I have been told that the 300mm lens would be a good standard lens to use on an 8 x 10 format for studio photographs = portraits and full figure.

I have also been told to use a 450mm lens in preference to the 300mm.

I would like to hear what some of you experts use in the studio.

If I could also use the lens in a outdoor setting (landscapes) that would be an extra bonus.

I intend to try a 210mm lens that I already have.

Answers always appreciated.