I recently mountain biked to a nearby wildflower field and spent a very enjoyable end of day with the Samyang 135mm f/2 ED UMC Lens (and a large black bear that also showed up). The Samyang 135 is not a macro lens (it's not a good bear lens either), but this lens is great at creating a strong background blur and that is precisely what I wanted this evening.
The sun had set, giving me even, low contrast lighting, and the wind had practically stopped, allowing sharp images to be made without clamping the flower stems in place. I worked along the edge of the field (to avoid damaging the flowers), looking for compositions that could work. This white-trimmed brilliant red poppy caught my attention and I found an angle and background combination that I liked.
When photographing people and wildlife with shallow depth of field, the eye(s) are nearly always the right focus point. When there are no eyes, more difficult decisions sometimes need to be made. In this case, I set the lens to its minimum focus distance and moved in so that the front edge of the upper set of petals was in sharp focus. I later second-guessed my decision and focused on the top edge of the closer flower petal, but ... in the end, I liked the first choice best. The very shallow depth of field covers more of the flower and the stem (also known as a leading line) is more prominent in this version.
The Samyang 135mm f/2 ED UMC Lens performed excellently for me this evening. This lens holds lots of creativity-unleashing potential (and it is a very good value).