Abstract
Abstract With the advent of small analytical stereoplotters and the common availability of analytical solutions on personal computers for photogrammetric problems, the use of non-metric 35 mm and 70 mm cameras has increased in recent years. One assumption common to all photogrammetric solutions is that the image points are co-planar. Non-metric cameras which do not possess a film flattening device cannot meet this condition. The CONTAX RTS III, a 35 mm camera with an in-built vacuum attached to the back plane was tested to see if it did provide a superior result to other 35 mm cameras which the authors have investigated. The results achieved were approximately a factor of 2 better than previously experienced and accuracies of the order of 1:5000 or better should routinely be possible with the addition of fiducial marks to this camera.
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