[patrickcml]

I'm not a professor. Just a beginner. Would you tell me that the different of optical zoom and digital zoom. I mean that the optical zoom 3x / 4x / 5x is equal to which distance len ( for example : 70mm~210mm...etc).
And how to calculate the image size. For example 300M, 400M...etc

Thank you for your help

Thanks and regards...Patrick

[小小生]

數碼變焦實質上只是影像剪裁,不是變焦
等於影完相回家用Photoshop剪小一點

[tunster]

Optical Zoom 0既倍數都要睇支鏡本身0既 Wide 係幾多. 如果支鏡係 38mm, 3x 光學就係 38 x 3 = 114mm, 即係支鏡0既 Zoom Range 係 38mm - 114mm

3 Megapixel 係 打橫0既 Pixel x 打直0既 Pixel 加埋係 3 百萬個點. 因相機而異, 仲要睇0架相機係影 4:3 定 3:2. eg. 2048 x 1536 = 3145728 pixels

[terrylamnet]

tunster講得好好!!
數碼變焦固然不要理(數碼變焦=無變焦)

但在看光學變焦也要睇下本身支鏡!!