The making of robust and highly performing imaging spectropolarimeters for large solar telescopes

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Table 4

Prescriptions of the narrowband lens system of CHROMIS.

Lens	Radius (mm)	Thickness (mm)	Lens dia (mm)	Glass
L1	75.80	3.4	40	S-BSM10
L1	37.80	10.2	40	S-FPL53
L1	−95.81	129.3	40
L2/L3	292.26	5.0	80	PBM18Y
L2/L3	102.74	16.0	80	BSL7Y
L2/L3	−285.24	66.7	80
L4	85.95	8.0	30	S-FPL51Y
L4	−28.32	3.5	30	PBL6Y
L4	−74.38	91.6	30

Notes. Of the four lenses of the narrowband system of CHROMIS, L2 and L3 are identical. All lenses are cemented doublets. Duplicates of L1 and L4 were used to build the corresponding wideband system of CHROMIS.

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