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Amazon.com: [Electric Focus] Projector with WiFi and Bluetooth, 6D/4P Keystone 15000L VISSPL 5G Native 1080P Projector 4K Support, 50% Zoom Outdoor Movie Projector for iOS & Android Phone, Laptop, HDMI,USB,TV Box :
![Projection setup and keystone effects: (a) requires long projection... | Download Scientific Diagram Projection setup and keystone effects: (a) requires long projection... | Download Scientific Diagram](https://www.researchgate.net/publication/225238306/figure/fig4/AS:302700471308291@1449180824847/Projection-setup-and-keystone-effects-a-requires-long-projection-distance-b-by-using.png)
Projection setup and keystone effects: (a) requires long projection... | Download Scientific Diagram
![texturing - Correcting perspective distortion for an angled projector ( Keystone effect) - Blender Stack Exchange texturing - Correcting perspective distortion for an angled projector ( Keystone effect) - Blender Stack Exchange](https://i.stack.imgur.com/82QsG.png)