Best telephoto lens for the sigma bf?

Here is what the site says about that.

From Sigma BF: Sigma BF: A mirrorless camera by Sigma with a 24.6-megapixel full frame sensor, announced in 2025. A minimalist body machined from one block of aluminium, with built-in storage instead of a card slot and no viewfinder. Specs - Maker: Sigma - Mount: L-Mount - Sensor: Full frame, 36 x 24mm, crop factor 1.0 - Resolution: 24.6 megapixels - Stabilisation: none in the body; use stabilised lenses for slow shutter speeds - Announced: ...

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.

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