Projector Lens
 |
 NEC LCD HOME THEATER BUSINESS VIDEO PROJECTOR PC MAC  US $94.00
|
 The Sharper Image - Movie/Video Game Projector EC-PJ10 US $39.49
|
 SHARP Notevision 5 LCD projector XG-NV5XB w/o lamp US $39.00
|
 SHARPER IMAGE EC-PJ10-CA MOVIE AND VIDEO GAME PROJECTOR US $69.99
|
 SUPER BRIGHT MITSUBISHI HC100 DLP PROJECTOR US $275.00
|
 HDMI 1080i HD Projector for Home Theater DVD TV Wii PS3 US $399.99
|
 NEW HD 1080i Projector HDMI for Home Theater DVD TV Wii US $147.50
|
 PANASONIC PT-LM2U HD HOME THEATER / COMPUTER PROJECTOR US $230.00
|
 Hitachi EDPJ32 Projector US $414.11
|
 Panasonic PT-AX100U LCD Projector Slightly Used VGC US $755.00
|
 HDMI 1080i HD LCD Projector for DVD TV Wii Xbox 360 PS3 US $399.99
|
 INFOCUS X2 DLP HD HOME THEATER / COMPUTER PROJECTOR US $224.72
|
 Nice VIEWSONIC PJ501 3LCD Projector w/Manual & Case LCD US $127.50
|
 Sony VPL-PX10 LCD Projector US $35.00
|
 PANASONIC PT-LM2U MINI HD THEATER / COMPUTER PROJECTOR US $203.50
|
 DIGITAL MULTIMEDIA PROJECTOR 120" SCREEN. NEW IN BOX US $49.99
|
 PROXIMA DP6860 HD HOME THEATER / COMPUTER PROJECTOR US $202.50
|
 (((( Panasonic PT-AX200U LCD Projector )))) US $430.00
|
 NEC MT1060R HD HOME THEATER / COMPUTER PROJECTOR US $152.50
|
 InFocus X1 DLP Projector - only 280 hours + Mount! US $192.50
|
 1080i HD/HDMI LCD HOME THEATER PROJECTOR +2 Free Bulbs US $420.00
|
 Viewsonic PJ503D DLP Projector 1500 Lumens US $289.99
|
 New DG-737 HD Video Game Movie LCD Projector 4 DVD Wii US $152.51
|
 175" Projector Big Screen LCD TV Enlargement Kit US $14.97
|
 New DG-737 HD Video Game LCD Projector 4 Home Theater US $150.00
|
 INFOCUS LP850 VIDEO PROJECTOR 4500 LUMENS, THREE LENS US $3,900.00
|
 New HD 1080i video Projector 4 Home Cinema DVD TV Wii US $102.50
|
 Epson EMP-TW1000 1080p LCD Theater Projector US $700.00
|
 Epson 8300NL 8300 Projector Lamp Bulb ELPLP23 320W US $89.99
|
 NEC MT1060 MT1060R MT1065 Projector Lamp Bulb 275W NSH US $49.99
|
 Philips DLP LCD Projector Lamp Bulb 120W UHP US $79.99
|
 TOP Philips LCD DLP Projector Lamp Bulb 132W UHP US $89.99
|
 InFocus X1 DLP Projector (Ceiling Mount Included!) US $600.00
|
 Luxeon V1 Digital Zoom Projector US $1,000.00
|
 Sony VPH-D50 CRT video projector- 1080i US $900.00
|
 Sony VPH G90 CRT video projector HDTV 1080p! US $4,500.00
|
 VDC/Electrohome 9500 Ultra CRT video projector 1080p! US $7,500.00
|
 Runco 1101 9" CRT video projector 1080p US $3,800.00
|
 AmPro 4600 HDTV CRT projector 1080p! US $2,500.00
|
 NEW HD 1080i PROJECTOR HDMI FOR HOME THEATER DVD TV Wii US $199.99
|
Projector Lens
Lens shift, or image offset, can be defined as the ability to shift a projected image vertically or horizontally in order to accommodate specific installation challenges. In most installations, lens shift can be used to optimize image geometry and scaling performance by optically landing the image on the screen without having to tilt the projector and employ keystone correction. It can also be used to position the projector such that the average viewer is placed in the illumination sweet spot – an especially important consideration in rear screen and high gain front screen applications.
Within Digital Projection's current product lineup, the only projectors that do not offer lens shift are the iVision 30 series products. These projectors are designed to mount in a specific position with respect to the top or bottom of the screen.
With the benefit of lens shift, our other displays can be located within a much wider area of the screen. This area is usually defined as a percentage of the image (or screen) height or width. With lens shift centered, dVision, Mercury, TITAN, HIGHlite, LIGHTNING and Reference displays are designed to be installed on-axis with respect to the screen. The lens employed in the application defines the amount of total lens shift available, from that on-axis position.
Zoom lenses generally offer the most lens shift - up to 50% of the image height (vertical) and up to 25% of the image width (horizontal). Short throw fixed lenses generally offer more limited lens shift – approx 10% of the image height and little or no horizontal shift. Fixed short throw lenses are most often utilized for on–axis rear screen applications.
As an example, when using a typical zoom lens with a TITAN HD projector on a screen that is 60” high, the installer would have as much as 50% vertical lens shift (offset), or 30 inches of up and down image movement from the screen center. This allows the projector to be installed anywhere from the top of the screen to the bottom of the screen. Given a 16 x 9 aspect ratio, the same 60” high screen is nearly 107” wide. The same zoom lens would offer 10% of that screen width in horizontal lens shift (horizontal offset), or nearly 11 inches of image shift left and right.
It is important to remember, if both horizontal and vertical lens shift are employed, the total available lens shift in either dimension will normally be less than the maximum specified for the lens.
Although lens shift provides great flexibility in projector placement, be aware that in any installation, the goal should be to install the projector to assure maximum transfer of illumination from the projector to the average viewer position. This makes the most of screen gain and optimizes luminance uniformity, peak brightness, contrast and also minimizes hot spotting. Projector placement is especially critical in rear-screen applications, as well as in front screen applications where high gain screens are utilized.
About the Author:
A digital imaging pioneer and projector industry leader, Digital Projection International (DPI) manufactures and distributes an extensive and expanding line of ultra high-performance 3-chip and single-chip DLP® projection systems. These projectors are the reference standard for demanding applications such as large-venue, live-event staging, Fortune 5000, homeland security, education, medical and scientific research, command and control, digital cinema, commercial entertainment, worship and elite home theater.
Multiple company accolades include two Emmy® Awards for Outstanding Achievement in Engineering Development by the Academy of Television Arts and Sciences. DPI remains the first and only projector manufacturer to win the coveted award.
Article Source: ArticlesBase.com - Projector Lens Shift and the Projector Sweet Spot -- A Quick Summary for digital projectors