TS Optics 2" / T2 Flip Mirror and Off Axis Guiding System - with 360° rotation

One of the most versatile solutions for multiple connections - for observations and imaging - with free adjustable large side viewing port -

It has been broken new ground and developed a completely new alternative to classical Flip Mirror Systems. Not only the short design but also the versatile use convinces.

Fields of use - Flip Mirror

Here, no mirror is flipped but a large prism is placed onto the optical axis for 90° viewing position. In straight-through mode, the prism is pulled outward an gives the optical path free. Centre the object with the 90° viewing position, pull out the prism and capture the now centred object with your camera or observe it with a high-power eyepiece.

Fields of use - Off Axis Guider

The prism is placed at the rim of the optical field. Now the autoguider can "see" stars outside the camera´s field of view. This application is recommended for sensors up to approx. 30 mm diameter (APS-C). The flip mirror is rotatable by 360° making finding a guide star easy.

The TSFLIP is suitable for the following telescopes:

As it only needs 35.5 mm back focus, its compatibility is by far higher than conventional flip mirror systems.

• Refractor Telescopes
• Schmidt Cassegrains
• RC and MAK telescopes
• Newtonians with enough back focus

Necessary back focus for visual observation or photography with CCD cams / web cams: 75 mm

The necessary back focus is calculated by the back focus of the TSFLIP itself and the length of the sideward viewing terminal. This is true for both modi (Flip Mirror or Off Axis Guider).

Necessary back focus for photography with DSLR cameras: min. 82 mm

The necessary back focus is calculated by the optical length of the TSFLIP and the back focus of the DSLR camera (35.5 mm + min. 46 mm for the DSLR camera). With a classical T2 adapter, 10 mm have to be added. But you can get a very thin adapter.

How can I measure the back focus of my telescope?

Back focus means the "spare travel" of your focuser. Just place a standard eyepiece (without diagonal etc.) in your focuser and focus a celestial object (or one that´s at least 1 km away). Then, measure the way the focuser could travel inside. That´s your back focus.

That´s how the TSFLIP works

A multi-coated prism guide the light by 90° out of the system. When inserted, the prism sits exactly in the middle of the optical path. So you see exactly the same object in the middle as the camera does after the prism has been pulled outside. So it´s easy to centre an object for your camera or high-power eyepiece.

If the prism is pulled out partially, it can still collect off-axis light rays to be used for guiding. So you also have a fully functional Off-Axis Guider.

Focusing the sideward terminal

First, focus the camera or eyepiece that sits in the straight-through position. Then (without touching the telescopes focuser) focus the 90° eyepiece or camera by loosening the top screw beneath the T2 thread and slide the adapter up tor down. Then, tighten the screw again. Now both eyepieces / cameras are in focus.

TSFLIP connection thread

Thanks to the popular standard threads, the TSPLIP can be connected to nearly all telescopes:

• Telescope side: female M48x0.75 mm (2" filter thread) - 360° rotatable
• Camera side: male T2 (M42x0.75 mm) - 360° rotatable
• 90° terminal: male T2 (M42x0.75 mm)

For the appropriate adaption at your telescope please ask us!


Delivery contents

• TSFLIP Flip Mirror