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Imaging Star 100 mm f/5.8 Quadruplet Apo with field flatener TSQ100 - TSOPTICS


The TSQ-100ED apochromat for astrophotography offers a gigantic fully corrected and illuminated image field.

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  • 100 mm aperture / 580 mm focal length / focal ratio f/5.8
  • 4-element design similar to Petzval - all four elements are built into the tube at fixed positions.
  • 49 mm image circle with full illumination and correction allows using full-frame size cameras
  • 4" CNC rack and pinion focuser with 360° rotation and an adjustment range of 40 mm
  • Working distances 95-135 mm from the M82x1 male connection thread or 62-102 mm from the 2" receptacle - depending on the position of the drawtube of the focuser.
  • Tilting unit included
  • Each quadruplet apochromat is checked before shipping and the optical system is tested - you get an optimally adjusted telescope for successful photography and observing right from the beginning.
  • Numerous photographic results can be found in the internet and also here in the reviews section.uverture 100 mm / distance focale 580 mm / rapport focal f / 5,8

TSQ-100ED Quadruplet Apo with permanently built-in field correction

The 100 mm f/5.8 quadruplet of the TS Imaging Star line is highly appreciated by astrophotographers. The telescope is an interesting alternative to the Takahashi FSQ-106ED. Due to the air-spaced FPL53 objective, the image is free from chromatic aberration and provides outstanding contrast. Through the integrated corrector the field is perfectly flattened. You will get perfect stars in the field right from the beginning, without the exhausting search for correctors and the right distance.

Despite the apo was optimized for astrophotography, it will offer very good performance also visually. The stars are pinpoint and are imaged without chromatic correction. The image stays sharp and contrasty up to 300x magnification.

The photographic 4" rack&pinion focuser:

The CNC focuser is optimized for photography and can handle a payload of up to 8 kg. The travel of the drawtube is carried out via rack and pinion. The construction of the focuser is similar to the Starlight Feather Touch and the mechanical stability comes very close to that of the Starlight Feather Touch. In addition to 2" and 1.25" receptacles, an M78x1 thread is also available for screw adaptations. Suitable adapters, e.g. for the M68x1 thread, are of course available.

Features and advantages:

♦ Excellent FPL53 triplet objective (glass from Ohara, Japan)
♦ Integrated flattener with factory-set optimized distance to the objective for optimal sharpness in the field
♦ 4" CNC rack and pinion focuser with male M82x1 connection thread - payload up to 6 kg
♦ The system is free from annoying reflections
♦ Objective and corrector are adjustable - but are already delivered optimally adjusted
♦ Each quadruplet apo is checked before shipping and the optical system is tested

A first-class apochromat for astrophotography:

Our goal was achieving imaging quality on the axis AND in the field without compromises, and also without additional flattener or correctors. The corrector has to be built-in permanently and, obviously, in the optimal distance to the objective. This is almost unobtainable by using an optional flattener. Furthermore, the apochromat has to be mechanically solid and easily to adjust. This has been made possible with the flatfield apo.

The focuser has to be stable and, in particular, designed for heavy cameras. With the rack and pinion drive, even heavy accessories can be used. Locking is safely achieved by blocking the adjustment unit.

Connection of cameras with a flange focal distance of 55 mm

The easy way is via the 2" connection. With the TSFA240 adapter you get a T2 connector and with the TSVF230 adapter you get an M48 connector for cameras with larger sensors. You can focus without any problems.

Many amateurs prefer a screw mount. The apo offers a M82x1 male thread for this. We recommend the following adaption for a comfortable focus position. With the adaption you do not go too early on the M48 thread and avoid shadowing with large sensors.

♦ M82i-M68a - length 10 mm
♦ TSVM6840 - M68 extension - length 40 mm
♦ M68i-M48a - length 5 mm

Visual observation through the apo:

The 100 mm Quadruplet is optimized for astrophotography. However, it will also give very good results for visual observation and allows magnifications up to about 250x with good contrast imaging. The tight focus position only allows the use of 1.25" accessories. For a 2" mirror diagonal the focus distance is too short.

This is how we hand over the apo to the star lover:

Every single TSAPO100Q 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, the focuser is adjusted optimally.
♦ The objective is cosmetically checked and cleaned. In addition, it is checked whether all counter screws are correctly tightened. Often these loosen during transport.
♦ The optics are collimated and the result is checked on the optical bench.
♦ Only then are the telescopes transferred to the warehouse and prepared for shipment.


  • Aperture:    100 mm
  • Focal length:    580 mm
  • Focal ratio:    f/5.8
  • Objective:    Air-spaced triplet objective
  • Field corrector:    Single lens field corrector system
  • Corrected and fully illuminated field:    49 mm
  • Back Focus from 2" connection:    102 mm - inner draw tube position
  • Drawtube travel:    40 mm
  • Clear aperture:    90 mm with anti-reflex thread
  • Connections on the eyepiece side:    M82x1 male thread and 2" and 1,25" connection
  • Connections on tilter:    M82x1 male/female
  • Distance from M82x1 thread to 2" connection:    33.5 mm including tilter
  • Fine focusing:    1/10 micro transmission
  • Maximum photographic load:    6 kg
  • Tube:    painted ultra black inside - length 490 mm (19.25") with retracted dew shield
  • Dew shield diameter:    140 mm
  • Weight:    only 5.3 kg (10.8 pounds)
  • Weight of the case:    3.5 kg (7.7 pounds)
  • Size of the case:    615 mm x 260 mm x 220 mm

In The Box

  • 100 mm f/5.8 quadruplet flatfield apochromat
  • 4" rack-and-pinion focuser with finder shoe
  • CNC rings
  • Transport case
Product Details

Data sheet

Filetage M82
Oculaires inlus
Poids (Kg)
Pleine illumination

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Imaging Star 100 mm f/5.8 Quadruplet Apo with field flatener TSQ100 - TSOPTICS

The TSQ-100ED apochromat for astrophotography offers a gigantic fully corrected and illuminated image field.

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