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Document : VST_050698_energy.doc Release : 1

First rel.date: 05.06.98 Last rel. Date: 05.06.98 Page 1 of 2 Number of pages 2

SPOT RADIUS VALUES IN WHICH 80 % OF ENCIRCLED ENERGY IS ENCLOSED FOR THE VST OPTICAL SOLUTION WITHOUT ADC

Authors: D. Ferruzzi, G. Marra Supervised by: D. Mancini Checked by: D. Mancini

1. Introduction In this document a study of the spot radius values in which 80% of encircled energy is enclosed, for the VST optical solution without ADC corrector for mirrors alone is reported. The radius values are calculated from U to I bands. 2. Spot diagrams and encircled energy for M1 and M2 alone Spot diagrams on the image plane corresponding to the mirrors alone, without corrector camera and ADC are reported in Figure 2-1. In Table 2-1 the radius values in which 80 % encircled energy is enclosed, are shown. In Table 2-2 the optical data for the two mirrors and their combination are reported.

Figure 2-1 Spot diagram on the image plane for the two mirrors alone
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Document : VST_050698_energy.doc Release : 1

First rel.date: 05.06.98 Last rel. Date: 05.06.98 Page 2 of 2 Number of pages 2

Field of view angular radius (deg) 0 0.3535 0.4999 0.707

Radius in which 80% of EE is enclosed from U to I bands 0.76 mm 0.44 mm 0.4 mm 1.16 mm

Table 2-1 Radius in which 80% Encircled Energy is enclosed, from U to I bands for the mirrors alone at the different fields of view VST optical data for the mirrors alone Primary mirror M1 Diameter 2500 mm Ray of curvature -8333.7 mm Conic constant -1.120912 Secondary mirror M2 Diameter 806.87 mm Ray of curvature -3437.2 mm Conic constant -4.623826 Distance between M1 and M2 2958.3 mm M1 +M2 Back focal distance 1108.12 mm Image diameter 346.78 mm Table 2-2 VST optical parameters for the mirrors alone

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