We whoot portaits in studio and use strobes for light. I already own the 24-70 F2.8 but i am looking for a second lens to leave in the studio. I am ussually shooting weddings, so for the studio we need another lens. For portaits we ussually shoot at F3.5 with the 24-70. But lightning is no issue, we could easily increase to F4 and adjust ISO or increase power of the strobe. So with that thought i was wondering if I should get the 24-105 for the studio. The extra focal length will be very valuable for us. And we dont need the extra F-stop. Is anyone using 24-105 for studio? Is it a bad call? Should I keep using the 24-70?