Table 1: Optical requirements and environmental conditions.
Encircled energy >70% in a pixel ( $13\times 13$ $\mu\rm m^2$ )

Modulation Transfer Function (MTF) >70% at Nyquist Frequency (38.5 c/mm)

Backfocus $\approx$ 50 mm

Transmission (at 550 nm) >70% at the beginning of life

>60% at the end of life (5 years mission)

Spectral range Johnson V band centred at 550 nm

Lens barrel material Titanium alloy (Ti-6Al-4V)

Backfocus (part of Focal Plane Assembly) material INVAR

Radiation dose 42 krad over 5 years (worst case)

Nominal conditions 0 C (in vacuum)

Thermal range (operational conditions) -20 C to +20 C

Thermal range (non-operational conditions) -80 C to +45 C

Vibrations (non-operational conditions) Random: 27 g RMS in the range 20-2000 Hz

**Table 1:** Optical requirements and environmental conditions.
Encircled energy	>70% in a pixel ( $13\times 13$ $\mu\rm m^2$ )
Modulation Transfer Function (MTF)	>70% at Nyquist Frequency (38.5 c/mm)
Backfocus	$\approx$ 50 mm
Transmission (at 550 nm)	>70% at the beginning of life
	>60% at the end of life (5 years mission)
Spectral range	Johnson V band centred at 550 nm
Lens barrel material	Titanium alloy (Ti-6Al-4V)
Backfocus (part of Focal Plane Assembly) material	INVAR
Radiation dose	42 krad over 5 years (worst case)
Nominal conditions	0 C (in vacuum)
Thermal range (operational conditions)	-20 C to +20 C
Thermal range (non-operational conditions)	-80 C to +45 C
Vibrations (non-operational conditions)	Random: 27 g RMS in the range 20-2000 Hz

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