Panasonic Lumix DMC-SZ7
|Aperture Range [f]||2.0-2.8 to 8||Max Resolution||
4320x 3240 (14M pxl) and lower (see Image Quality pict.)
|Dimensions||99 x 59.4 x 21 mm||Other Resolutions||Multiple in 1:1 4:3, 3:2 and 16:9 aspect ratios|
|Weight||133 g (4.7 oz)||Sensor Size, Pixel Density||6.08 x 4.56 mm, 51 Mpxl/cm2|
This is a 14.1 megapixel camera if recorded in 4:3 aspect ratio. There are several smaller resolution settings, as shown below, with the average resolution in hundreds of line widths per picture height (LW/PH) given below each chart. It has a 10x optical zoom Leica lens f 3.1(at equivalent of 25mm) - 5.9 (at equivalent of 250mm).
The largest theoretical resolution is 32 (x100 LW/PH). In the charts shown above (click to magnify) it reaches 2400 LW/PH only in the center of the 1x zoom photo. Interestingly, at 1x zoom there is a remarkable drop of sharpness away from the frame center, not observed in other zoom settings. All other zoom setting (except "digital", that is above 10x) have roughly uniform sharpness in most of the frame surface, around 2000 LW/PH. However it's obvious, but it is worth noting that the digital zoom by no means improves the resolution. Since the camera resolution is the same at 14M and 10M mode (number of recognized lines), it makes sense to use it in the 10M format as you won't gain more details in the 14M mode. At the 10x optical zoom magnification the camera resolution resembles more like a 5M pixel camera even at its 14 Megapixel mode.
The image quality decreases with increasing ISO. The image below shows a cropped fragment (for the cropped area see the image at the bottom of this page) of a photo made at 14M mode made at different ISO. Even at the lowest sensitivity of ISO 100 you can see image degradation caused by the processing software. It does not look like a jpg-compression but rather noise removal effect. Due to increasing noise and its automatic smoothing you can see gradual loss of detail with increasing ISO settings.
This is very small point and shoot camera that delivers relatively good quality images. It would be desirable if instead of 14M pixels it would be an 10M pixel sensor, perhaps giving better quality images, especially at higher ISO settings.
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