Takahashi TSA-120 on EM-11 Temma-2M

Takahashi TSA-120 on EM-11 Temma-2M

Intermediate instrument between the TSA-102, of which it takes again the main features, and the TOA-130, TSA-120 refractor replaces the famous FS-128. The TSA-120 is characterized by its simplicity, its versatility and his exceptional quality/price ratio.

TSA-120 features the specifications of the TSA-102S : an apochromatic objective with triplet ED, a retractable dew-shield, great mechanics and versatility of use, both visual and photographic. Moreover, TSA-120 is extremely light, it weights only 6.7 kg. Even when TSA-120 is fully equipped for CCD imaging, EM-200 will easily holds it. No extra heavy mounts will be required.

This refractor can be equipped with the same optical accessories as the TSA-102, including the focal reducer TOA-RD #18, the field corrector TOA-FL35 and ED 1.5x and TOA 1.6x extenders. The specific system-charts will help you to specify the necessary configurations.

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- Triplet Super Apo
  • Optical mounting- Air spaced
  • Glass types- ED et Crown
  • Optical coatings- Multicouche BBAR (BroadBand anti-reflection)
  • Aperture- 120mm
  • Focal length- 900mm
  • Focal ratio- F/7.5
  • Resolution- 0.97”
  • Visual limiting magnitude- 12.1
  • Light grasp- 293x
  • Image circle- NA
  • Photo field- NA
  • Focal length (With TOA35-FL field flattener)- 882mm
  • Focal ratio- F/7.3
  • Image circle- 40mm (60% non-vignetted)
  • Photo field- 2.6° @ 40mm image circle
  • Spot sizes- 7µm RMS @ center of field, 7µm RMS @ 10mm off-axis, 7µm RMS @ 20mm off-axis
  • Focal length (With TOA35-RD reducer)- 672mm
  • Focal ratio- F/.5.6
  • Image circle- 40mm (60% non-vignetted)
  • Photo field- 3.4° @ 40mm image circle
  • Spot sizes- 4µm RMS @ center of field, 6µm RMS @ 10mm off-axis, 13µm RMS @ 20mm off-axis
  • Tube length- 990mm
  • Tube diameter/dew-shield diameter- 125mm/160mm
  • Tube weight- 6.7kg

EM-11 Temma-2 Jr 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-  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