I am using lenses that i had on my EOS 1n on my 7D they are EF lenses..

Why no 50 mm I think that's a great lens for the money or if you want one that may not be many here like but if i take kids say Disney Land I use my Canon 18 to 200 its good for those outings i like the canon 85 1.8 that's very sharp lens good portrait lens. those are my 3 i use the most I have canon 200 to 400 but so darn heavy great if you have room for tripod .. I used my friends Sigma i think was 17 to 70 very compact and nice sharp lens. But i am using old bodies like Canon 50D and a canon 7D fiilm Eos 1n and A5 I really like the old Konica FT1 and there lenses are nice .my old 7D just keep on going lol looks like new though all mine are clean .