My Dad (who is 65) is getting married again in April He is just having a low key afternoon garden wedding and has asked me to do the photos. Now, I am no pro and have told him so - although I can take a reasonable picture - however he has said that what I take will be good enough for him. I have a 7D with 50mm 1.4 and 100mm that I will definitely take with me. I also have the very basic kit lens 18-55 and a 70-300 F4 (normal one). I am going to hire a lens and thought of the 70-200 F2.8. Is this my best option or should I go with something like the 24-70? I will also have a flash. Thanks!