I'm trying to decide between the RF 24-240 f/4-6 and the EF 24-105 f/4. I have Canon R and R7 cameras. I have a converter so that's not an issue. I know the RF has a longer lens. I need to use a flash for a conference (I never used one before). Will the RF be more complicated because it changes f/stops when you zoom and the EF will not? OR am I mistaken? I use right now the SIgma 18-300 lens and I was told that since it's a crop sensor (I use with my R) that it's much more difficult to use with a flash. I'm looking for a lens to use with the flash for that event... but if I can replace the SIgma (all around lens especially for my travel photography) with a better Canon lens I'd like that too!
