I'm thinking about buying a viewfinder that will allow me to look into my viewfinder in portrait orientation without having to bend my neck sideways.
The only thing I have found close is this:
Canon Angle Finder C
You can see it here:
http://www.adorama.com/CAAFC.html
However, I don't think this is what I need, since this looks like it is only a top, bottom, left of right viewfinder. It's very cool in it's own right, but I don;t think it would even allow you to view in landscape mode, unless you were below, above, or to the sides of the camera.
Is there such a thing as a "portrait" angle viewfinder?
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Your question could be worded a bit better I think. I'll try to answer what I think you're trying to ask.
The Anglefinder C slides onto the viewfinder from above, when the camera is in landscape orientation. You slide the eyepiece rubber surround upwards and off. Then the Anglefinder slides on. The finder pivots through 360 degrees. So, when the camera is in landscape orientation, you can look down from above, or by rotating the finder, you can look from either side, or even from below.
If you put the camera into portrait orientation, you simply rotate the finder so it's pointed upwards, and when you look down into the viewfinder, you'll see the camera's image in portrait orientation. You can still pivot the finder araound so that you can look int the viewfinder from the right or the left, or also from below.