What is Lens Memory and how is it used?
Lens Memory is a feature added to the Reference Series line-up in 2012 beginning with the DLA-RS45, DLA-RS48, DLA-RS55, and DLA-RS65. It is also featured on the 2013 line-up, DLA-RS46, DLA-RS4810, DLA-RS56 and DLA-RS66.
Most people use the Lens Memory feature as an alternative to using an external anamorphic lens for widescreen movies. As the name suggests, Lens Memory lets you set up the image size, position (by lens shift), and focus of the projector lens and then store those settings in memory so they can be recalled later. Setting up for widescreen is fairly straight forward. Naturally, this would require the use of a widescreen formatted screen (2.35:1 or 2:40:1 aspect ratio). All you need to do is adjust the projector lens to zoom, position (lens shift), and focus the widescreen formatted movie to fill your 2.35:1 screen, and then store that setting into memory. You can name this memory setting anything you want. Next, change your video to a 16:9 source and then readjust the lens zoom and shift (image position) so the image fills the screen from top to bottom and is centered horizontally (don’t readjust focus – see tips below). Store that setting into memory and name it. Now you can use the remote control, or discrete command codes, to recall your stored settings for 16:9 HD and widescreen 2.35:1 image sizes. You might also want to set up a third lens memory setting for widescreen movies that use closed captioning, which is sometimes located in the black bar at the bottom of the letterboxed image.
- We recommended that lens focus be adjusted and saved only when setting up the first memory. Do not try to touch up focus for the second or third memory settings. The focus motor is not precise enough to return to the exact position that was stored each time. If you properly set focus only once during the first memory setting it will stay sharp for both 16:9 and 2.35:1 image sizes.
- The normal 1.4:1 – 2.8:1 throw distance range will be limited when using lens memory for both 16:9 and 2.35:1 formats. See the separate FAQ on this topic for more information.
- By default, the projector displays the green alignment grid to assist with setting up lens memory. The grid can be turned off by turning OFF the “Image Pattern” in the Lens Control menu of the projector. Most people prefer to see the video source, not the grid, while the projector transitions from one lens memory to another.
- If your projector automatically pops up a menu at the end of a lens memory recall asking if you want to re-adjust the lens settings, it can be eliminated with a firmware upgrade. Go to http://pro.jvc.com/update to locate the firmware upgrades for your projector model.
Last update: 2013-05-28 11:59
Author: Ken Bylsma