1200mm: Digital Teleconverter

Started 8 months ago | Discussions thread
JakeJY Senior Member • Posts: 5,011
Re: 6.25% of central pixels?
2

Henry Richardson wrote:

Henry Richardson wrote:

OutsideTheMatrix wrote:

I saw Sony's alpha cameras have a 2x "smart" digital zoom and a 4x option, I wonder what the difference is (other than the magnitude of the magnification) and how Sony's 2x "smart" digital zoom compares to Olympus's 2x

2x uses the central 25% of the pixels so 4x would use the central 12.5% of the pixels. Wait, is that right? 12.5%?

Or would it be the central 6.25% of the pixels? 2x uses 25% so 4x would be like taking the 2x 25% and then taking the central 25% of it, right? If so then that would be 6.25%. And then Sony would interpolate that up to full size. Am I right?

Yes that is correct.

2x is 50% the height and 50% the width, so area is (50%)*(50%)=25%

4x is 25% the height and 25% width so area is (25%)*(25%)=6.25%

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