Stuck or twinkling pixels on the projected image may be due to a defective DMD chip. These pixels can show up as bright, dark or twinkling points. They look similar to pixel defects on LCD displays. This cannot be fixed by the end user and must be sent in for service. Contact ViewSonic Customer Care to verify if your unit qualifies for warrant...
Each product has its own list of compatible video, audio and image formats. The best way to know what file type is specifically supported by your product is to look in the user guide for your particular model.
Or browse to your projector model in the Projector Accessories section of the ViewSonic Store. If a Long Throw lens is available for your projector, it will be listed on the online store. Note: A Long Throw Lens is not available for all ViewSonic projectors. To check availability, or to purchase a long throw lens, please contact ViewSonic...
Please refer to user guide on page "Important Safety Instructions". Some projectors may be claimed to use at a limited angle dependent on the light source, such as lamp or LED.