Projector Reviews

Viewsonic PJD-7835HD Projector Review – Performance

PJD-7835 PROJECTOR REVIEW – PERFORMANCE:  Brightness, Sharpness, Audible Noise, Image Noise

PJD-7835HD Brightness

Overall brightness of this projector is impressive.  There are two “brightest” modes (one which they actually call Brightest Mode, the other is Dynamic).  Both produce tons of lumens, but neither has great color. Still what they do pump out is fine for most presentations, or collaborations where color isn’t critical.

When better, more accurate color is needed, that’s where the other three modes come into play, they do better reds and yellows than the brighter modes.  2000 lumens is still a healthy amount – way back “in the old days.”

Yep, 12-15 years ago, 2000 lumen projectors were what companies used for small auditoriums and hotel ballrooms (lights down or out).

VIEWSONIC PJD-7835HD Brightness in White Lumens @ wide angle
Mode/Setting Lumens
 Dynamic  3510
Brightest  3876
Standard  1330
 Movie  2067
ViewMatch  1598

Note: These measurements were taken with the zoom lens at wide-angle end of its range (largest image). Being a 1.36:1 zoom the effect of the lens’es position is relatively limited.

A quick measurement showed full wide angle being almost exactly 5% brighter than if we had measured at mid-zoom which we always do for lenses with 1.5:1 zooms or longer.  We use mid-zoom on the longer zoom ratio lenses because there can be a 20%+ drop from wide angle to telephoto.  In fact on 2:1 zooms that drop can approach 40% – which, of course is very significant.

The bottom line in brightness is that the PJD-7835HD exceeded it’s claimed brightness by very close to 10%. Good for the PJD-7835HD!

Again, we measure only white lumens.  On a single chip DLP we expect significantly lower color lumens.  The images of the different color modes support that (with the dark (pure) reds in particular, on the Dynamic and Brightest modes. For those who want to learn more regarding the whole color lumens aspect we created a video.

Multiple Lamp Modes

Effect of Lamp Mode on Brightness
Dynamic 3876 lumens
Normal 3902 lumens
Eco 2814 lumens
Super-Eco 2160 – 970 lumens*

As you can see from the chart above, there is about a 28% drop in brightness between Normal (which measured brighter than Dynamic), and Eco mode.  That kind of drop is fairly typical (25-35%), and should be the same across all modes

The Super-Eco mode however brings about a total drop of about 45%.

*The even lower brightness number on the chart – 970 lumens, is the measurement I got after leaving the test image up static for about a 10 minute period of time.  The projector, in Super-Eco, seeing a static image, slowly dims it after a while,  to save energy.  (Not an uncommon feature on projectors these days.)

The possible limitation of Super-Eco mode, on this projector is that the lamp does softly flicker, rather than holding steady.  Lamp flicker is nothing new, and when it does show up, it has traditionally been seen in low power /eco modes, rather than full power modes.  The good news is that the standard Eco mode showed no flicker at all.  I guess that the flicker should be anticipated when running the lamp at barely half of it’s designed  full brightness?

PJD-7835HD Sharpness

The good news is the higher the resolution the projector, the easier it is to read the smallest type sizes, and to resolve more detail.  The downside is that on low cost projectors, the optics aren’t as good as on far more expensive ones.  As a result, projectors like the Viewsonic could have sharper lenses.  No surprise there.

Overall sharpness is very good, definitely not exceptional, despite being a single chip DLP.  I point the blame finger to the low cost lens.  Still, if you look at the images here, even the really small type – 8 point – is just readable, but remember, that’s 8 point type at 1920×1080, so that type is barely half the size (1/4 the area) of the same 8 point character displayed on an XGA projector!

As you can see, you can easily read the type on web pages, and formal documents of all types, and that’s what we’re looking for.

Edge to edge sharpness was pretty good, if you focus dead center, there’s just a little softness in the corners.  Ideally you’ll want to focus this (and most projectors) so that they are at their sharpest about 1/3 out from the center, for best overall sharpness.  No sign of defocusing as the projector warms up.

Bottom line on sharpness:  Pretty typical for sub $1000 projectors.  No complaints.  Edge to edge sharpness a little better than most competitors.  Readability of small type on normal documents in not a problem (as long, of course as you aren’t viewing from too far away).

Audible Noise

The PJD-7835HD is a bit noisy.  Even in Eco and Super-Eco the fan never really gets pretty quiet.  Eco and Super-Eco audible noise is still likely just about 30 db.  At full power the Viewsonic fan gets louder, but not dramatically so.  I would say that many competitors are a touch noisier in full power, and a touch quieter in low power modes.  The fan noise is a little higher pitched than some, but not in a range that’s annoying.

Even when the fan is at its loudest you won’t have to shout to talk over this Viewsonic projector, but you likely will be raising your voice slightly.

Overall the fan tends to hold steady regardless of the mode.  That’s better, I think than some projectors which are constantly speeding up and lowering the fan speed to keep the projector running at proper temperature.  Better a steady level than a changing one, which is more distracting.

Image Noise

No complaints to report about image noise.  Standard mosquito background noise is evident, but isn’t quite as noticeable as on many single chip DLP projectors.  As a group, this type of noise is more evident than on projectors using other technology (that would only be 3LCD technology in sub $2000 projectors, as LCoS projectors start a good bit more expensive.

No obvious motion artifacts when viewing movies.  The Viewsonic does a good job of handling slow pans.

All considered, no image noise issues.  Performance on the Silicon Optix disc came out fine with no fails on any of the tests I run.