I think the early 2.8 Elmar, and the 3.5, are both pretty resistant to unexpected flare so they may not be the thing for you. The Summitar on the other hand has an extra stop and does flare and 'glow' a bit wide open even with a hood. You would need a cheap adapter to put 39mm filters and hoods on, but it is a fine lens and developing a cult status given its change in character from wide open to stopped down. The Summicron on the other hand is much more even across its range, falling off in detail rendering wide open but not nearly the type of 'glow' a Summitar has.

Steve