What does the F version of Bosch drills add over the non F versions?

Supercell

I'm looking to get a Bosch "Professional Rotary Hammer GBH 2-26 F" or a "Professional Rotary Hammer GBH 2-26" SDS+ drill.

Looks like the chuck at the end is longer at the end of the F version but for the life of me cannot figure out what that does, also the F version is about €50 more expensive but all other specs are identical.

There seems to be F and non-F versions of most of their other drills, does anyone know what this is for, maybe Fast keyless bit change or something?

Lumen

Quick change chuck.

Around 1:10 here

https://youtu.be/DaJuC4bqyQY

jack of all

Good answer from Lumen there; I have one of those Bosch drills with the quick change chuck option, very useful and worth the extra €50, especially if you plan on drilling large holes in wood or metal with standard or hex shank bits.

Supercell

Just saw this now, thanks lads, got the F version and delighted with it, just the job.