Takahashi FSQ-85EDX EM-11 USD-3

Takahashi FSQ-85EDX EM-11 USD-3

With the success of short refractors and improvement of the performances of CCD and DSLR cameras, Takahashi introduces the FSQ-85ED, more itinerant than the FSQ-106ED model, and intended for deep-sky and wide field photographers.

The FSQ-85ED is based on the same ED glass Petzval quadruplet design as the FSQ-106ED model, but offering a focal length of 450mm and a photo field of 5.6°, which is ideal for photography. It is equipped with an oversized rack-and-pinion focuser and an independent camera angle adapter. An optional focal reducer is also available in order to transform the refractor into a true astronomical tele objective with a focal length of 328mm and with a focal ratio of 3.9, providing a field of view of 7° and a 40mm image circle.

Weighting only 4kg without accessories, you will not need a heavy mount. It becomes easy to take pictures of the deep-sky while transporting your telescope under the best skies.

Mount Description:

The EM-11 is a very compact and transportable German equatorial mount, with a maximum loading capacity of 9 kg. The serious amateur will reserve it for OTAs weighting up to 6 kg, such as the TSA-102, Mewlon-180 or Maksutov-Cassegrain of 150mm diameter, in order to take advantage of the effectiveness of a mount over sizing. The tracking accuracy of the EM-11 thus gives its best in using OTAs until their limits in imagery. The EM-11 becomes, in this case, a compact and efficiency EQ mount with an excellent transportability/performances ratio, adapted to the itinerant amateur. 

Optical Specification:

  • Optical design- Modified Petzval quadruplet apochromat
  • Aperture- 85mm
  • Focal length- 450mm
  • Focal ratio- F/D 5.3
  • Resolution- 1.5”
  • Limiting magnitude- 11.6
  • Light grasp- 178x
  • Image circle- 44mm
  • Photo field- 5.6°
  • Back focus- 197.5mm
  • Focal length (With Reducer-QE 0.73x)- 328mm
  • Focal ratio- F/D 3.86
  • Image circle- 40mm
  • Photo field- 7°
  • Metal back- 72.2mm
  • Tube length (min/max) w/ standard accessories- 553mm-645mm (retracted dew shield/extended dew shield)
  • Tube diameter- 95mm
  • Rack-and-pinion tube diameter- 80mm
  • Tube weight- 4Kg

EM-11 USD-3 Mount Specification:

  • Type- German Equatorial Mount
  • R.A. Slow-Motion- Motor driven
  • DEC. Slow-Motion- Motor driven
  • Azimuth Adjustments- ± 10°
  • Elevation Adjustments- 20 to 50°
  • Polar Finder / Accuracy- Built-in / 5'
  • R.A. Setting Circle Accuracy- 10 arcminutes
  • DEC. Setting Circle Accuracy- 2°
  • Encoders- Not Supplied
  • Weight (without counterweight)- 7 kg
  • Counterweights- 3.5 kg
  • Maximal Loading Capacity-9 kg (without counterweight)
  • Optimal Loading Capacity- 6 kg (without counterweight)
  • Operating Voltage- 12V / 24V DC
  • Power Consumption-  12V : 0.3A (tracking at sidereal rate), 1.3A (high speed slewing), 1.7A    (starting) 24V : 0.3A (tracking at sidereal rate), 1.9A (high speed slewing), 1.9A (starting)
  • Tube moutings- 2 x M8 screws (separated by 35mm)
  • Mounting Capacities- Tube rings, plates and dovetail mounting plates
  • Option- Tripods, stand piers
  • R.A. axis diameter (material)- 52 mm (aluminium)
  • R.A. worm gear shaft diameter (material)- 14 mm (iron)
  • R.A. gear diameter (material)- 74mm/144 teeth (zinc)
  • DEC. axis diameter (material)- 52 mm (aluminium)
  • DEC. worm gear shaft diameter (material)-  14 mm (brass)
  • DEC. gear diameter (material)- 74 mm/144 teeth
  • Stepper Motors Accuracy- 100 pps
  • Slow Motion Speeds- 0.1x to 1.9x the sidereal rate
  • High Speed Mode- 120x the sidereal rate (12V DC)/ 240x the sidereal rate (24V DC)
  • Worm gear shaft cycle- 10 minutes
  • Tracking Accuracy- ± 10"
  • Autoguiding- SBIG ST-4/7 compatible