noun
converter lens
A lens attachment that changes the focal length of a camera lens, such as a teleconverter or wide-angle converter.
このコンバーターレンズを使うと、望遠撮影がもっと簡単になる。
Using this converter lens makes telephoto shooting much easier.
Variant with interpunct; less common but still seen.
Loanword from English 'converter lens'.