I reckon the first photo covers a huge distance, you can just see a strip of green under the second arched bridge, so that must be the next new footbridge, where you took photos 2 and 3 from. If I’ve got my bearings right it also shows one abutment of the new Launton Station Road bridge. That’s about 2.25 km from the Jarvis Lane footbridge you are standing on…
Yes indeed that's quite correct. Focal length on photos 1 and 4 was the full 400mm on my crop sensor EOS 7D Mk2 and zoom lens. A nice bright and clear day meant the shutter speed was 1/500 and the lens has good active stabilisation so the result is nice and crisp. By comparison the second image was at 200mm, and the wide angle portrait of image 2 was at 18mm.
Great photos. Thanks for the update
Are all the foot bridges now open?
The two at that end of the line between Bicester and Launton are both open. Can't speak about any of the other ones further down the line.