Early Wedding Photography: The first known instance of wedding photography dates back to the 1840s, shortly after the invention of photography itself. Due to the limitations of early technology, wedding portraits were often formal and posed, requiring subjects to remain still for long exposures.

Tintypes and Daguerreotypes: In the mid-19th century, tintypes and daguerreotypes were popular photographic methods for capturing wedding portraits. Tintypes were affordable and widely accessible, while daguerreotypes, although more expensive, provided exceptional detail and clarity.

Portable Studios: During the late 19th and early 20th centuries, wedding photographers often operated portable studios, equipped with cameras, backdrops, and props. These studios could be set up at wedding venues or in the photographer’s studio, allowing for more elaborate and controlled portraits.

Film Photography Era: With the advent of film photography in the 20th century, wedding photography became more widespread and accessible to the general public. Professional photographers used medium format and later 35mm film cameras to capture weddings, offering a wider range of styles and approaches.

Digital Revolution: The transition from film to digital photography revolutionized wedding photography in the late 20th and early 21st centuries. Digital cameras offered instant feedback, greater flexibility in editing, and virtually unlimited storage, transforming the way wedding photographers work and allowing for more creative expression. Today, digital photography dominates the industry, with photographers using advanced DSLR and mirrorless cameras to capture weddings in stunning detail.

I personally am still shooting DSLR. I have tried Mirrorless but are not convinced yet. 
But maybe it is around the corner!!