Continuing with pictures from my walk along the Greenwich Meridian in Greater London in 1984-6.
My walks took me as close to the line of the Meridian I had pencilled on my 1983 1:25000 OS map as possible, though that line may not have been quite exact. I think it goes through the area at the extreme left of the picture above, here just a few yards east of the roadway. My series of walks kept as close as possible to the pencil line, but it often runs through private property, buildings, across rivers etc and many detours, some quite lengthy were required.
One of those fairly lengthy detours was north from Poplar, where the line ran through the gas works site and across Bow Creek. It wasn’t until 2011 that I was able to go onto the former gas works site, having been engaged to photograph the use of a barge to carry away the heavily contaminated soil from the site. The line crosses the river here, going through the left end of the large shed close to the opposite bank, near to Cody Dock. This is also part of a private business estate, though you can now walk along the roadways in it. There are several such areas I have been able to photograph in later years, but I won’t add any other later pictures to these posts.
The line continues through the east end of Stratford Station.
Thinking of the line of the Meridian, I had decided it was appropriate to use a panoramic format, and these pictures were all taken with a swing lens panoramic camera. I think at the time I owned two such cameras, an expensive Japanese model and a cheap Russian one. The Russian was a little more temperamental and it was sometimes difficult to wind on the film, but had a much better viewfinder and I think was probably used for most of these. Both give negatives which are roughly the width of medium format film – 55-58mm – but only 24mm high, the limit of 35mm film, giving a roughly 2.3:1 aspect ratio. There is no discernible difference in image quality.
Both used 35mm film and curve it in the horizontal plane around a little over a third of the outside of a circle, with the lens pivoting roughly 130 degrees around the centre of that circle during the exposure. This keeps the distance between the centre of the lens and film constant, avoiding the distortion produced by using flat film, where the edges of the film are further from the lens node. This gives a very noticeable distortion with ultra-wide lenses, limiting them to an angle of view (horizontal) of roughly 100 degrees.
Swing lens cameras are limited in angle of view only by the mechanical limitations and can generally cover 130-140 degrees. But the curvature of the film does produce its own unique view. Assuming you keep the camera upright, straight vertical lines remain straight as the film is not curved vertically, but non-vertical lines show curvature, increasingly so as you move away from the centre of the film. You can see this clearly in the shop window in Langthorne Rd.
To be continued…
