1) optical resolution is not the same as DPI (which I think you know, but its worth pointing out for those people chatting at the back of the class)
2) the way they film is placed on the scanner makes a huge difference to the quality.
the hassblad scanner effectively sucks the film down onto some sort of curved plate, which means that the optics can assume that the film is going to be at position x +- 0.05mm. This is critical because the closer the sensor is to the film, the more the placement affects the quality.
This means that in most highend cases, the film holder has a greater bearing on quality than the sensor/optics.
I have the advantage that at work I have access to a medium format digital camera. This means that I can take really good macro pictures of film negatives. but because the film isn't flat, its a challenge to accurately capture the entire frame. I need to get a proper film gate that slightly tensions the film to make it straight. then I need to worry about getting the camera at 90 degrees to the film.
1) optical resolution is not the same as DPI (which I think you know, but its worth pointing out for those people chatting at the back of the class)
2) the way they film is placed on the scanner makes a huge difference to the quality.
the hassblad scanner effectively sucks the film down onto some sort of curved plate, which means that the optics can assume that the film is going to be at position x +- 0.05mm. This is critical because the closer the sensor is to the film, the more the placement affects the quality.
This means that in most highend cases, the film holder has a greater bearing on quality than the sensor/optics.
I have the advantage that at work I have access to a medium format digital camera. This means that I can take really good macro pictures of film negatives. but because the film isn't flat, its a challenge to accurately capture the entire frame. I need to get a proper film gate that slightly tensions the film to make it straight. then I need to worry about getting the camera at 90 degrees to the film.