
He's travelling to europe soon and is keen to get another lens. Currently he is looking at the 70-200 F4 or the 24-105 F4 IS. I have the 70-200 and have travelled with the 17-40 and 70-200 combo and suits me okay, but I really think that maybe the 24-105 is a good idea as I doubt he'd need more than 100mm for landscape/cityscape type photos over there?
His main use back home is shots of his kids, just general photos (I know he has grumbled about 17-40 being a bit limiting for those shots - not enough zoom, but I tell him the 17-40 is a better investment than the 70-300 generic zoom he was looking at getting).
Suggestions - what focal lengths do you use for travel in Europe? He will be hitting Germany, Italy and Greece. I am imagining most of it will be wide angle type stuff anyway, with maybe the odd zoom on some feature of a building or city (in which case, is 100mm sufficient, or is 200mm better?).