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Old Apr 9, 2003, 10:52 PM   #1
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Default Optical Zoom

What does optical zoom exactly do? WHats the differenec between digital zoom and optical zoom? Thanx
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Old Apr 10, 2003, 3:10 AM   #2
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Hi,

To put it really simple.

Optical zoom:
Really zooms, in other words you still use the full resolution of your CCD in the picture.

Digital zoom:
Enlarges the center part of your CCD.
This will result in an interpolated total picture that only has half or less the resolution of a non zoomed image.

Normally you have to steer away from digital zoom, you can better take the picture and later in your editing software interpolate and crop.

Greetings,
Frank
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Old Apr 10, 2003, 11:12 AM   #3
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Even more simply:

Optical zoom uses physical lenses to magnify what the camera sees, and digital zoom takes what the camera sees and magnifies it electronically.
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Old Apr 10, 2003, 12:41 PM   #4
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Even even more simply - optical zoom is useful and digizoom is useless - just ruins pictures.

Wait for the flak!
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Old Apr 10, 2003, 3:50 PM   #5
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:lol:
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Old Apr 10, 2003, 5:22 PM   #6
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Optical Zoom = Awesome (can't live without it)

Digital Zoom = Ugly

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Old Apr 10, 2003, 5:33 PM   #7
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Steve6, I like your analogy! No flak from me!
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Old Apr 12, 2003, 7:20 AM   #8
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There was a discussion recently about digizoom. I said useless and others argued its virtues.

I then revisited digizoom and I'm still of the same opinion - it's a picture destroyer. However, Genuine Fractals does do a decent job.
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Old Apr 12, 2003, 10:07 AM   #9
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But if I remember some of those discussions, there was no clear outcome to the argument:

If you put many more pixels into the ccd, where is the crossover point between lens mag. and electronic mag for the same quality? After all, digizoom does come without lens distortion, sensitivity reduction and the cam is light and pocketable. We all accept image cropping and re-size as necessary, which is small amounts of digital zoom and ask for more pixels to compensate.
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Old Apr 12, 2003, 12:53 PM   #10
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Voxmagna,

The cropping and resizing we do in PS (for example) is much better than the very rude upscaling a digital camera does.

You can better use optical zoom to get the subject and leave it there, and later on the PC or MAC do the digital zooming.

Greetings,
Frank
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