אנגלית ⇄ גרמנית רוסית +

image-side focal length
.אופטי	bildseitige Brennweite (distance from the centre of a lens to its principal focus on the image side); hintere Brennweite (distance from the centre of a lens to its principal focus on the image side)
image side focal length
.אופטי	Bildbrennweite f (distance from the centre of a lens to its principal focus on the image side)