Casio XJ-A250 Mobile Projector
Brightness and Uniformity: Our sample XJ-A250 missed its brightness rating of 3,000 lumens by a wide margin. The highest brightness we could achieve was in Eco Off mode set to Bright and Color Balance set to Normal. Still, the reading was only 1,850 lumens after 15 minutes of warm up time. Immediately after power-on, the lumen reading was as high as 2200, but there was a 16% drop in brightness within the first 15 minutes of operation. Typically, projectors with UHP lamps get incrementally brighter as they warm up to a stable operating temperature, but this one dims down somewhat.
Unlike most projectors, the XJ-A250 has three brightness settings: Eco Off, Eco, and Save. However, the Theater, Game, and other preset modes can only be selected in Eco or Save mode, not when the XJ-A250 is at its brightest. In Eco mode, the Standard preset put up 1,300 lumens, Theater and Graphics both delivered 970 lumens, and Game mode came in at 1,035 lumens. With Eco Off mode, you can choose between two brightness levels (Normal and Bright), but remember that presets are not available at these settings. Save mode dropped brightness levels by 33% from Eco mode (to 880 lumens), and fan noise all but disappeared.
Light Loss after Keystone. All projectors lose some light and resolution when keystone adjustments are used to square up an image, simply because a portion of the imaging chip is turned off to create the effect. If you plan to use this projector in a mobile fashion and place it on a conference table, tilting it up and using the auto keystone will be the normal mode of operation. When uptilted and keystone corrected, the unit loses about 20% of the light it would otherwise deliver. In other words, the 1850 lumens one gets in its brightest mode drops to about 1500.
Image Quality: Data images from the XJ-A250 were sharp from edge to edge, but their color saturation was low and the images looked a little flat. Reducing brightness and raising contrast helped, but the images still lacked the pop one sees on competing models.
Saturation, tint, and sharpness adjustments were only available for composite video. Adjusting image color for signals other than composite video required using the RGB Color Balance sub-menu, and the impact on the image was subtle at best.
Another distraction most noticeable on computer data images was a green bias on the right edge of the image. This was prominent when the lens was set to wide angle, but disappeared when the lens was zoomed to its maximum telephoto position.
|Review Contents:||Overview||Advantages||Limitations||Limitations and Conclusion|