Hey there Pomacentridae,
I in the same position as you. I am looking to add a viewfinder to my EPL10, I do wish AOI had a 45° view finder. I think this would be the best all around compromise. I wonder if anyone local to me rents the view finders.
I was able to try both out in the store. I realized you can’t really compare the two.
The straight one is really a magnifier. It makes the image look twice as big. It really allowed you to see all the details on screen amazingly clear. However you really need your eye on the viewfinder to see it clearly as there is no eye relief and there isn’t really a viewing angle. Also it is more like a 15 or 20 degree angle.
The 90 degree one on the other hand is really just two mirrors that allow you to see the screen at an angle. It however isn’t really 90 degrees. More like a 70 or 65 degree angle (between a 45 and 90). Versus the straight viewfinder, there is some eye relief to 90 degree viewfinder. You can keep your eye about an inch from the viewfinder and still see into it. And there is a bit of viewing angle, which is helpful in targeting as you can look forward and still see into the viewfinder from your periphery. This made it comfortable to use and aim.
I went with the 90 degree option because that was really my need. But the straight viewfinder was also compelling because of the magnification, like nailing details was so easy with it.
Will be diving with it next weekend.
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