105 f/2.8 VR macro with 2x and stacked 1.4x teleconverters (294mm) reading f/11 1/400 second ISO 800 in full sun, focused to match a butterfly or dollar bill field of view (2'-9") which oddly is closer than the 300mm Tokina with 50mm extension at 4' closest focus. I thought they should be the same? Of course this setup will focus from infinity to about 12" from the sensor and the front element is 9-1/2" from the sensor. You can find a test of the 105 with stacked converters at infinity here.
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.
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