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I would like to get a lens hood for my 35mm f2 summicron (Canadian one with focus tab) but they seem to be expensive and not that easy to come by. Do I have to buy a leica hood? Anyone know the best place to get one?
You don't have to buy a Leica hood but the OEM hoods are designed for the lens and the camera. If you buy the Leica hood you can be sure that you will not suffer from a vignetting effect and that there will be a cut-out in the hood in the area where it will obstruct your viewfinder.
Other alternatives are Heliopan who make a large variety of hoods, get the small 39mm metal - don't know whether you will get vignetting or a clear viewfinder though. Model nr. is 9803-1039. In Europe