it doesn't matter how many megapixels your camera has, the best quality lenses for 35mm format will gas out at about 16X20 size. good 35mm lenses will be noticably blurry at this magnification. try printing some samples of your photos on 8X10 paper, ...
I have made 8x10 prints and they looked OK. Anything bigger begins to show distortion. Leave you negatives together as you receive them and take a strip down to Wal-Mart or a Photo Shop and let them do an 8x10 and you will see how it do. Last I did i...
If you go to a one hour photo "lab" you can ask them for negatives only, but I don't know if they can do that. The machines are pretty much automated, so you may have to get your 4X6 prints. You can go to a camera store that uses a regular photograph...