As a field macrographer, I value maximum depth-of-field as highly as precise focus and composition.
For decades, the Nikkor 105-mm macro lens has enjoyed an industry-wide, sterling reputation for sharpness and brightness. My own bench-testing proved to me that "small aperture" distortion at f/32 is absolutely minimal. Mounted to my Nikon D90 camera, a Nikkor 105D gives me the DOF and resolution desired for my type of hand-held, field macrography.
I can depend on natural sunlight only to a limited extent for macro subject illumination. Multiple flash setups can be cumbersome, and require balancing for effect. True ringlights provide excellent illumination, but flat lighting, which is not desirable for cylindrical and spherical subjects, such as insects. I have found that an O-Flash 3/4-ringlight attachment to my Nikon SB-600 flash unit, provides both excellent illumination to shoot at f/32, and enough off-set lighting to preserve subject roundness.
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