I have a SMC Pentax-M 50mm 1:2 prime lens and a Pentax MC auto 28mm 1:2.8 from my dad. I have been looking at two *film cameras* lately, the Pentax MG and the Canon AE-1. If I buy the Pentax MG I know I can use the lenses. If I buy the Canon AE-1, can I still use these two lens? Or do I need to use an adaptor?