About us

Gemini Telescope Design (short name GTD)  is a company based in Italy. It has been founded in 1996 (see company history timeline). Its main profile is the design and manufacturing of telescope mounts and drivers. We are serving amateur and professional astronomers in the field with precision mechanics and electronics around the world.
The owner and General Manager of Gemini Telescope Design is András Dán. András Dán combines his field experience (an amateur astronomer since 1984), the solid basics that came with his M.Sc in Mechanical Engineering and the latest technology available from his contractors. He puts the emphasis on lasting materials, innovative design and a reliable customer support.

The owner and General Manager of Gemini Telescope Design is András Dán.

András Dán, MSc – The owner and General Manager of Gemini Telescope Design.

Company Visual Identity

The logo and logotype are the basic elements of the visual identity of the company Gemini Telescope Design.

Company History

  • 1996: Gemini G10
    The first German Equatorial mount designed and produced by Gemini Telescope Design, for small and medium instruments. Sold mainly in Hungary and Germany, many examples are still functional as the design was simple and resistant. First offered with a clock drive, were later fitted with a dual axis stepper drive. The photo shows a refurbished version with Pulsar driver.
  • 1998: Gemini G40
    This mount was our first project based on the direct drive idea (no reduction between stepper and worm) and at its time had few rivals in precision and stability (up to 40kg payload). Was offered with a dual axis stepper drive (5phase steppers from BergerLahr), a goto drive of Hungarian development (Coordinator2000) and later with FS2. A heavy duty mount difficult to destroy.
  • 2001: Gemini G41
    A redesigned version of the G40 with the same performance but considerably less weight.
  • 2003: Gemini G41 filed
    This is a version of the G41 that was even more lightweight, with slightly less load capacity, ideal for travelling astrophotographers. It is the sister of the G41Obs, a heavier version of the same concept. The first mount offered with our Pulsar driver.
  • 2003: Gemini G41 Obs
    Our solution for small and medium observatories, this mount is a facelift version of the G40 concept with worm encoder based PEC and an internal slip ring for the DEC motor cables to avoid cable tangling problems.
  • 2005: 50-cm RC with a traditional fork mount
    This was a turn-key project realized entirely by Gemini (except optics from Marcon) in an orthodox style, with an extremely stable fork mount using 500mm worm gears in both axes. The mount is driven by steppers and Pulsar.
  • 2005: Mountegra
    Featured also in the magazine Coelum for its unique design, remains the only serious one arm fork ever made in Europe.
  • 2007: Gemini G42 Obs+
    This mount is the last in the line of our high precision worm gear based drives with a unique spring loaded worm support in RA providing low PE tracking quality, further improved by PEC. This mount was offered exclusively with Pulsar and later Pulsar2.
  • 2003 and 2009: PULSAR 1 and 2
    Pulsar was the first drive system for steppers developed by Gemini Telescope Design, it was among the first to offer worm encoder based PEC and an intelligent hand controller with a user configurable parameters menu and GPS reading. It has been superseded by Pulsar2 that offers incremental encoder handling, stepper and servo handling, improved microstepping for very low total reductions and more.
  • 2010: 40-cm RC telescope for university research sitting in a fork mount, based in NE Hungary.
    The declination drive of this fork is a friction drive.
  • 2011: Gemini G53F
    The first commercially available mount with a pure friction drive, with an unrepeatable stability and precision. This product represents our force at innovation in the field of astronomical instruments. Behind the leading products Gemini offers, there are a number of companies in the leading edge of technology.
  • 2011: Mofod MkII
    Another university project, for spectroscopy, featuring a 50-cm RC and the friction drive fork that provides the precision necessary for long exposure spectroscopy to reveal radial velocity fluctuations of stars having exoplanets. The mount is driven by Pulsar2.
  • 2014: Integra 85
    Innovative product that will solve your focusing and rotating needs with a short backfocus.


gemini-telescope-design-products-evolution-timeline