Double Slider T-thread
The Double Slider from Gerd Neumann jr works similarly to the Guiding Excenter and addresses an issue that astro photographers face quite frequently. There are various ways of adjusting the direction of the guide telescope. A special guide scope mount (e.g. guide scope mount from Skywatcher or Stronghold Assembly from Baader) is being one and the use of guidescope tube rings is the other, however both of these techniques will have more or less problem with flexure between the imaging and guiding scope, depending on the weight of the guiding scope and precision/load capacity of the mount.
The Guiding Excenter however does it differently. Instead of moving the guidescope tube, it simply moves the guide camera. You can imagine how big movement would be needed on a guidescope mount or the tube rings to achieve the corresponding movement of the camera. So, it is much quicker and easier to use. Also, it practically fully eliminates the above issue with flexure between the guide scope and imaging scope.
In addition to the features of the Guiding Excenter, the Duble Slider also adds the convenience that you may have a guide camera in one holder and an eyepiece in the other, that can be extremely helpful especially when you use a telescope with very long focal length for imaging tiny objects, like planets where centering the object through the camera might be very tricky, but can be easily done through a wide-field, long focal length eyepiece...
Similarly to the Guiding Excenter, the eyepiece holders can be removed and with a help of an optional adapter M36,4 / T-2 (T2 for Vixen/Takahashi telescopes) your guide camera can be mounted via this sturdy connection.TELESCOPE CONNECTION: VIA T-THREAD
For full description of the product please visit the manufacturer's website.
Telescope side connector: T-thread (M42x0.75)
(Adapter/converter to 2" nosepiece is available separately, click here!)
Optical path: 43mm (full length)
Optical path: 15mm (when eyepiece holder unscrewed)
Gerd Neumann jr is also the manufacturer of the famous, high quality Astronomik telescope filters.
Image is for demonstration purposes only. Above mentioned M36.4/T2 adapter is not included, but available separately.