<human>:  What are the differences between the various models of the Nikon DSLR line?
<bot>: The Nikon DSLR line includes a range of models that are designed for different purposes, from beginner-level entry-level models like the D3400 to the advanced enthusiast and professional-grade models like the D850. The features on each model vary greatly, with higher-end models offering more features and more capability than their entry-level counterparts. These features can include things like faster shutter speeds, higher frame-rates, more megapixels, more creative controls, more autofocus options, and more lens options. The more advanced models also typically offer weather-sealing, robust build quality, and more silent operation than the entry-level models.