Best telephoto lens for the fujifilm x a3?

Here is what the site says about that.

From Fujifilm X-A3: Fujifilm X-A3: A mirrorless camera by Fujifilm with a 24.2-megapixel APS-C sensor, announced in 2016. Specs - Maker: Fujifilm - Mount: Fujifilm X - Sensor: APS-C, 23.5 x 15.6mm, crop factor 1.5 - Resolution: 24.2 megapixels - Stabilisation: none in the body; use stabilised lenses for slow shutter speeds - Announced: 2016 - Type: mirrorless camera Focal lengths on it Lenses frame like 1.5 times their focal length on full frame: 16mm ...

From Sensor sizes: What it costs you: - Size, weight and price, especially of the lenses. A full-frame telephoto is much larger than its APS-C or Micro Four Thirds equivalent. - Less depth of field when you want more of it, for macro or landscape.

Quoted from this site's pages.