ok so i have a sony a200 dSLR and i'm not sure if i should get an external flash or a really nice lens. i'm really on a budget so i dont really know what i'm looking for. do dSLR flashes all fit everything? or are they somewhat proprietary? i was looking at this: http://www.henrys.com/webapp/wcs/st...rtmentId=10407&categoryId=10412&itemID=181006 because i want a lens that will give me some nice DOF. and for flashes i'm really not sure what i need to be looking for, i live in windsor ontario so i'd like something local if you can find it, www.henrys.com is where i'd like to look because there is one really close to my dorm. edit, i just realized that was the opposite of what i wanted. i'm really just a beginner with f-stop and aperature.