Ok I seem to be getting back into doing weddings again recently as a second shooter. I’m still rocking my 60D and using my old 450D as a backup, plus I hate changing lenses so only do so twice throughout the day. I’ll do the pre ceremony stuff mainly with my Sigma 17-50 on the 60D, then switch to using my Sigma 50-150 through the ceremony, outside stuff, speeches and then finally swapping back to the 17-50 for the first dance. The other lens is always on the 450D just in case I need a shot there and then but I usually come away with only around 50 images on the 450D and 300-500 on the 60D. One issue I have come across is the fact that I can’t shoot wide, not nearly as wide as I would like. Last week I set up a dress shot in a room that was brilliant (hooked on the back of a great looking wooden door, nice stylish wallpaper, I even set the bedside light just so) but I just couldn’t get wide enough. My mate then came into the room and with his 6D and 17-40 easily got the shot I wanted. Since looking into it I have discovered that my Sigma 17-50 is the equivalent of around 25-75mm on a full frame body. Up until now I’ve always been happy enough with crop bodies and have then always bought lenses for APS-S sensors but as I could do with replacing my aging 450D should I be looking at another 60D/70D (not sure I would need the 80D for the price difference) and getting a wider angles lens such as a 10-20 or should I consider a full frame body and pick up something like a 17-40 and then over time replace my current lenses with ones that could be used on either. The first option would mean I can use all my lenses with either body but I would probably then have 3 lenses to carry each time or the second option would mean I could keep using the 50-150 (equivalent to 70-200 on full frame) on the 60D and only have a single new lens to use on the new body. This is all hypothetical at the moment as I don’t actually have the money to invest but I would like to figure out my options ahead of time. What is everyone’s thoughts??? ps I had been considering a 10-20 lens in the past as I would like to do much wider landscape stuff but didn't think I could justify it.