The FoCal IQ Summary Chart

The Summary Chart

The FoCal IQ Summary Chart shows the 7 metrics scores for the lens on a radar chart.

Each metric score has a value between 0 (poor) and 100 (excellent), which is shown for each metric by how far the line is away from the centre of the chart.

A lens with high values

For example, the following is an example of a lens with a good set of metrics:

Example of good Summary Chart

Note that as this is a zoom lens, there are 2 sets of values. The red area shows the results at the telephoto end (35mm in this instance), and the blue area shows the results at the wide end (18mm here). The two areas overlap in most positions, which is why you see mostly purple with hints of blue or red as some points.

The values are generally quite far from the centre, with most have a score above 70. The Vignetting value is a little lower, which you can clearly see with the spoke at around the 7 o'clock position being closer to the centre.

A lens with lower values

The following shows an example of a lens with lower metric values:

Example of poor Summary Chart

The Aberrations and Wide performance are high (shown by being a long way from the centre of the chart, and indicating good performance in both these areas). However, this lens falls down in most other areas.

Note that this is a prime lens, so only a single area is shown in green, as opposed to the red/blue areas for a zoom lens.