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The Two-degree Prime Focus system (PRI) is composed of:
The following pictures represents the system. The Fibre Positioner = which is for completeness does not form part of this system.
The optical system for the WEAVE Prime Focus Corrector is composed of&nb= sp;six lenses made of different materials with specific characteristics.
The purpose of the WEAVE Prime Focus Corrector (PFC) is to correct for t= he (geometrical) optical aberrations in the two-degree field-of-view (WHT= =E2=80=99s primary mirror is parabolic). It also comprises an Atmospheric D= ispersion Corrector (ADC), performed by two pairs of counter-rotating air-s= eparated doublets, to compensate for atmospheric dispersion (chromatism) wh= ilst the telescope is moving in elevation.
The optical layout for the PFC design is shown below:
The characteristics of the optical design are:
The performance of the optical design is such that 80% of the energy is = encircled within 1=E2=80=9D or 56um (~50% contribution from the optical des= ign & ~50% contribution from the manufacturing tolerances).
This image quality is met for these conditions, simultaneously: