Not Yet Quite Obsolete

A dull, damp and unpleasant day outside, so although I went out for several hours I did not find anything that I thought was appropriate to blip. Returning home I decided that my picture today would have to be something indoors. A short while ago, while rummaging through the back of our fridge, I came across some photographic materials that I had used in the dim and distant past and placed in a cool location for storage; they had been mislaid. Today’s blip is of two packs of Polaroid film, which are generally used for photographs of equipment or other items, where the picture was required immediately, together with a medium speed 35mm film and two packs of 35mm holographic film, which has exceedingly high resolution (some three thousand line pairs per mm). In general our modern digital cameras can match the performance of these materials, although they cannot yet match that of the holographic film, which although black and white is still some 30 times higher resolution than can be managed by readily available digital cameras. To make a hologram at least some of the grains on the film need to be less than half a wavelength of the light used to illuminate the subject and since the masks made for constructing sensors on digital camera use light rather than extreme short wavelength UV, it might be a while yet before this performance is met.