The TEC300VT-7DEG telescope has been designed to match the optical images with the widely-spread now CCDs with the pixels size 9-12 μm and the sensor size 36.9 x 36.9mm (diagonal 52mm) In particular, the FLI Microline or Proline16803 and the Moravian G4-16000 cameras based on the KAF-16803 chip with the 4096 × 4096 pixels of 9 μm. Another CCD camera, the FLI PL 09000, includes the KAF-09000 chip with the 3056 × 3056 pixels of 12 μm size (36.67 mm × 36.67 mm), the diagonal length is 51.9 mm.
The telescope’s optical layout provides images of the stars in the integral visual light (454nm-836nm) of diameter less than 9 μm, i.e. not larger than one pixel, all over the field. Secondly, the effective focal length of the telescope, F = 425 mm, and the angular diameter of the field of view, 2w = 7º.0, provide the linear field of diameter 52.1 mm.
Optical tube assembly
Weight incl. FLI camera ~40 kg
Full length (Baffle front edge - rear side of FLI) 1030mm
Optical design by Professor Valery Terebizh, Sternberg Astronomical Institute, Moscow State University, Russia
Mechanical design features
A-thermal Titanium cells Invar rods assembly for thermal stability of the focus
Orthogonal tip-tilt adjustment of the camera focal plane, adjustment range 0.25 deg.
45 deg. camera axial rotation
Belt driven focusing mechanism, focusing range 5mm
Specifications
Design |
Terebizh Catadioptic |
Design Version |
VT99c |
Entrance Pupil Diameter |
300mm |
Effective Focal Length |
425mm |
Focal Ratio |
F1.44 |
Scale in Focal Plane |
2.06µm/arcsec |
Primary Spectral Waveband |
420-840nm |
Angular FIeld of View |
7° |
Field Curvature |
Flat |
Linear DIameter of FIeld |
52.1mm |
Fraction of Unvignetted Light - Optical Axis |
0.70 |
Fraction of Unvignetted Light - Edge of FIeld |
0.57 |
Effective Aperture Diameter - Optical Axis |
250mm |
Effective Aperture Diameter - Edge of FIeld |
227mm |
Back Focal Length (Last lens surface to CCD) |
70mm |
RMS Spot Diameter (Center / Edge) |
2.3 / 3.8µm |
Diameter of circle containing 80% energy (Center / Edge) |
5.5 / 7.1µm |
Maximum Distortion |
<20% |
System Length - Last Surface |
373mm |
System Length - CCD Detector |
443mm |