nhfoley It is actually slightly less coverage... I designed it more as a bash-and-fingerprint guard, less to protect from all sources of flaring.
I made my FE55 hood public, here: https://www.shapeways.com/product/WXR4UU8EE/fe55-hood-v0-4-beta?optionId=60860329
As it says in the description, the detent lock which helps the hood find perfect rotational alignment needs some work. The FE55 and RX1 use a slightly different system here. The fit is snug enough, though, that the hood can be used without issue nonetheless. I've been using this on my FE55 for a year or so.
nhfoley@fbd9e5b Hey! Sort-of / Not-really. Though the bayonet mount and filter diameter between the two lenses are the the same, the front of the lens is slightly different and it causes some fit issues, though you can cram it on.
I have made a specific variation of this hood that does work properly with the FE55, though I've never posted it to shapeways. I have used it for a year or so and it does work great.
Let me review it when I get home, making sure that there isn't anything I need to update. I will then post it online.
nhfoley@helloterran It is bayonet mount. I updated the description to make this more clear. Thanks!