Hello everyone - this is my first here! I have a Sigma 70-300 mm 1:4-5.6 APO (AP/MA/SUP/CAN) lens and Canon 35-80 lens for my Canon SLR EOS 3000 camera (non-ditigal) - will they both work with a Canon Digital SLR EOS-300D Camera that I would like to buy please? I look forward to hearing from you. Thank you. Regards Christopher PS I am not an expert on cameras!