I think for my 35mm summaron f3.5 I used to have, I just bought a 39mm no name vented hood on ebay and it worked like a charm. I'm not really interested in the "brand" of hoods if they serve the function. Obviously nice to fit a filter with the hood when the design allows for it, which I have with the Summicron, but for $200....I'd rather buy 3 bulk rolls of Tri-x and have 60 rolls to shoot after getting a $12 no-name hood and shoot a filter without a hood when the time called for it.