olemus
objektiivi fookuskaugust pikendav lisalääts(estik)
=
a secondary lens mounted between a camera and a photographic lens which extends the focal length

näiteid
https://duckduckgo.com/?q=lens+extender&t=h_&iax=images&ia=images

ülevaateid
https://en.wikipedia.org/wiki/Teleconverter