AVS Forum banner

Status
Not open for further replies.
1 - 6 of 6 Posts

·
Registered
Joined
·
462 Posts
Discussion Starter · #1 ·
What is genrally the optimal distance for overall PQ and contast - at the minimum end of a DLP projectors range or the maximum (assuming a good quality screen and dark viewing conditions)?
 

·
Registered
Joined
·
475 Posts
In the past, Don Stewart (of Stewart Screens) noted that it is best to put the projector as far from the screen as the zoom allows. This renders the best color and light uniformity across the screen. Others have noted a slight increase in brightness by placing the projector closer.
 

·
Registered
Joined
·
761 Posts
Quote:
Originally posted by toddalin
In the past, Don Stewart (of Stewart Screens) noted that it is best to put the projector as far from the screen as the zoom allows. This renders the best color and light uniformity across the screen.
That doesn't make sense. That's like saying the music sounds better with all the sliders at the top on your equalizer. At the middle of the focal range the optics of any lens are neutral (they are ground for this particular spec.) and everything else is less than optimal.
 

·
Registered
Joined
·
13,049 Posts
I know some of the advise here sounds counter-intuitive, but in addition to the above I've also heard from reliable sources that mounting towards the max throw also helps increase constrast. Also for example Bob Williams with InFocus recommends mounting the 7200 at the max throw.
 

·
Wireless member
Joined
·
27,116 Posts
Quote:
Originally posted by blitzkreig
That doesn't make sense. That's like saying the music sounds better with all the sliders at the top on your equalizer. At the middle of the focal range the optics of any lens are neutral (they are ground for this particular spec.) and everything else is less than optimal.
Isn't the way to achieve maximum light passing through the "middle" of the lens to have the PJ at it's max distance?
 

·
Registered
Joined
·
121 Posts
This has more to do with the screen than anything else. At shorter throw distances, the angle the light hits the screen is greater for the outer edges. At the longest throw, you are minimizing these angles, and staying closer to the screens optimal performance range. For some screens it probably doesn't matter as they are more uniform over a broad range.


Chris
 
1 - 6 of 6 Posts
Status
Not open for further replies.
Top