I have heard about people who stack TC's and there is a modification to a TC to allow this. I never really thought quality would result however, the milk bottle pictured is excellent. Even at f11 1/160th at ISO200 should be about the shutter speed required for correct exposure and enough to null any effect of shutter vibration.
The right hand image of the X and stacked TC's really shows the mist of yesterday, hope we have clear skies this week.
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