I will also share my experience from the trip to Greece. One week, lazy most of the time (beach and pool mostly).
I took 5D2, 50 1.4, 24-105, 70-200 F 4 L IS, ext 1.4 II
I didn't make a lot of photos (about 1000 of all), have chosen 139 as "good enough" to keep them.
In those 139 photos:
- 9 made with 24-105
- 11 with 50 1.4,
- 107 made with 70-200,
- 12 made with 70-200 + ext.
Checking all the focals used on photos, the average weighted focal was 133.
When using 70-200: 30% of photos were @200mm and also 30% were @ F4 (what means that it's too short and too dark lens for me because I would use wider than F4 and longer that 200 if I could)
Looking at all the statistics, if i were you and took 7D with 24-105 and would like to make all 139 photos which I decided to keep, I would miss:
- 2 photos because I would need wider than 24mm on crop
- 3 photos because I would need faster than F4 @50mm
- 52 photos because I would need longer than 105mm on crop
That's me, my style of shooting, place where I was and subjects which were shot. You can have quite different needs.
Below I attach bubble graphs for real geeks:
- the bigger the bubble the more photos at specific focal and aperture
- horizontal axis take focals, vertical - take apertures
- the bubbles for different lenses don't have the same size meaning specific amount of photos (ie bubbles on 24-105 showing one photo are bigger than those on 70-200)
Explanation - I'm not crazy, just wanted to check what I use mostly and if my lenses were apropriate for me.