sanderx1 said:
Only if you also claim microfilm films to be regular b&w materials with "microfilm" written on the box too. Because really , the holographic plates and films are more or less to microfilm what microfilm is to regular B&W materials. Not all of them are even silver based.
Thanks. I was only referring to silver based films.
As for microfilm and regular film, due to contrast and imaging requirements, you usually cannot use microfilm for normal imaging and you cannot use regular film do make a good microfilm type image. It can be done.
In the case of silver based holographic imaging, that type of imaging was done and done very well years before any special film of any sort was designed for use with lasers. In the final analysis it is mostly optimization for short, high intensity exposures with a need for special spectral sensitization. But, in a pinch, any number of silver halide B&W films could be used, unlike the situation with microfilm.
There are a lot of non-silver microfilms around as well, at least there used to be.
In any event, there are, in my mind, more barriers and restrictions between normal and micro-films but fewer and less strict roadblocks between normal and laser-films. I have actually never witnessed any sort of suitable crossover between the first two but have personally witnessed the crossover between the second two types of photographic imaging.
Oh, and in terms of microfilm products, they are basically a high contrast fine grained B&W product, so there is nothing special about them except those two aim characteristics, but those aims are very very critical in getting the right image that can be magnified and viewed. Without high contrast and fine grain with low turbidity, you have no micro-film!
A laser hologram interference pattern is so forgiving that you can literally cut it up into pieces and each piece will reproduce the original image. Now, it is true that there is some degradation depending on the size of the pattern used, but it just illustrates the forgiving nature of a holographic image on film.
PE