Je n'ai pas d'expérience avec cet objectif.
Par contre, c'est intéressant comme construction.
{...
A super wide angle lens with a diagonal angle of view 82°, developed based on Topogon (manufactured by Carl Zeiss, Germany. Angle of view: 100°. f/6.3). This lens has a unique optical system: a spherical lens element with a very high refraction index is used as the first lens element and a special optical glass lens element with the infinite radius of curvature is used as the rearmost lens element. This lens was the fastest lens in the world as a 25mm lens at the time.
} ...désolé c'est en anglais
Du musée Canon,
ce lien 
https://global.canon/ja/c-museum/wp-con ... uction.gif
Posté: dimanche 29 septembre 2024 - 20:03
