Macro test - 28-135mm IS USM with Kenko ext. tubes

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$Macro comparison Canon 28-135 IS USM with Kenko ext. tubes\nLens always at 135mm, ISO 200\nExt. tubes: 68mm (12+20+36)\nDistanse from front of lens: 100mm\nExposure: 0.5s - F8.0$ $Macro comparison Canon 28-135 IS USM with Kenko ext. tubes\nLens always at 135mm, ISO 200\nExt. tubes: 56mm (20+36)\nDistanse from front of lens: 100mm\nExposure: 1/4s - F8.0$ $Macro comparison Canon 28-135 IS USM with Kenko ext. tubes\nLens always at 135mm, ISO 200\nExt. tubes: 36mm\nDistanse from front of lens: 100mm\nExposure: 1/5s - F8.0$ $Macro comparison Canon 28-135 IS USM with Kenko ext. tubes\nLens always at 135mm, ISO 200\nExt. tubes: 20mm\nDistanse from front of lens: 100mm\nExposure: 1/6s - F8.0$ $Macro comparison Canon 28-135 IS USM with Kenko ext. tubes\nLens always at 135mm, ISO 200\nExt. tubes: 12mm\nDistanse from front of lens: 100mm\nExposure: 1/6s - F8.0$ $Macro comparison Canon 28-135 IS USM with Kenko ext. tubes\nLens always at 135mm, ISO 200\nExt. tubes: 68mm (12+20+36)\nDistanse from front of lens: 200mm\nExposure: 0.4s - F8.0$ $Macro comparison Canon 28-135 IS USM with Kenko ext. tubes\nLens always at 135mm, ISO 200\nExt. tubes: 56mm (20+36)\nDistanse from front of lens: 200mm\nExposure: 1/4s - F8.0$ $Macro comparison Canon 28-135 IS USM with Kenko ext. tubes\nLens always at 135mm, ISO 200\nExt. tubes: 36mm\nDistanse from front of lens: 200mm\nExposure: 1/5s - F8.0$ $Macro comparison Canon 28-135 IS USM with Kenko ext. tubes\nLens always at 135mm, ISO 200\nExt. tubes: 20mm\nDistanse from front of lens: 200mm\nExposure: 1/10s - F8.0$ $Macro comparison Canon 28-135 IS USM with Kenko ext. tubes\nLens always at 135mm, ISO 200\nExt. tubes: 12mm\nDistanse from front of lens: 200mm\nExposure: 1/15s - F8.0$ $Macro comparison Canon 28-135 IS USM with Kenko ext. tubes\nLens always at 135mm, ISO 200\nExt. tubes: None\nDistanse from front of lens: 200mm (min focus dist)\nExposure: 1/15s - F8.0$