BORG M75 Helical Focuser

M75 helical focuser has 30mm focus travel. It should be long enough to focus from the infinity to some terrestrial distance target without drawtube.

P3720249s1It turns a super telephoto lens for astro and wildlife photography. I will switch a current focuser with M75 one. Front focuser configuration should make the overall weight balance better and, allow for easier and smoother focusing even a heavy cooled 6D is set at the back end.


Part # 7875 : $560.00

Features :

  • 125mm to 155mm long
  • Largest ID 77mm, smallest section 70mm
  • Removable threaded rings allow to reverse the focuser direction.
  • Finest pitch among current BORG helical focusers (20% finer than 7762’s)
  • Weight : 650g

Once it is commercially available, I will set my current 90FL F4 system. The extra benefit is BORG is now mechanically ready for the future M75 reducer whenever the large format sensor is getting popular in the amateur astronomy industry.  BORG used to sell 4″ 4-element super reducer before. So as ability, no problem to design at all. The issue is fully depending on the market demand and the availability of sensors.


BORG 90FL F4 + Cooled 6D (A sensor was -4 degree Celsius) + IDAS HEUIBII-52, 16 x 5 minutes


~ by tedishikawa on July 10, 2016.

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