Coolpix A edge resolution very low at F2.8 and F4?

Started Jun 1, 2013 | Discussions thread
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Jefftan Senior Member • Posts: 2,483
Coolpix A edge resolution very low at F2.8 and F4?,2817,2417565,00.asp

"I used Imatest to check the sharpness of the Coolpix A's 18.5mm (28mm equivalent) f/2.8 lens. At its widest aperture it delivers impressive center sharpness, scoring a center-weighted score of 2,235 lines per picture height. This is better than the 1,800 lines we require of a sharp image, but it should be noted that edge performance is disappointing at f/2.8 and f/4. At these apertures the edge averages, which analyzes the 20 percent of the frame on the extreme left and 20 percent on the extreme right, scored only 1,041 lines and 1,172 lines respectively.

Stopping the lens down to f/5.6 improves the overall score to 2,417 lines, but brings the edge performance up to 1,894 lines for a much more evenly sharp photo."

The above is very negative accessment and I am not sure it is correct.  Although in daylight I usually shoot at F5.6 but the idea that at F2.8 only 1041 lines resolution at edge is a big turn off if true.

May I ask Coolpix A owner if this testing result of PC magazine is true or they happen to have an early/defective unit?


Panasonic Lumix DMC-F5
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