Thank you sscnxy! If I could shoot everything with the 180L macro, I would. The 300 and extender combo is more of an example of having another tool available for the situation. The 300L images also have an extension tube that doesn't report in the EXIF, letting me 'throw' an effective 600mm focal length onto a close-up subject. These coneflowers were in a slightly elevated garden with a path through the middle. The closest blossoms I could reach with the 180L with the tripod legs adjusted to the top of a short wall and one leg extended full to the ground. To 'reach' the entire garden, the extended 300 brought the further flowers into the same detailed focus. The 300 + 2x were on the camera from coming from the large pond nearby and the wood ducks. I started with that lens for the flowers before changing to the macro, rather than a 'plan' to use lens / extender for macro shots.