| 41. | As opticians, they constructed the 76-cm refractor telescope at Nice Observatory, among others.
|
| 42. | He brought with him an optical tube assembly for a 6-inch f / 15 refractor.
|
| 43. | The hallmark of Holophane luminaires, or lighting fixtures, is the borosilicate glass reflector / refractor.
|
| 44. | I want to know what type of telescope it is : refractor, reflector, or catadioptric.
|
| 45. | The Standard Refractor was worth $ 100 when released, and the value increased to $ 125.
|
| 46. | It is a refractor with double achromatic lenses of 40 cm diameter and has 5m focal length.
|
| 47. | Another good choice for a beginner is an 80mm refractor, also on a German-equatorial mount.
|
| 48. | The observatory now uses a refurbished 8-inch Reed refractor for visual observations of planets and stars.
|
| 49. | Attached to the main telescope are two guide telescopes : an 18 cm and an 8 cm refractor.
|
| 50. | The sub-telescope is a 15-cm apochromatic Kepler refractor of focal length 180-cm.
|
