Last week I had the chance to try out a contrast filter for developing a photo during my black and white dark room photography lesson.
I’m already aware of contrast filters being used on cameras on the lens.
Contrast can be high and low (depending on whether you want your picture be dramatic and bold or if you’re after a more subtle and soft photo).
I learnt that in the darkroom, you can use contrast filters to alter the tonal contrast of your prints (providing you use multigrade or multi-contrast paper).
Contrast filters are built into some enlargers but if the enlarger you’re using doesn’t have this, then a contrast filter can be added to the enlarger (usually fitted into a slot below or above the negative holder).
A contrast filter on the enlarger will allow some light through and alter the way the the tones look on the enlargement.
Contrast filters for the enlarger are numbered and go up in half increments as follows
00 0 1/2 1 1 1/2 2 2 1/2 3 3 1/2 4 4 1/2 5
The lower the number (e.g. 00), the lower the contrast.
The higher the number (e.g. 5), the higher the contrast.
One final thing to note is that when a contrast filter is used on the enlarger, the exposure time will be affected, so I would always need to do a new test strip with the filter in order to work out the new correct exposure time needed.
The title image in this blog is a photo taken during my recent trip to Singapore on my Pentax K1000 camera using Kentmere 100 black and white film. I used a 3.5 contrast filter in the enlarger to make the hotel building more darker and at the same time, make the sky almost white.