Which design innovation transformed the modern microscope in the 1980s, dramatically improving its usability in scientific research?

Throughout history, scientific instruments have undergone remarkable design transformations to increase accuracy, usability, and reliability. These changes often reflect both technological advances and deeper understanding of user needs. This poll tests your knowledge about a significant product design milestone in scientific instrumentation that revolutionized how researchers conduct their work.

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The introduction of digital imaging systems that eliminated the need for film photography
The addition of mechanical stage controls that allowed for precise sample positioning
The implementation of fluorescent bulbs that provided more consistent lighting conditions
The development of interchangeable objective lenses with standardized threading systems