What Is a Film Camera?

Film cameras, that is, traditional cameras, are divided into monocular cameras and binocular cameras. Film cameras use only negatives. Therefore, in terms of cost, consumers need to purchase negatives and print them into photographs. The cost of photo paper is about 60 yuan for each roll of negative film, and about 40 yuan for positive film.

Film camera

Film cameras, that is, traditional cameras, are divided into

Film cameras are a type of modern camera, and all the principles of today's digital cameras are derived from film cameras.

So, when it comes to film cameras, of course we must first understand the history of the camera.

Film camera images are chemically recorded on silver halide film. This item must not be exposed to light, otherwise it will be white after exposure.

Images from traditional cameras must

Compared with digital camera imaging

The storage medium of digital cameras is the sensor, while the sensors of ordinary digital SLRs are APS-C format, that is, one side is blocked at the left and right sides of the full frame, and the aspect ratio is 3: 2 (23.4 * 15.6). In the same proportion, the mid-to-high-end digital SLR part can achieve full frame, which is the same frame as 135 film. Due to the limitation of technical conditions, the imaging of digital cameras cannot achieve the high quality and high level of imaging of film cameras. The imaging latitude of ordinary digital cameras is about 10 stops, and the tolerance of high-end digital SLRs can reach 14 to 15 stops. The latitude of ordinary color film is about 15 stops, and the black and white film can even reach 17 to 19 stops. In terms of imaging quality, digital cameras are not enough to compete with film cameras. Films often need to go through two steps of processing and scanning. The fineness of the picture has a lot to do with the scanning accuracy. Advanced scanners can scan about 1200W pixels (35mm film), but digital SLR does not have this problem. Pixel accuracy is often fixed.

The optical modulation transfer function (MTF) method was used to evaluate the accurate calibration of the camera system and the position of the image plane, and detailed results were given. The estimated on-orbit value of 0.074 obtained from the laboratory average of 0.122 1 7 is consistent with the measured average value of 0.072 5, which proves that the method of shooting the knife edge shadow by film photography and processing the Fourier transform to obtain the MTF method can be used to evaluate the dynamic imaging quality of the space camera. This method uses a laboratory measured camera Dynamic MTF results are a useful attempt to estimate camera on-track dynamic MTF and on-track photography resolution.

Modern camera

Modern cameras are digitized. The speed of taking pictures and storing them is very fast, highly clear, and the speed of phase washing is extremely fast. And you can take photos directly on your computer, complete editing, cancel unnecessary things, and add some scenery or other characters. More convenient than the original camera. Of course, photography can be done in the wild, the effect is exactly the same as at home.