Simulation of various telecentric setup

(Copyright  Christian Viladrich)


C11 Edge HD with 3.5× and 4.2× telecentrics


 IMX432 sensor:
- 1608 pixels × 1104 pixels,
- 9 microns pixel,
- corner = 8.8 mm from optical axis,
- right = 7.2 mm from optical axis,
- top = 5.0 mm from optical axis.

Optical prescriptions:
- C11 EdgeHD model courtesy from Vlademir Saceck.
- telecentrics :
- 3.5× and 4.2× telecentric made from Edmund Optics/ Thorlabs parts:
- 3.5× telecentric = 75 mm divergent doublet and 250 mm PCX singlet. Distance between lenses = 177 mm.
- 4.2× telecentric = 75 mm divergent doublet and 300 mm PCX singlet. Distance between lenses = 227 mm.


C11 EdgeHDf/10:




C11 EdgeHD with 3.5× telecentric:






C11 EdgeHD with 4.2× telecentric:

Takahashi Mewlon 250 with 3.5× telecentric:

C11 classic (optimised for green light) with 3.5× telecentric:
Optical prescription
An old an incomplete prescription is provided in the Celestron 1981 manual:
- f = 2800 mm,
- d1 = 284.5 mm,
- R1 = -1136.6 mm,
- d2 = 78.7 mm,
- R2 = - 325 mm,
- amplification ratio = 4.95,
- thickness of corrector = 4.76 mm,
- distance between apex of M1 and focus < 225 mm.
Note that, back then, the Celestron OTA were optimized for red light.

Part of this prescription was used in  ATMOS to design a proxi of the C11 classic optimized for green light . The main input data were:
- f, R1, d1, thickness of corrector, back focus.


C11 classic (optimized for green light) with 3.5× telecentric:
C11 classic (optimized for green light) with 4.2× telecentric:

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