Black and white film density of simple identification

For the majority of fans, the photo quality determines the success of the shooting, to produce a successful black and white photos. Requires in the printing or zoom in operation before that reasonably determine the exposure time and matching photo paper. As to the kind of negative matching what type of paper, depending on the negatives of the actual density and contrast. The so-called density, popular, is the film silver particles become

For the majority of fans, the photo quality determines the success of the shooting, to produce a successful black and white photos.

Requires in the printing or zoom in operation before that reasonably determine the exposure time and matching photo paper. As to the kind of negative matching what type of paper, depending on the negatives of the actual density and contrast. The so-called density, popular, is the film Black Silver particles, therefore, also known as the "blackness".

Black and white negatives of density values can be used for transmission-density meter accurately measured, but for photography lovers, this is probably difficult to achieve.

In the absence of specialized instrumentation, I recommend a simple method to estimate the density and contrast negatives, thereby determining the negatives should choose what type of photo paper.

Specific method; elected a white, smooth and printed with black text on one side of the paper, turn negative on one side of the text, the corners of the film with your fingers to close down the white, and then under light Department, when light rays through the film got white, after White reflection through the film, and then launched into the human eye, according to the strength of the reflected light to determine the density of the plate size and contrast.

If the maximum film density, can barely make out the black text of the marks, may be considered relatively moderate density. Negatives of minimum density, should generally be higher than negative edge unexposed parts density slightly larger. If negative edge unexposed parts by density, when you look closely you can see, not scrutinised and see it, this is more appropriate. If you can clear vision, that shows the film's fog degrees, this may be because the developer, the developer temperature too high or film expires. If negatives on minimum density than negative edge unexposed parts of fog degrees grows significantly, shooting overexposure. Of course, this approach is only a visual impression by individuals, is neither accurate nor strict, but as long as you use this method for observation of differential negatives, accumulates experience, I believe that the majority of fans, is a big help.

Negatives of density size, determine the length of exposure photo paper; contrast intensity, determines what type of paper used.

In order to be able to produce good photos, zoom in a photo or required depending on the situation of actual contrast negatives to choose the right of the photo paper to adjust the image contrast strong or weak, in order to contrast strong or weak contrast negatives are able to get the normal performance of the image.