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One day was sunny which made for some contrasty and distracting leaf backgrounds. I had my nice full frame camera with me on this day, but I had to be very careful and look for a nice even lit background behind my subjects.
The other day was overcast which made for nice even lighting but also a little dull and need of a little more light. I used my cropped sensor camera as it has a small built in flash. So I used the flash set at -2/3 power to give a little fill light and some vibrance to the shots.
The gardens allow you to photograph as much as you want without a tripod and as long as you don't touch the butterflies. Therefore the flash along with the image stabilizing helped me to get a little sharper picture hand holding my camera. This is especially important because a lot of the butterflies are small and you have to get fairly close to get a full frame shot and the depth of field you can get may not be as much as you would like. I also tried to keep the butterfly wings as close to a straight line with the camera for this same reason. Since you are close to the butterflies and the butterflies are close to all the vegetation behind them, it can be a struggle to decide on an f-stop that will be enough to have a sharp butterfly and yet have the background be pleasingly out of focus and not distracting.
I used my 100 mm macro lens and slowly approached the beauties to get some nice close up shots. A slow approach is important because even though the butterflies may sit for a while in a certain area, you don't want them to flit off on you by too fast of an approach.
Happy butterfly hunting!