> One approach to saving weight while increasing telephoto reach is to use a smaller sensor I make a 'soft' change to the the sensor size on my Nikon D850 by s

> One approach to saving weight while increasing telephoto reach is to use a smaller sensor I make a 'soft' change to the the sensor size on my Nikon D850 by switching between FX (full frame) and DX (crop) mode. DX gives me a 1.5 effective multiplication of the focal length, but a still very good resolution of 5408x3600 pixels (uncropped FX is 8256x5504). In some shooting modes (e.g. slow motion video at 1920x1080;30p x4) the camera automatically switches into DX mode, presumably to maintain a high framerate for a sustained period. I've now learned to select a DX crop in advance if there is a chance I might need slow-mo so that I don't get a jarring change in effective focal length mid-way through a shoot.