Yeah, I've seen those. They're such utterly losable little things, with what seems to me minimal utility, that I always wondered why they bothered. But Fabrizio considers them important, and of course there's no disagreement with what someone else finds useful. Just goes to show about tastes and styles.
I used to have a Nikon F2AS and currently an F3HP and F5 and all of them have the viewfinder blind and I never used them.
Don't think my Mamiya had one though, however I'm not often doing super long exposures with that.
The Noteworthy Ones - Mamiya: 7 II, RZ67 Pro II / Canon: 1V, AE-1 / Kodak: No 1 Pocket Autographic, No 1A Pocket Autographic
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The Pentax ESII had two automatic settings, one that blacks out the finder.
Also the cases that came with Pentax Spotmatics has a little pouch for batteries.
Both nice touches...
Eyepiece shutter - little plastic/rubber widget... I've got 'em, I've never used 'em. If I'm going to take the time and trouble to set my camera up on a tripod and attach a remote cable, I'm also going to set it to Manual and use an external light meter.
I almost died laughing when I first saw the hot shoe cover/eyepiece blind/battery door lever that came with a friend's A-1. He broke one of the two tiny tabs that hold it onto the eyepiece, rendering it unusable, so he threw it away. A few years later he was wondering why they made the battery door so hard to get open.