The Optical Design of the 40-in. Telescope and of the Irenee DuPont Telescope at Las Campanas Observatory, Chile

I. S. Bowen; A. H. Vaughan

doi:10.1364/AO.12.001430

Applied Optics
Vol. 12,
Issue 7,
pp. 1430-1435
(1973)
•https://doi.org/10.1364/AO.12.001430

The Optical Design of the 40-in. Telescope and of the Irenee DuPont Telescope at Las Campanas Observatory, Chile

I. S. Bowen and A. H. Vaughan

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I. S. Bowen and A. H. Vaughan, "The Optical Design of the 40-in. Telescope and of the Irenee DuPont Telescope at Las Campanas Observatory, Chile," Appl. Opt. 12, 1430-1435 (1973)

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Abstract

The optical specifications of two astronomical telescopes designed to permit wide-field photography with critical definition are presented and compared. The 40-in. (1.016-m) and DuPont 100-in. (2.54-m) telescopes use modifications of the Ritchey-Chretién design with Gascoigne correctors. By avoiding the need for field flatteners through choice of mirrors yielding zero Petzval sum (40-in. telescope) or bending of photographic plates to a moderate field curvature (100-in. telescope), it was possible to achieve monochromatic images of ⅕ to ¼ sec of arc over fields of 3° and 2.1°, respectively.

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	40-in. Telescope		DuPont Telescope

	inches	millimeters	inches	millimeters
Diameter primary^a	40	1016	100	2540
Focal length primary	162.1	4118	300	7620
Focal length Cassegrain	280	7112	750	19050
Focal length coudé	—	—	3000	76200
Diameter hole in primary^a	15.2	386	32.5	826
Diameter secondary^a	20	508	37.5	953
Diameter corrector plate^a	15.2	386	29.2	741
Distance between mirrors	93.9	2384	202.9	5153
Focal point distance behind surface of primary	24.0	610	39.9	1013
Radius of curvature of focal surface		∞	356	9042
Plate size	14 × 14	356 × 356	20 × 20	508 × 508
Cassegrain scale	0.0345 mm/sec		0.0924 mm/sec
Field size allowing 4-mm margin on plate for mounting	168 min × 168 min		90 min × 90 min

λ(Å)	n	Δn	ΔL	L
3500	1.4770	0.007	−8.8	991.2
4020	1.4700	0	0	1000.0
4500	1.46565	−0.00435	+5.4	1005.4
5000	1.4624	−0.0076	+9.5	1009.5
6000	1.4581	−0.0119	+14.9	1014.9
7000	1.45535	−0.01465	+18.3	1018.3

Distance off axis in minutes	88	70	53	35	18	0
Wavelength range λλ3460–5000 Å, n = 1.4776–1.4624
Radial size of image in seconds of arc
Monochromatic	0.25	0.25	0.22	0.14	0.09	0.06
Chromatic spread	1.27	0.51	0.48	0.33	0.22	0.08
Sagittal size in seconds
Monochromatic	0.21	0.09	0.13	0.15	0.11
Chromatic spread	0.53	0.31	0.13	0.01	0.07

Distance off axis in minutes	63	52.5	42	31.5	21	10.5	0
Wavelength range 3460–5000 Å, n = 1.4776–1.4624
Radial size of image in seconds of arc
Monochromatic	0.19	0.06	0.08	0.14	0.16	0.15	0.13
Chromatic spread	0.83	0.36	0.30	0.25	0.21	0.18	0.09
Sagittal size
Monochromatic	0.18	0.12	0.16	0.17	0.15	0.12
Chromatic spread	0.10	0.04	0.02	0.05	0.08	0.10
Wavelength range 6000–7680 Å, n = 1.4581–1.4539
Radial size of image
Monochromatic	0.30	0.12	0.05	0.09	0.13	0.14	0.14
Chromatic spread	0.23	0.10	0.08	0.07	0.06	0.05	0.03
Sagittal size
Monochromatic	0.25	0.11	0.12	0.12	0.12	0.14
Chromatic spread	0.03	0.01	0.01	0.01	0.02	0.03

	40-in. Telescope		DuPont Telescope

	inches	millimeters	inches	millimeters
Diameter primary^a	40	1016	100	2540
Focal length primary	162.1	4118	300	7620
Focal length Cassegrain	280	7112	750	19050
Focal length coudé	—	—	3000	76200
Diameter hole in primary^a	15.2	386	32.5	826
Diameter secondary^a	20	508	37.5	953
Diameter corrector plate^a	15.2	386	29.2	741
Distance between mirrors	93.9	2384	202.9	5153
Focal point distance behind surface of primary	24.0	610	39.9	1013
Radius of curvature of focal surface		∞	356	9042
Plate size	14 × 14	356 × 356	20 × 20	508 × 508
Cassegrain scale	0.0345 mm/sec		0.0924 mm/sec
Field size allowing 4-mm margin on plate for mounting	168 min × 168 min		90 min × 90 min

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Applied Optics