Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: Why does this lens body have a zoom rating? If it is only the lens then no optical zoom is applicable.
Document: I needed to upgrade from my &#34;film&#34; EOS Rebel to a digital Rebel. I chose the T3 because it's a Canon (no lens interchangeability issues. Going from digital to film there is an issue with the small zoom lens; the lens for the digital camera does not fit into the film camera body) and because it was extremely cost effective.
The quality and options provide the perfect balance for the beginner with a price tag that doesn't shock too much. While the casual point-and-shoot photographer accustomed to a good deal of optical zoom on their camera will have to adjust to switching lenses to get the right shots, the quality is unsurpassed and just some simple tricks make standard snapshots snap a bit more.
The only trouble I had was with finding compatible lenses. I bought a fisheye lens, but it would not go on the body of the Canon.
I bought the "body only" because I already had a bunch of Canon lenses  but there is nothing wrong with the "kit" lens if you buy the Rebel T3 "kit."
This camera is perfect for a step into the DSLR world. The great thing about getting just the body is that you can get a much better lens then the kit lens that usually comes with it.
First big girl camera and I absolutely love it. I ordered the body only so that I could order a larger lens with the money I saved. It is one of my favorite purchases to date.
I replaced my original Rebel body with the Rebel T3 and am very pleased with the extra features. It arrived in a timely manner. Was new as stated and in the original box which included everything but the 18-55mm lens which I already have. Have been having a great time getting to know the features of the camera.
The camera arrived a day early, and seems to work fine. The plastic bags holding the battery and charger had both been opened, which seemed odd, and the strap had been removed from its bag as well. The lens, as noted in the description, was removed. The upshot: A good deal, especially if you need just the camera body.
Purchased this camera body to save some money as I was told the kit lens was not worth using in the long haul. Several friends said, "Buy a body that works and save your money for a quality lens," so that's what we did. So far, the battery life has been good and the user interface has been easy to learn.
I'm new to DSLR cameras (coming from a point and click), and I'm in love with this camera! It's nothing too fancy, and I like that I was able to purchase the body without having to settle with the lens it came with. It's a little daunting at first, but once you figure out the settings and what everything means, it's absolutely wonderful. Couldn't be happier!
Answer: the zoom rating may be because there is a small cmos sensor on this Camera, if it were a full frame sensor (as opposed to the small 'crop sensor'  the lenses would have a true mm focal length, but because this, and most Digital SLR's under $2,000 use a 'crop sensor' so the camera body will automatically extend the focal length slightly from the lenses focal length.