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Mobile Presentation
Optoma ML550 Projector Optoma ML550
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10000:1 Contrast Ratio
500 Lumens
PC 3D Ready
$479 Street Price
$799 MSRP

Optoma ML550
Portable LED Projector

Marc Davidson, December 16, 2013

The Viewing Experience

Like most projectors in its weight class, the ML550 uses a DLP chip designed to maximize brightness for small projectors. Unfortunately, it also adds apparent scaling artifacts. These are easiest to see as unwanted added patterns in large areas filled with repeating patterns of dots or fine lines. They can also give images a soft focus effect, making small text and fine details in line drawings hard to make out.

Similar artifacts show up with any DLP or LCD projector if you feed it an input signal that doesn't match it's native resolution. With the ML550, however, they show up even if you set your computer to 1280x800, so there's no way to avoid them. The good news is that you may not consider this a serious problem. Unless you use patterned fills in your graphics, you may never notice any artifacts. And if you don't need to show fine detail or small text in data images, you may not mind the soft focus effect either, although you'll likely notice that video and photos lose some crispness as well.

Data image quality. Although the apparent scaling artifacts and soft focus effect make the ML550 a poor choice for showing detailed line drawings or images with patterned fills, the projector did a credible job with the kind of images most people are more likely to use

Color balance was good, with various shades of gray acceptably neutral in most predefined image modes. Colors were suitably eye-catching in most modes as well, although they varied more from one mode to the next than with most projectors. Yellow, for example, was pastel, if not actually pale, in Bright mode; verging on lime green in PC mode; and definitively yellow in Cinema mode. You may want to pick a mode based on which colors you like best.

The ML550 also handled detail well enough for most purposes. White text on black was easily readable at 8 points, for example, and black text on white was easily readable at 9 points, with text breaking up at smaller sizes. Although that limits how much text you can put on screen at once and still be able to read it, it's easily good enough for images like a typical PowerPoint slide.

Video quality. Video is watchable with the ML550, but short of impressive as is typical for this class of projector. Predictably, the soft focus effect that grows from the DLP chip architecture makes the image look more like SD video than 720p HD. There are also issues with color. I settled on Cinema mode as the best choice for color quality overall, but even Cinema mode has some obvious problems. Most colors in most clips were a little washed out, but reds and blues in some clips stood out as oversaturated and shifted to the wrong hue, making them a little too vibrant.

On the plus side, the projector did an excellent job with shadow detail, and it showed only a hint of posterization in scenes that tend to cause that problem. It also handled skin tones well and showed minimal noise.

Other issues. Rainbow artifacts, with light areas breaking up into flashes of red, green, and blue, are less of a problem with the ML550 than with most DLP projectors, but still a potential issue. I saw few enough with data images and with most video that it's unlikely that anyone would be bothered by them. The one exception was a black and white movie clip, where the artifacts showed far more often. If you see these artifacts easily, you may well find them too annoying to watch black and white movies comfortably.

Another minor issue is that the projector's focus changes over about 10 or 15 minutes as it warms up. This can be a particular problem for business use, where you may start the presentation right after turning the projector on, and then have to adjust the focus two or three times, depending on how detailed your images are, before the focus settles into a steady state.

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Review Contents: Introduction The Viewing Experience Setup Key Features and Testing
  Limitations and Conclusion

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Comments (7) Post a Comment
Tony Posted Dec 17, 2013 10:54 AM PST
Why would you buy the ML550 when for $100 more you could buy the ML750?
frank Posted Dec 28, 2013 3:21 AM PST
price quotation and conditions of transportation
Jeff Posted Dec 30, 2013 5:33 AM PST
If the ML550 is the projector you are saying I am getting for $100 more than projector X to get 500 Lumen (and any of the other features) over the 300 or 400 lumen projector you were originally looking at.

You can keep saying well, this one is only $X more....
Nabi Posted Jan 10, 2014 5:30 PM PST
You've got to watch the claims of long LED lamp life. It's more than a bit of a scam: over time the lamp gets dimmer and dimmer. On my Acer unit a note popped up on the screen at around 2000 hours advising that it would no longer produce the light necessary for bright mode and suggesting lamp replacement. It was impossible to get hold of Acer to make my complaint. The performance of that projector is now increasingly wishy-washy so I'd suggest you view LED projectors as primarily good for portability particularly as more conventional projectors have lamps that last over 4000 hours now.
JD55555 Posted Feb 24, 2015 2:45 AM PST
Have a problem with my Optoma ML550. The projector work great when directly connected to different sources with HDMI - roku, HTPC, PS2, chromecast. However, when an HDMI switch is used, no video is displayed by the projector. A TV connected with the same cables, works perfectly. I've tried 3 different HDMI switches, including a powered J-Tech "matrix" one. I've swapped all the HDMI cables and tested with the projector AND the TV. TV works, projector doesn't.

It is not an HDCP issue - I've seen the "non-compliant hardware" warning from the roku connected to a computer monitor. That isn't it.

Swapping the HDMI cable to use another device is getting old.

Does anyone have an HDMI switch that actually works with the Optoma ML550 projector?
xxx Posted Nov 15, 2016 4:46 PM PST
Does anyone know if this projector reads subtitles files ( .srt)?? Thanks in advance
Ron Posted Nov 19, 2016 9:56 AM PST
These are cross-branded... ACER seems to be the originator - it's identical to the K series... in this case a K135. Acer spec's theirs at 600 lumens, but other than that, it's the same beat... different skin. Look at all of the physical aspects... connectors, card slot, IR sensor, cooling openings, lens, etc. I have the K132 which is why I recognized it.

It would be interesting to know who actually makes these... when I mod'd my Acer (to get direct audio output), I saw no names internally.

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