even small galaxies and planetary nebulae with lots of detail. All necessary tubes and adapters to M48 and 2" filters are already included in the scope of delivery. The optional 0.8x reducer, which is designed for this apo, improves the focal ratio from f/7 to f/5.6 and considerably shortens the exposure times.

The most important features of the 126 mm f/7 apo:

The corrector is permanently installed in the tube; as soon as you have focused the camera, you are automatically at the correct distance for optimal field correction.

The 3.2" focuser is optimized for astrophotography and, in addition to 2" and 1.25" connections, also offers M63x1, M54x0.75 and M48x0.75 connections for screw adaptations.

A precise 360° rotation and a reduction for exact focusing are included.

A retractable dew shield shortens the transport length and even makes the apo suitable for hand luggage on airplanes.

The apo impresses with very high-quality mechanical workmanship, such as CNC rings and a versatile carrying handle, which is also suitable for connecting guide scopes.

Each 126 mm quadruplet apo is visually and mechanically checked by Teleskop-Service before shipping.

Comprehensive adapters for observation and astrophotography included:

Adapters for observation
- Adapter from M70x1f to M63x1f
- Adapter from M63x1f to 2" receptacle
- Adapter from 2" receptacle to 1.25" receptacle (all three already assembled)

Adapters for photography (these can also be used with the optional reducer)
- M63x1 extension, 36.5 mm long
- Adapter M63x1m to M54x0.75m
- Adapter M54x0.75f to M48x0.75m, 16.5 mm optical length

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

Every individual 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 objective 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 included 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 in English as a PDF file: refractors.pdf

Customer photo and review (translated)

Our customer Alexander K. has taken a fantastic photo with this telescope, and we would like to share it with you:

Object: Messier 106 (as well as NGC 4217, NGC 4248, and many others)

Photographer: Alexander K. (Germany)
Location: Dark skies near Weingarten/Ravensburg (Bortle 4)
Date: April 7, 2026
Imaging telescope: TS-Optics TSAPO126PHQ (TSAPO126PHQ)
Filter: None
Imaging camera: ZWO ASI2600MC Pro (ASI2600MC-P)
Mount: Sky-Watcher EQ6-R with column extension (EQ6-R with EXEQ6w)
Exposure time: 105 × 120 s

There is also a review of the telescope by Alexander K.:

"Here´s a quick review of the apo (5 stars):

I use the telescope for photography with an ASI2600MC Pro (APS-C).
The whole setup is mounted on an EQ6-R mount with a column extension. Without the extension, it would be a bit too close and a collision with the tripod would be inevitable.
The imaging performance is outstanding, and the stars are beautifully round all the way to the edges, just as they should be.
Unfortunately, I haven´t been able to test the reducer yet.
The mechanical build quality is very high. Both the sturdy focuser and the dew shield are very solidly constructed and operate smoothly and effortlessly.
I was able to mount my guidescope on the handle and an ASIAir Plus on the already-mounted finder shoe.
Since this is a flat-field apochromatic telescope, there´s no need for tedious focus ring adjustments.

My conclusion: Great value for the price. Highly recommended!"

We would like to thank our customer for the great photo and the report.

Instructions for adapting the ZWO EAF to the focuser

The instructions language is German and English ... eaf-tsapo-phq.pdf

Safety informations: PDF Download