Baader 1.25" Filter Holder for T-2 and 2" Filter Thread Accessories
If regularly happens that a 1.25″ filter or another part (Barlow lenses, reducers) with a 1¼” filter thread has to be mounted in the path of light of a larger diameter optical or imaging accessory. This is the purpose of this filter holder package.
The holder accessory package consists of four separate components:
- Baader T-2 Conversion Ring (#2958110)
- Baader Double T-Filterholder 1¼” (#1508030)
- T-2 Fine-Adjustment ring 1mm (gold) – Aluminium (#2457913)
- Baader Expanding Ring T-2f / M48m (T-2 part #29) (#2458110)
The Double T-Filterholder accepts common 1¼” filters, as well as, for example, the Q-Barlow lens (please note that this Barlow can only be screwed in about a quarter turn due to technical production characteristics).
When combined with the T-2 Conversion Ring #2958110, you get a filter holder that can be screwed between any two T-2 part and has an overall length of 10 mm. In combination with parts with 3 mm long T-2-threads, it sits flush; for parts with 5 mm long threads, a T-2 Fine-Adjustment ring 1mm (gold) – Aluminium #2457913 is also included so that all components sit flush against each other. This allows 1.25″ filters or Barlow lenses/reducers with standard 1¼” filter threads to be permanently inserted even in front of accessories that are screwed to the telescope via T-2 threads to prevent them from tilting – be it heavy eyepieces, cameras with filter wheels or an ADC. By installing the filter holder facing one side or the other to the telescope, the distance from filter/barlow to camera/eyepiece can also be changed a little bit.
With the Expanding Ring T-2f / M48m #2458110, the adapter can also be used in any 2″ filter thread. Although this leads to vignetting on long focal length wide-angle eyepieces, it allows, for example, the use of a 1.25″ filter (or a Blaze grating) on 2″ eyepieces or on cameras with a fixed 2″ filter thread (and a sufficiently small sensor) on which the Baader 1¼” / T-2 plug-in connection with Safety Kerfs # 2458106 cannot be used or if a screw connection to the telescope is preferred.
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