Portable LED Projector
December 16, 2013
Setting up the Projector
Good Connectivity. The ML550's back panel offers just a few connectors, but they're all you need.
- 1 HDMI, MHL enabled, so it can work with, for example, a Roku stick for streaming video.
- 1 proprietary I/O port paired with an adaptor that plugs into the port on one end and combines a 42" cable ending in a VGA connector for a computer with a 6" cable ending in a female mini-jack for audio output.
- 1 MicroSD card slot
- 1 USB A (For a USB memory key, a $99 optional Wi-Fi dongle, or direct connection to a PC to upload files to memory. Free Wi-Fi apps are available for Windows, Mac, iOS, and Android OSs.)
Setting up. One minor setup issue is that if you want to show files directly from the projector's 1.5GB internal memory, you need a USB A to USB A cable to transfer the files. Optoma doesn't include one, however, so you need to buy one separately if you want to take advantage of the feature. You may also want to get the optional $20 tripod or $99 Wi-Fi dongle.
The vertical offset for the ML550 lines up the bottom of the image with the center of the lens. This is ideal if you're using a table-top screen on the same table as the projector. If you need to adjust the image position and don't have the tripod, however, you can either use the screw adjustment on the projector's front foot to raise the image, or simply rest the front or back of the projector on something to change the image height. You can then square off the image with the manual keystone control.
Setup is otherwise simple, with the focus tab offering just enough resistance for sure control. There's no zoom, however, so you have to move the projector to adjust image size. For an extended session in moderate ambient light, I settled on a 48" diagonal image, with the projector just over 6' from the screen.
As with any projector this light, the ML550 tends to pivot if there's any tension on the cables plugged into it. I usually solve that problem for testing by taping the cable down. However, putting something on the cable, like a paper weight, works just as well.
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