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Normal vs. High-Speed Auto Iris in Epson Projectors

Auto Iris in Epson projector

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Epson projectors can be used for a wide range of scenarios, from academic to business to watching a movie in your backyard. 

When setting up an Epson projector, there will be certain settings you need to adjust to account for environmental factors like lighting, as well as any qualities in the content that may require it. 

Epson projectors allow for this control through a feature called the auto iris, which can be run at a normal speed and high-speed mode. 

Depending on your needs, both of these speeds have benefits. 

This article will break down Epson auto iris normal vs high speed to figure out which setting is right for you.

What is Auto Iris? 

Auto Iris refers to a lens that is on your camera or projector which can be opened and closed as a mechanism for controlling the amount of light entering the imaging sensor. 

These adjustments can help balance the exposure and allow your device to properly create high-quality images. 

Auto Iris is a particularly desirable functionality when using a projector outdoors, as it can respond as the sun shifts and light conditions change rapidly. 

There are two kinds of Auto Iris lenses, both of which are motorized with different control centers. 

A DC-Iris has the motor control in the camera, while a Video Iris will have the control in the lens itself. 

In an Epson projector, the Auto Iris will open and close depending upon the brightness of the projected image, changing the amount of light emanating from the projector. 

When an image is darker, the iris opens to allow more light; if the image is bright, the iris closes to contain the light. 

What is High-Speed Auto Iris? 

The Auto Iris in an Epson projector will be configured to perform these brightness adjustments at an average speed out of the box. 

However, some people choose to change this setting and use a high-speed version of the Auto Iris. 

When enabled, this setting adjusts the brightness as soon as a scene changes, all at once rather than gradually.  

This shift is usually not noticeable, but if a very dark scene suddenly switches to a very bright scene, the user may perceive the quick change as it happens. 

Should I Use Auto Iris?

Epson Home Cinema 1080 3-chip 3LCD 1080p Projector

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In addition to normal and high-speed settings, Auto Iris can also be turned off entirely. 

Some people choose to do this because they are bothered by changing brightness when they can notice it. 

That said, Auto Iris is an important functionality that is generally recommended for use, especially if you may be in an environment where light levels change or showing varying videos. 

It is a common misconception that color is the most important element of producing good images, when in fact it is a combination of factors, including color. 

Brightness is also one of these critical elements.

Some Epson projectors will work best with certain settings. For example, it is recommended that when the Epson 1060 projector is used, Auto Iris is turned off.

How to Adjust Auto Iris 

Epson Home Cinema 1060 Full HD 1080p

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When setting up your Epson projector, you will be able to control the type of Auto Iris used and whether it is on or not. 

To do so, you’ll first choose the proper image source on your projector and then navigate to the Menu. 

There will be a section for Image that has an Auto Iris option, where you can choose between normal and high speed or turn the function off altogether. 

You can also set Auto Iris for each Color Mode independently. However, you cannot change the Auto Iris setting if you are taking advantage of closed captioning.  

To do this, you will choose Lens Iris under the Image menu. You can use the left and right arrow buttons on the remote control to adjust the iris lens. 

Reducing the value here will increase the intensity of colors in your image. The default values will correspond to your chosen Color Mode and the position of the zoom lens.

You can also choose certain modes for 3D images which may render differently.

How Auto Iris Works 

Auto Iris in projector

The goal of Auto Iris is always to boost the contrast in projected images, ensuring they have the proper amount of light to produce quality images. 

In many cases, the mechanism they use is similar to that of a leaf shutter on a camera- the blades move across the lens to adjust the size of the iris, producing the highest possible quality in an image. 

Other versions may be more wheel-like, with an aperture that shrinks and rotates gradually to adjust the opening and boost contrast. 

These both lead to an image with the necessary amount of brightness and darkness to convey its intended effect. 

When using an Epson projector, you will be operating in a particular color mode. Each color mode is designed for use in certain environments. 

For example, theatre mode is made for videos being projected into dark rooms, while photo mode is for still images being shown in a dark room. 

Certain color modes may limit your options for the speed of Auto Iris.

Epson Auto Iris Normal vs High Speed

Normal High Speed
Standard brightness adjustment  Adjusts brightness as soon as a scene changes 
Less visually obvious   Can be noticeable 
Available in all Epson projectors Available in all Epson projectors


When considering the Epson Auto Iris normal vs high-speed setting, your decision may come down to how you are using your projector and how you want your images to appear. 

High speed may be best for movies, where you will experience sudden shifts in brightness, while normal is sufficient for a slide show or more stagnant presentation. 

Because both are options within the settings menu, it is simple to toggle between both choices and determine the one that gives you the highest quality viewing experience. 

The ultimate choice of whether to use normal or high-speed settings will come down to the material you are viewing and personal preference.

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