Not sure if this is the right place...

[teatime0315]

So i have been asked two questions.

If a negative is underexposed, has it recieved too much light or not enough light?
- I am assuming its "not enough light". Correct me if I am wrong.

What is the difference between digital and optical zoom?
- I know the differences ... but I can't explain it.

I was wondering if you guys could help me out
Thanks

 

[m21s]

Originally posted by: teatime0315
So i have been asked two questions.

If a negative is underexposed, has it recieved too much light or not enough light?
- I am assuming its "not enough light". Correct me if I am wrong.

What is the difference between digital and optical zoom?
- I know the differences ... but I can't explain it.

I was wondering if you guys could help me out
Thanks

Your first question, you are correct.

Second question.

Digital zoom works by magnifying a part of the captured image using digital manipulation. This is the same as how a graphics program resizes an image to a larger size. The process involves taking a certain number of pixels and creating a larger image, but because the new image is based on the same number of pixels, the image loses quality. At small zooms (up to 20x) the loss may not be too noticeable. At large zooms (up to 100x or more) the quality becomes absolutely terrible.

Optical zoom is the zoom spec which matters. Optical zoom is provided by the lens (i.e. the optics) and does not lose image quality. The zoom is provided by a telephoto lens.

 

[teatime0315]

Thanks a bunch