This is really interesting, as I have been looking at these two cameras along with many others here.
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But I wanted to love this new Sony, and because I mostly love macro, I did 3 test sets in 3 shops around town. side by side hand held Macro(ish) shots at the counter. I used old circuit boards and LEDs for color tests.
My thought was, with the additional pixels, the macro spread between the Sony and the Canon may appear less - by cropping down the larger Sony image taken from further back. I shot with and without flash, and held the Canon back 1.25", as to be fair, while as it can focus closer, not in macro mode while INSIDE a U/W housing, as in Macro the Canon is fully back from the glass about 1.25". The tests did not use additional Strobes or whatnot as I just don't want to travel with so much equipment. I look forward to smaller U/W lighting units in the (bright) future...
That is not the way to test macro shots. 1st even with a G16 or a Panasonic LX7 once you achieve real life size the image is obscured by the flash shadow so you need to step back. This is where close up lenses kick in and you zoom as you can't be physically on top of fish. Majority of macro life won't be happy with you being closer than 4" except very tiny critters. So the example of shooting on top of something on land is not pertinent. When you are a beginner you think about shooting at two inches from a subject with the bare port and the camera built in strobe at wide end - that is NOT macro and is not good for fish either
You really need to see how a camera performs in the 4-6" range which makes enough room to illuminate your subject properly. At that distance NO compact camera on the market achieves macro . The fact you have a macro button on your camera does not mean you are taking a macro picture. For a picture to be real life size the capture area must be 36x24mm this is not practically achievable by any compact camera underwater. So even with a G16 you need a close up lens to shoot macro underwater the bare port won't do that pure and simple
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