Local frost

Thought these were quite interesting as a phenomenon of nature. The DA*300 was the only lens I had with me, so I wasn't sure how they would come out. Please feel free to comment on pros and cons of close-ups with a long lens!
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5 (closer crop of number 4)

You seem to have achieved excellent clarity and sharpness. Nothing wrong with long focal lengths for macro shots, sometimes they can be a distinct advantage.

I sometimes use a Mitsuki 230mm for macro. Like your DA, it is very selective of the subject matter and does the same sort of excellent job with it.

Good detail shown and non intrusive background due to DOF.

Best regards