I have been using a Canon T-70 since '81. There in lies the problem you may face. I have found that lens with this mount are near impossible to find in my area. There are buys out there on the net,but for me, I need to see in person the item I would buy. That being said, I have been very pleased with the performance of the T-70. I have shot weddings with it but what I do mostly is outdoor nature/landscape work. The body is not weather sealed but I have had no problems with moisture/dust. Maybe because I try follow good lens/film changing practises and I have OCD about keeping my equipment clean. I hope this little bit of information is helpful, be safe and happy shooting...