Nikon AF-S 300mm f/4E PF ED VR: Aperture Series 'Looped Oil Pipes'
Get Nikon 300mm f/4E PF ED VR at B&H Photo.
In my first look at the new Nikon 300mm f/4E PF VR ED, this aperture series yields insights into sharpness, bokeh, color aberration control at relatively close range, where atmospheric effects do not intrude on sharpness.
Nikon 300mm f/4E PF VR ED Aperture Series: Looped Oil Pipes (Nikon D810)
The series and analysis includes entire-frame images up to 24 megapixels and large crops, from f/4 - f/11.
My guess is that these carry gasses produced as part of the oil extraction process, since the pipes do not look robust enough to carry a liquid like oil.