AVS Forum banner
1 - 9 of 9 Posts

·
Registered
Joined
·
277 Posts
Discussion Starter · #1 ·
Never been clear about this. Is ZOOMed when you make the display larger (wider angle) or is it the opposite like a zoom lens on a camera? (narrower field of view but magnified)
 

·
Registered
Joined
·
4,738 Posts
Both


Zoom out - wider

Zoom in - smaller for longer throws
 

·
Registered
Joined
·
4,738 Posts
Lightout put is not reduced by zoom, it is spread out over a larger or smaller area making the brightness slightly less or more


1.5:1 means the zoom can make the image 50% larger to 50% smaller than the image size in the middle of the range.
 

·
Registered
Joined
·
1,212 Posts

Quote:
Originally Posted by reconlabtech /forum/post/15571837


Lightout put is not reduced by zoom, it is spread out over a larger or smaller area making the brightness slightly less or more


1.5:1 means the zoom can make the image 50% larger to 50% smaller than the image size in the middle of the range.

Its actually been discussed that lumen output is in fact reduced in the lens assemblies telescopic mode, but provides better sharpness compared to the wide-angle mode for cheaper optics. Though i don't know their sources, just relaying the info.


To answer the op's question, zoom, in the optics sense is there only to increase the size of the projector image. It effectively moves the first focusing lens closer to the dmd/optical prism (for 3-lcd) internally. This can lead to chromatic aberrations and focus problems though. The better the optics the less these effects are apparent. Its actually best for the zoom to be in the middle, if you want the best quality image.
 

·
Registered
Joined
·
277 Posts
Discussion Starter · #8 ·
oh wait... 50% larger OR smaller than the middle of the range? So twice as big total from tele to wide?
 

·
Registered
Joined
·
1,212 Posts

Quote:
Originally Posted by BNW /forum/post/15571973


oh wait... 50% larger OR smaller than the middle of the range? So twice as big total from tele to wide?

I think it means + or - 50% from the middle.
 
1 - 9 of 9 Posts
Top