You asked

What lenses should I buy 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 cst1 likes cameras: How to choose, in three questions: 1. What do you want to photograph? People, places, wildlife, sport, video, or a bit of everything on holiday. Pick your use case below and start there. 2. How much will you carry? The best camera is the one you take with you. A big kit that stays at home takes worse pictures than a pocket camera that comes along. 3. Which lenses will you want in two years? You ...

Quoted from this site's pages.

From these pages