Projector Reviews

BenQ HT1075 Projector Review – Performance

BENQ HT1075 PROJECTOR – PERFORMANCE Page 1:  Brightness of Pre-set Color and, Eco Mode, Affect of Zoom lens on Brightness, Calibrated Brightness, Gamma

Brightness by Mode, Color Temp of White (100 IRE)
Mode Lumens Color Temp
Bright 2446 7458
Standard 2079 6866
Cinema 2049 6732
Cinema in Eco 1284
User 1 2079 6856
User 2 2079 6854

Brightness is measured with zoom at mid-point.  When comparing to the brightness of projectors done prior to 2014, including the older BenQ W1500, and W0170, metering equipment and calibration software have changed.  Current equipment measures approximately 10% brighter than Mike’s older setup.

As you can see from the table, Bright mode is the coolest, but it’s more notable for its strong green and yellows than the cooler overall temp.

All the other modes offered up very good grayscale.

Note that Eco mode measured approximately 37% lower, which is surprising as Optoma actually states that eco mode is 30% less bright.

User 1 (and User 2, not shown), have the same measurements, and those are pre-calibration.  Note please, that the measurements are essentially identical (well within the margin of measuring error) of the measurements for the Standard mode.

User modes, like Standard, are slightly thin on reds.

Color Temp, Cinema, Pre-Calibration

Color Temp across brightness range – Cinema Mode
IRE (Brightness) Color Temp
100 6732
80 6729
50 6734
30 6687

Not much to see in this table.  We don’t report as many IRE points on pre-calibration data, as we do on post, but from the four points from white to medium dark gray, they all measure very close to each other – in fact within 50K, which is very tight.  (There is more shift in the much darker regions).

If the overall color temp for these brightness levels were just 200K lower, they would be close to perfect, at least as far as grayscale balance goes, and they would put back in that little bit of missing reds.

Between Standard mode, and Cinema mode, the brightnesses measured within 2% of each other.

Without adjustment, Cinema will, for most critical viewers,  be the preferred mode compared to Standard, but both are very good. Standard seems to have a touch more punch, so for something like sports with some ambient light present, you may favor Standard.

Even our calibration settings, found in the calibration pages, result in only minor adjustments compared to the default.

Only Bright mode has color balance issues that are of significance.  Figure to use Bright only when you are fighting a lot of ambient light, because the Bright mode with its strong yellow-greens is not very pretty, but it will get the job done when every last lumen is needed!

Affect of Zoom Lens on Brightness

Affect of Zoom Position on Brightness, Bright Mode
Zoom Lumens
Wide angle (zoom out) 2554
Mid-zoom 2446
Telephoto (zoom in) 2331

 

With only a 1.3:1 zoom lens range, we don’t expect to see a significant drop off of brightness between placing the projector at its closest possible distance to a given sized screen, and placing it at the furthest possible distance from that same screen.

The measured results confirm that.

In the closest position, the projector measured 2554 lumens in Bright mode – not pretty, but that is a lot of lumens!  On the other hand, if you place the projector at its maximum distance, about 30% further back, you only lose about 220 lumens, or less than 10%.

In other words, where you choose to place the projector – for example when ceiling mounting, should be based on what’s easiest to do, rather than trying to save a few extra lumens of brightness.

The same applies when setting up on a table top.   Thus, you would place the projector where most convenient – so it’s not blowing hot air on one of the folks watching it, or not being too close from a standpoint of the projector’s fan noise.

HT1075 Best Mode Color Temperature - Post Calibration

Color Temp across brightness range – Cinema Mode
IRE (Brightness) Color Temp
100 6603
90 6496
80 6522
70 6512
60 6522
50 6471
40 6524
30 6476
20 6574

From White to dark gray (20 IRE), the HT1075 produces a very tight, color temp range, varying by less than 150K!  That’s about as good as the numbers get.  More to the point, the balance between red, green and blue is excellent.  The only range with enough deviation to mention would be white (100 IRE, which is still just a tad thin on reds, and a tad strong on greens, and 20 IRE – as far down as we measure, where there’s just slightly too much blue.

But I’m really quibbling.  All considered few projectors at several times the price would calibrate any better.

HT1075 Gamma

Like everything else about the default settings of the BenQ HT1075 projector, default gamma is extremely good.  The target range is 2.2, and this projector managed to run the range from dark 20 IRE to white, while staying between 2.12 and 2.27, for an average, per Mike of 2.18.  The Gamma curve you see here, climbs for brighter images.  Overall, that represents a slight tilting, but, if you must have variation, it’s probably a very good way to be “off.”

Consider that in the brightest areas things will be a touch less bright than perfect, which is fine.  In the darker areas, things will be a touch brighter than ideal, but that will help reveal dark shadow detail, etc.

Nicely done!

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