Optical zoom digital camera

Short Description

Large SLR Lens Collection

giant Canon SLR lens collection If you own an SLR and you’re serious about photography you’ll start a lens collection. Håkan Dahlström’s lens collection, via Flickr.

The easiest way to think about zoom is in terms of magnification, for instance a camera with a 4x zoom lens will allow you to magnify the image up to 4x bigger. Lenses get their zoom rating by taking the ratio between the longest and shortest focal lengths. So for example a 35-105mm lens will be rated as 3X ( 105/35 =3). The question you need to ask yourself though is magnified compared to what? That’s a good question and we’ll get to that in a second.

SLR vs Digicam

SLRs do not come with lenses built in, digicams do, that means you’ll need a lens collection for your SLR, Although you may start with one you’ll quickly feel the need to acquire more. Digicams on the other hand come with lenses built in, what they have is what you get.

Visual Difference Between Zoom Levels

When you hear 2X zoom you think twice as big, but that’s actually not true. It’s useful to understand zoom as a form of cropping. When you zoom in you take a crop of a portion of the scene and make it take up the whole image. Of course its done optically so you don’t lose quality. When you zoom in 2X you capture 1/2 the height and 1/2 the width of your original scene. So 2X zoom means you can only capture 1/4 of the 1X image. The image below illustrates this difference – as you can see 8X zoom actually capture just 1/64 of the scene – which equates to a tonne of zoom – 64X the pixels of the zoomed in portion of the scene.

Visual Difference Between 1X, 2X, 4X and 8X Optical Zoom

image showing how much of a scene 1X, 2X, 4X and 8X zoom captures The following image illustrates how much area each zoom level captures of a scene. 1X zoom captures 100% of the scene where as 8X zoom captures 1.6% of the scene – a huge difference! Remix of Photo by Stuck in Customs via Flickr.

Examples of Different Zoom Levels

The following images each illustrates the zooms depicted in the scene above – illustrating the difference in a resulting photo.

Example of a 1X Lens

Example of 1X zoom of a scene This is the scene at 1X zoom, In this case 1X is 14mm so there is negative magnification relative to the human eye but a field of view that is close to the human eye.

Example of a 2X Lens

Example of 2X zoom of a scene This is the scene at 2X zoom, In this case 2X is 28mm so there is a slight negative magnification relative to the human eye and the field of view is smaller than the human eye.

Example of a 4X Lens

Example of 4X zoom of a scene This is the scene at 4X zoom, In this case 4X is 56mm which is similar to the magnification of the human eye but a much smaller field of view.

Example of a 8X Lens

Example of 8X zoom of a scene This is the scene at 8X zoom, In this case 8X is 110mm which is slightly more than twice the magnification of the human eye.

Travel Zoom Cameras

Here are some cameras, we refer to them as travel zooms, that are both compact and offer a high amount of zoom. These cameras represent an excellent compromise between size and zoom and are great for traveling. As you can see in the above example 8X zoom is quite significant and that is the minimum zoom we require for the travel zoom rating.

Panasonic Lumix DMC-TZ20

from 2 844 kr

Zoom Great zoom Help
16x
GPS Built-in GPS Help
Great for travel
Movie format Full HD Help
1080p @ 30fps

Learn more about the Panasonic Lumix DMC-TZ20

Sony Cybershot DSC-HX9v
Sony Cybershot DSC-HX9v

from 2 849 kr

Zoom Great zoom Help
16x
GPS Built-in GPS Help
Great for travel
Movie format Full HD Help
1080p @ 60fps

Learn more about the Sony Cybershot DSC-HX9v

Canon PowerShot SX230 HS

from 2 678 kr

GPS Built-in GPS Help
Great for travel
Zoom Great zoom Help
14x
Movie format Full HD Help
1080p @ 24fps

Learn more about the Canon PowerShot SX230 HS

Nikon Coolpix S9100

from 2 552 kr

Zoom Great zoom Help
18x
Movie format Full HD Help
1080p @ 30fps
Screen resolution High resolution screen Help
921k dots

Learn more about the Nikon Coolpix S9100

Green arrow See more of the top travel zoom cameras

About eagle081183

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One Response to Optical zoom digital camera

  1. Pingback: Panasonic DMC-FZ150K 12.1 Digital Slr Camera | Digital Slr Camera Reviews

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