Here are the results; 50D using Magic Lantern. No cropping, no tweaking, just text added in Irfanview. All were taken in RAW format and saved as jpg from Irfanview:
Plus the only bee I saw during that session:
The above photo cropped:
All were taken hand held with the aperture fixed at f10, ISO 400, some with added flash. Weather was overcast with no direct sunlight and breezy so most were moving to some extent. On the whole I am very pleased with the results from this Sigma. I'm not usually impressed with that make but this lens looks to have its uses, as does Magic Lantern once I get fully used to using the LCD screen for viewing as the mirror has to be locked up to switch over to their software.