Interesting...
Are we now at the point where 0.2 is too short throw for a curved screen to work?
Cheers
G
Absolutely!
I had purchased 3 optima gt5500+ projectors with throw ratio of 0.25:1 to go with a Natvis curved screen . The projection was terrible with this setup. I sent the gt5500+ back and went with 1080gt darbee versions with the longer throw ratio as the setup was originally designed for. I thought going with the ultra short throw would create a 210 degree visual system no problems, Instead I ended up with a view that was unworkable due to an over exaggerated bow of the image from each projector.

The red outline indicates the view when using the ultra short throw. As you can see, the keystone was uncorrectable even at max settings.
The gt5500+ uses a reverse mirror to project at such a short distance, as does the Xiaomi Mijia 4k ultra short throw. I'm sure the result would be the same just at a much better resolution.
Thanks Hoppie for adding the pic.