eh hi, haha, the ans is Y not? as long as u stand far enuf lor.... the reason y 50mm gd for single portrait shot i believe is due to the "close up" u get.... compared to maybe a u noe, 35mm.... btw, i'm still learning oso, so correct me if i'm wrong. anyway back to the topic. personally i had used the 50mm to take grp shot before, well the pic is gd, i get the pic i want. but eh one thing abt 50mm grp shots is that u need to really stand very far away.... jus imagine ur standard kit lens(18-55). if u were given one, will u choose to shoot at 20mm or at 55mm if the grp is right smack in front of u? chances r 20mm for most ppl i believe... so yea, that the link behind it la, using a wider lens is more convenient lor, as in dun hav to be limited n stand so far away from ur subject. if cld be weird at times.... imagine tak grp shot the photographer stand perhaps 3m away?? hope this helps you!