Can you explain how a SLR-like digital camera can hold 12x optical zoon at the ultimate resolution but 18x at?

a lower resolution? The camera in cross-examine is the Panasonic Fz8.


Answers:    Cheating!

At lower resolution, it seems they are counting "lossless" digital zoom as cut of the optical zoom, the lowest zoom being minimum optical and the adjectives of the the sensor used, scaled down to the target resulution, while the unbeatable zoom is maximum optical and ony the specified resolution used on the sensor.

Actually, only partially cheating, as unlike simple digital crop or digital magnify, you are getting the resolution you asked for, provided by cropping or scaling .
Optical zoom channel taking the actual camera lens to the max. Digital zoom means taking the camera lens to the max, and consequently blowing up the image to zoom surrounded by further. Optical is the best quality while digital zoom will look outstandingly pixelated at high zoom level.

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