Teleskop Service Thin Off-Axis Guider - M48/T2

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Teleskop Service Thin Off-Axis Guider - M48/T2

Teleskop Service Thin Off Axis Guider - M48/T2

The TS Off Axis Guider has only a 9mm optical length - the shortest OAG by TS. It's ideal for all telescopes with short back focus or for flattener / corrector combinations. It works with large aperture - suitable even for 35mm sensors and very versatile

Guiding using an off-axis-guider has many advantages. You do not need a guiding scope (= less load for the mount) and guiding accuracy increases because threre's no flexure between main- and guiding scope. Addtional errors like mirror shifts are corrected, too.

Main charecteristics of the TSOAG9:

  • extremely short back focus: only 9 mm from the 2" barrel to the T2 thread on the camera side
  • large free aperture (45 mm). Even bigger camera sensors can be used without vignetting
  • very versatile due to a wide variety of adaptation options on both sides
  • off-axis port can be focused independently from the main camera
  • the prism's position can be shifted - for a wider field to find guiding stars

The short design TSOAG9:

Our TSOAG9 is very short. So it can be used even with short back-focus systems. It can be combined with correctors, too: The corrected star image will be used for guiding and the guiding accuracy is increased accordingly.

Technical details of the TSOAG9:

  • optical length with 2" telescope receptacle: 9mm (2" nosepiece TSVF230 needed aditionally)
  • optical length with M48 telescope receptacle: 11.2mm
  • telescope side: very short 2" nosepiece and M48 x 0.75 fem. thread
  • camera side: T2 (M42x0.75) male thread (adapter rotatable by 3x 120)
  • free aperture: 45mm
  • distance prism to T2 guiding port: 26mm - 38mm
  • distance prism to OAG front side: 6.7mm
  • distance prism to OAG back side: 4.5mm

Adapting the TSOAG9 to your telescope:

One of the OAG9's big advantages is its wide range of adaptation options. You can attach it to nearly any telescope system:

  • Adaptation to 2": Adapter TSVF230
  • Adaptation to M48: included in standard delivery
  • Adaptation to T2: BA2458110
  • Adaptation to SC thread: TSSC-M48
  • Adaptation to TeleVue Paracorr: TSTV-M48A
  • Adaptation to Vixen Reducer for VMC and VC Cassegrains: TSViRed-M48

Adapting the TSOAG 9 to your camera:

  • Adaptation to T2 (M42x0.75): included
  • Adaptation to M48: TSOAG9-M48
  • Adaptation to M42x1: TSOAG8-M42

With a short addtional T2 adapter, you can rotate your camera: TST2WE

The guiding port with its T2 thread allows attaching all common auto guiders. They can be focused by moving the T2 connector.

  • T2: included in standard delivery
  • Adaptation to 1": TST2-1-T2s
  • Adaptation to C-Mount: T2-Cs

Recommended auto guiders:

Because of its extremely short design, the OAG9 cannot be rotated freely (3 positions in 120 steps are possible). Therefore the range of suitable guiding stars is a little bit limited. So you need a sensitive autoguider. These auto guiders have been tested by us successfully:

  • Starlight Xpress LODESTAR
  • Moravian G0-0300
  • Lacerta M-Gen (Stand Alone - no computer needed)

Teleskop Service Product Number: TSOAG92T


ManufacturerTeleskop Service


Ask a Question
  • Can I connect a SBIG ST-I or an Orion Autoguider camara to the guider side? how?

    Good day and thanks for asking. To use this OAG with 1.25" diameter cameras you will need to also use the Baader BA-EYEHOLD-2. That will secure the camera to the OAG.

  • Sirs. Are the Eyepieces Standard meassurs , in diameter, to be use in All telescopes ?

    This is a 1.25" diameter eyepiece, which is the industry standard for all modern telescopes. Thank you, Sean

  • Hi I have an sbig st-I guide camera and an Orion autoguider, any of them can be connected in this off axis? What do I need to buy

    The Orion Starshoot guider with the T2 connection will work, but the ST-i or any other 1.25" format guide camera will need a T2 to 1.25" nosepiece adapter like the BA-EYEHOLD or BA-EYEHOLD-2 to connect to this OAG.

  • My configuration is TV-76 refractor plus TV .8x reducer to QSI 683-ws (35.56 backfocus). TV needs 56mm backfocus +/- 4mm so I believe I'll need a 10mm extension tube? My autoguider is SX-Lodestar - but I have an Edmunds Optics T-thread to CS-mount adapter

    You will want that 10mm spacer and then a Baader or TS M48 male to T2 step down adapter to attach to OAG to the focal reducer. This should get you to ~58mm spacing. The OAG guide part is designed for 15mm back focus from T2 with 46.5mm to the main camer

  • I have two telescopes: a Stellarvue SV105T refractor (f/7, 735mm f .l.) and a Meade SN110 Schmidt Newtonian (f/4,1016mm f.l.). I also have a Starlight Express Lodestar autoguide camera and plan to do astro imaging with my Nikon D5300. The SV105T has the

    Unfortunately, this OAG is not natively compatible with the Lodestar (an additional adapter will be needed) and it will not work with an MPCC and any DSLR but a Canon using the Teleskop-Service Ultra Thin T-ring. If you use a standard Nikon T ring, the c

  • What would be needed to use this with a Televue 85>0.8X FR/FF>Canon DSLR?  Is it possible to configure for that setup? Thank you

    This particular version of the TSOAG9 will not work for your purpose unless you get the optional thin T2 EOS adapter. A better bet would be to get the TS-TSOAG9EOS for $319 (which comes with the correct adapter for a Canon DSLR) and then get a $18.95 TS-T