Anglais ⇄ Allemand Russe +

image-side focal length
optiq.	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
optiq.	Bildbrennweite f (distance from the centre of a lens to its principal focus on the image side)