Not logged in
 
Author
Topic: Short Throw Questions
member
Joined: Jan 30, 2016
Posts: 1
Reply to PostAlert Moderator
My conference room with control lighting in the front of screen. The room dimension is 24' x 24' with a 133" diagonal Da-Lite / Da-Mat finish tensioned pretty much dead center with white tiles and off white walls. I am looking at either EH200ST or EH415ST. The room will be used in a mixture of video/presentations. I need a throw below 5' and less is better. When I use the projection calculator on the EH200ST it goes into the red for ambient light (worst on the 415) and the brightness in ft is 57 on presentation and 29 on video. Would these projectors be acceptable in room like this producing a high quality image without be washed out? I have tried an NEC NP-M353WS and you can see black grids (like you are looking through a screen door) and not very sharp at 6-10 feet from the screen. I am open to other projectors options and higher in pricing if needed.
moderator
Joined: Mar 28, 2005
Posts: 12,536
Reply to PostAlert Moderator
The problem is that all of these models are really on the 'cheap' side of things. Presentation projectors ideal for a college classroom or a K-12 classroom, but only so-so in overall quality. That's a reality of most sub-$2,000 projectors.

They are using good DLP chips, so with 1920x1080 or 1920x1200 resolution, and a good presentation source, you should have a sharp image free of the screen door effect (SDE) (that's what it actually is called!).

Lower resolution projectors and really cheap stuff can be bad with SDE. The 1280x800 resolution projectors at 133" would typically have more SDE.

Anyway, you do have to consider that the projector you tried before was rated at 3,500 lumens. You want to consider the focus quality and the overall image quality to be similar to what you will get from any projector in this price class. The resolution will be better, and the image will be sharper, but you MUST place the projector exactly where it must go, and you must not use any keystone correction at all.

Short throw projectors, due to the severe projection angle, are MUCH more picky about placement, and much more susceptible to image degradation due to the quality of their optics.

Basically, a long/standard throw projector will almost always produce a better quality image because the optics aren't as demanding. If your screen has any flaws/issues/wrinkles/waves, etc. it will hurt image quality.

While I try to avoid short throw projectors, they are sometimes needed. I don't have an extensive list of short throw models to use, since I try to avoid them. Panasonic has an EXTREMELY good short throw lens, which goes on their better projectors, but expect $3,000+ for just the lens, then $5,000+ for the projector. So, that's quite a price differential.

Brightness, overall, is seriously impacted by the fact that it is a DLP projector, typically with a 2x color wheel. So, while it may be able to deliver 3,500 peak white lumens, it looks dull with colors, and only can likely deliver about 1,500 or less color lumens. That's quite a difference.

LCD doesn't offer any high resolution short throw models other than the expensive Panasonics.

Canon has their short throw LCoS model which should be considerably brighter, especially with colors...
http://www.projectorcentral.com/Canon-REALiS_WUX400ST_D.htm

That's 1920x1200, and should look great.

Otherwise, you drop into a very short list of bright 1920x1080 models which have very similar specifications...
http://www.projectorcentral.com/projectors.cfm?g=1&hide=0&st=1&mfg=&p=500&p=12000&w=&r=13&br=3400&br=50000&ll=<g=&t=&db=&dt=&c=&ar=Wide+%2816%3A9-10%29&dvi=&wr=&sp=14&pjl=&pjw=&pjh=&td=&is=&i=d&tr=&oop=1&sort=brt&sz=15

Without spending a fair bit of cash, it's hard to get upgrades in this category because it is outside the 'normal' projection setup for most people.
[Edited by AV_Integrated on Jan 30, 2016 at 9:09 AM]
AV Integrated - Theater, whole house audio, and technology consultation during the build and installation process in the Washington, DC metropolitan area.