Background: <p> I have used 35mm SLRs for about 40 years and have just recently bought a secondhand ETRS with a 75mm lens. I gather this corresponds to the standard 50mm lens on a 35mm camera. <p> Questions: <p> How do other medium format lens focal lengths correspond to 35mm ones? What is the best focal length for landscape photography? <p> I feel like I'm starting out all over again! Any advice would be welcome. Thanks.