Panasonic ZS100/TZ100 Testing

 


In this section:

General Features of the ZS100/TZ100

Widest Available Apertures with Focal Length

Testing of the Resolution of the ZS100/TZ100 at Different FL and Aperture Settings

ZS100/TZ100 Aperture Series Test Images

Testing the ZS100/TZ100 at Different ISO settings

Comparing the Image Quality of the TZ100 with the TZ80

An Adapter for the TZ100

The TZ100 with Teleconverters

Macro and Telemacro with the TZ100

The TZ100 with Closeup Lenses



Features of the ZS100/TZ100


The TZ100 (called the TZ110 in Australia) is the first in the TZ range to employ a 1” (13.2 x 8.8mm) sensor, and it has a 3:2 aspect ratio.  Previous TZ models, including the new ZS60/TZ80, have a 1/2.3” (6.17 x 4.55mm) sensor with a 4:3 aspect ratio.  The TZ100 sensor therefore has an area which is four times larger than that of the TZ80.


To accommodate the larger sensor in a similar sized body to the TZ80, the zoom range of the TZ100 is considerably shorter, being 25-250mm EFL (f/2.8-f/5.9), compared with the 24-720mm EFL (f/3.3-f/6.4) zoom range of the TZ80.


The TZ100 has a full image size of 5472 x 3648 pixels (20 MP) in 3:2 aspect ratio, while in 4:3 aspect the sides are cropped and the image is 4864 x 3648 pixels (17.5 MP).  The pixel width of the TZ100 sensor is 2.4 µm.


The TZ80 has a full image size of 4896 x 3672 pixels (18 MP) in 4:3 aspect ratio, which is almost (within 3%) the same as that of the full 4:3 aspect ratio TZ100 image.  However, the TZ80’s pixels are 1.2 µm wide, which is only half the size of the TZ100’s pixels.


The larger pixels of the TZ100 have the potential to produce lower image noise and to have a higher dynamic range than the smaller pixels of the TZ80.



Widest Available Apertures with Focal Length


Using A mode on my TZ110 I determined the widest available aperture at each FL setting as I zoomed in from full WA (25mm EFL to max zoom (250mm EFL).  The results are plotted below (click on the image for the full size):



TZ100: Plot of Widest Available Aperture versus Focal length


It can be seen that an aperture of f/2.8 is only available at 25mm EFL, and the aperture narrows quickly as the lens is zoomed in, reaching f/4.1 at 50mm EFL.   By 160mm EFL the widest aperture is f/5.9, where it remains up to the maximum FL of 250mm EFL.



Testing of the Resolution of the ZS100/TZ100 at Different FL and Aperture Settings


At 25mm EFL (Maximum Wide Angle)

I measured the resolution of my TZ110 using the same chart board and lighting which I used for testing my TZ80 as described here.  I took JPG-RAW pairs at 25mm EFL and 125 ISO in A mode at 3:2 aspect ratio and 20MP using a tripod and the 2 second timer across the available aperture range from f/2.8 to f/8. The JPG images were taken at the default settings.  Full sized copies of the 25mm JPG/RAW pairs can be downloaded from the page link below.


Below is a downsized image of the chart board which was used:



Chart Board for 3:2 Aspect Ratio


Results

At 25mm EFL the centre chart resolution was 2600 LPH at all aperture settings except f/8 where it dropped slightly to 2500 LPH.  A figure of 2600 LPH for the centre resolution indicates good performance of the lens at the image centre, being equal to the expected value of sensor height in pixels divided by √2, for a Bayer sensor not limited by lens.  There was variation in resolution at the corners, with an average of 1800 LPH at f/2.8, 1900 LPH at f/4, 2000 LPH at f/5.6, and 1900 LPH at f/8.  The best overall IQ was obtained at f/4, although f/4.5 gave a quite similar result.



At 90mm EFL

I took JPG-RAW pairs at 90mm as described above.  Full sized copies of the 90mm JPG/RAW pairs can be downloaded from the page link below.


Results

At 90mm EFL the best IQ was at f/6.3, and the centre chart resolution was 2600 LPH.  At wider and narrower apertures than f/6.3 the image contrast tended to decline.  The corner resolution was considerably better than at 25mm EFL, being about 2500 LPH, although the contrast at the corners was lower.




At 250mm EFL (Maximum Telephoto)

I took JPG-RAW pairs at 250mm EFL as described above.  Full sized copies of the 250mm JPG/RAW pairs can be downloaded from the page link below.


Results

At 250mm EFL the best IQ was at f/6.3.  There was little variation with aperture, although the results at f/5.9 and f/8 were slightly softer.  The centre resoluton was 2550 LPH.  The corners showed an average resolution of 2400 LPH.  In general, the image contrast at 250mm was slightly lower than at the shorter focal lengths.



I next examined the IQ of the TZ100 at different ISO settings, as described in the page link below.





Continue to ZS100/TZ100 Aperture Series Test Images


Continue to Testing of the ZS100/TZ100 at different ISO settings


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