Experiment Focometry using sighting systems

Subjects discussed :
- Adjusting an infinity scope
- Setting a collimator to infinity
- Carrying out the pointing of the focal planes of an optical system to be studied
- Use and application of the Cornu method
- Creation of a fixed front viewfinder

Principles and objectives:
Cornu's method is suitable for both convergent and divergent systems. This is a technique aimed at determining the cardinal elements of a thick system.
To do this, we mark the center of the entry and exit faces of the optical system to be studied. We then look for the 3 positions of the viewfinder for which the image of the collimator, the mark on the exit face and the image of the entry mark are clear. We note these 3 positions again after turning the system over.

Composition :
 ▪ 1 prismatic bench of 2 m with set of adjustable feet (ref.202233)
 ▪ 1 standard prismatic jumper (ref.202234) and 1 vertical prismatic jumper (ref.202237)
 ▪ 1 prismatic jumper with transverse and vertical adjustment (ref.202511)
 ▪ 1 autocollimating scope with cross reticle and rack adjustment (ref.202589)
 ▪ 2 aiming lenses +100 and +200 mm (ref.202580 and 202581)
 ▪ 1 collimator with target reticle illuminated by LED and rack adjustment (ref.202587)
 ▪ 1 Clix component holder (ref.204136) and 6 Clix rings (ref.204201)
 ▪ 4 lenses Ø40 mm f+100, +200, +500 and -100 mm (ref.202274, 202277, 202280 and 202283)
 ▪ 1 plane mirror Ø40 mm (ref.202294) and 1 concave mirror f200 mm (ref.202291)
 ▪ 1 storage rack (ref.202244)
 ▪ 1 experiment note