Hi,I would go with the f/2.8 aperture. Shooting a crop sensor in a dim theater I would really like more than f/4 to work with.Compare the 80d and 60d
in high ISO
on DXO mark. The improvement is not huge.The 24-70 is by all accounts a beautiful and sharp lens. On a budget you might consider the very good EF-s 17-55 f/2.8 IS. That even leaves room for adding a longer and even brighter 85mm f/1.8 or 135mm f/2 prime.ScottCanon 5d mk 4, Canon 6D, EF 70-200mm L f/2.8 IS mk2; EF 16-35 f/2.8 L mk. III; Sigma 35mm f/1.4 "Art" EF 100mm f/2.8L Macro; EF 85mm f/1.8; EF 1.4x extender mk. 3; EF 24-105 f/4 L; EF-S 17-55mm f/2.8 IS; 3x Phottix Mitros+ speedlitesWhy do so many people say "FER-tographer"? Do they take "fertographs"?