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The projector lens plays a vital role when it comes to the quality of a projector. What makes a projector better when comparing with other counterparts is nothing other than zoom ratio, throw distance and throw balance. Based on them, we can differentiate projector lenses depending on their quality.

Before going further, let’s have a short description of terminologies we are going to discuss below!

Throw ratio: Throw ratio is the ratio of a projection distance divided by the width of the screen. Most projectors have a zoom range like 1.0 to 2.0; while maintaining the projection distance, you can adjust the size of the image by zooming in and out, which changes the throw ratio.

Aspect Ratio: Aspect ratio is the proportion of width to height of the screen. The most common ratios are,

  • 4:3 Images, spreadsheets, and presentations
  • 16:10 Widescreen for presenting from business laptops
  • 16:9 Widescreen mainly for home entertainment


Why Should One Know About The Throw Ratio?

Knowing the value of the throw distance is worth sorting out how far the device will sit in your home theater, lair, lounge, room, or business meeting room. On top of that, it assists you with deciding the nature of your picture comparative with the throw. The throw ratio (TR) is determined by width (W) relative to the distance (D).

How To Calculate A Throw Ratio?

The throw ratio is a relation between the lens and image that includes the width of the picture. We generally use the following formula to calculate a throw ratio.

Throw Ratio = Throw Distance / Image Width

Throw Ratio notifies us what picture size we can project from a specific distance away. For example, a throw ratio of 1.5 indicates that for each 1 foot of picture width, the throw distance should be 1.5 feet. Thus, a smaller throw ratio means the more significant the projector’s picture will create from a shorter throw distance.

Using the equation for throw ratio is fundamental while choosing the right projector for your home or even for commercial purposes — consider the position of your projector and the size of the picture you’d prefer to project (or the size of the scene you’d choose to cover), apply throw ratio equation, and you will find the actual size.

Zoom Ratio!

Have you ever owned a camera or camcorder? If yes, you most likely could zoom in or out on the object you’re attempting to photo. The primary function of a zoom lens is to make the thing bigger or smaller without you moving. A projector’s long-range focal point is the same. It permits you to increment or decline the size of the extended picture without moving the projector. The most well-known zoom ratio among the present projectors is 1.2. With a 1.2 zoom ratio, you can change the picture size by 20% with a bit of adjustment in the zoom lens.

The scope of projector zoom ratio is pretty much as low as 0.4 and as high as 2.1; nonetheless, you can go lower and significantly higher by buying a projector that upholds optional lenses. Just like a professional DSLR, projectors with an optional zooming option can, for the most part, give answers to any unique need.

Why Zoom In Important for Projection?

So for what reason would you need to do that? There are a few reasons. In the first place, if you are using a portable projector, a long-range focal point is amazingly convenient for setting up in rooms where you have little power over the size of the screen. Second, a long-range zoom lens gives you more noteworthy adaptability to introduce the projector if you utilize it in a fixed setup. Lastly, if you choose to change to a more modest or more significant screen in a fixed setting, you have a sensible shot at rolling out this improvement without moving the projector.


The formula-driven from a throw ratio helps you in projecting your image to acquire perfect projection. Of course, you won’t be working in the same setting all the time, but this throw ratio formula will always give you an ideal output to enjoy and streamline movie nights at your backyard or patio. However, the zoom ratio allows you to correct the screen size to avoid big or small distortion in your screen. We hope that after reading this, you will have sufficient information to fix the throw ratio and zoom ratio.


Hi! We are team Jaytii. We love discovering new products and reviewing them to give you our 100% honest opinion. What do you think about this article? Let us know in the comments section below!