The Helios 44-2 is a vintage lens that produces desired chromatic abberations, such a swirly bokeh. It is a good lens for macro if you are looking for an arty look to your images. It is not as costly as some of the new art lenses, but produces some comparable effects.
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A ladybird against a sunny backdrop.

Mexican sunflowers with a blurred background.

Pink Gypsophila with a swirly background effect.

In-camera multi-exposure of blossom.
