Full pixel crop with the extension tube lens at f/11 1/400 seconds ISO 800 in full sun.

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The first shot is with a 50mm extension tube, the second with a +2 diopter closeup lens. The closeup lens lets me meter but the working distance is too close for skittish insects and even though I could stop down a little further, the depth of field is very shallow and magnification greater. The actual f/stop would calculate out much larger than what the aperture ring says with an extension tube and I used a -5 exposure compensation to meter.