I am very confused. I plan to get a medium format SLR which has interchangeable film back. I have been shooting Yashica TLR and my love of 6x6 format is inclining my choice to Hasselblad. However, the lens collection for film hasselblad is not good. I am looking at getting a super wide and a super tele lens. Any suggestion regarding which system I should consider? Also, I adore systems which do not need battery in any form (well, metering purpose is fine).