Olbrich Botanical Gardens - Madison, Wisconsin
All or almost all are full square crops of either 4x3 or 6x4 format and reduced to net size. The Sigma lens on macro mode does OK.
Lets a person stand off a ways ('bout 3 feet). But as a somewhat slow lens, the DOF can get really shallow at the lowest stops, and camera shake gets to be a problem at higher Fstops without a tripod.
Many places it's impractical, or not allowed to use a tripod. This place, an indoor garden was very crowded and much darker than I thought it might be...so didn't get too many keepers.
Canon EOS 10d
Sigma 70-300mm f/4-5.6 APO Macro Super II