I think we had one member with a turret viewfinder back in 2012. I've got a Tele-Wide finder, and thought about getting a turret, but apart from the hey-look-at-this factor, decided it wasn't worth it. Even with multiple focal lengths and adjustable parallax setting, an add-on finder isn't going to give you more than an approximate idea of your composition. Except in the brightest of bright sunlight, I've been able to get that from the LCD. I've found a bubble level to be a more useful hotshoe accessory.
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