My First Pinhole Album with a Fomapan 100 Film

3

After my previous article with a review of this film with normal exposure times, here, I post my impressions about pinhole bulb exposures. As you know, when the shutter times are greater than 1 second, almost every films require an exposure correction. Read more!

This is my impression of my first pinhole album, made using a Fomapan 100 film roll inside my Diana F+ camera. As you know, the pinhole aperture of this camera is approx. F150, so, even in daylight, you need to use the bulb (B) mode to obtain a photo.

Credits: sirio174

I made these photos using a red filter (with a factor 8x) fixed with adhesive ribbon in front of the lens. Now, in a partially cloudy day, a 100 ISO film requires an aperture of F11 with a time of 1/60s without this filter. When you insert the red filter, the time increases to 3 stops, to 1/8s.

Credits: sirio174

Now, the pinhole aperture is 7-8 stop smaller than F11, so you must increase the exposure time up to 16 – 32 seconds.

Credits: sirio174

With this exposure time range, almost every film is subject to the Schwarzschild effect, that is, a reciprocity failure in the time-aperture rule. If you download the .PDF data sheet of this film, you can see that an exposure of 1 second requires a 2x extra time, an exposure of 10 seconds an 8x extra time and an exposure of 100 seconds a 16x correction factor. So, to take photos in this conditions, an interpolation between these data shows that you might use an exposure time between 160 and 480 second.

Credits: sirio174

This time was too long for me, because when I took these photos there were people that were walking in the streets and a little car traffic. I could not ask to the pedestrians or cars to wait more than half a minute!

Credits: sirio174

So, I decided to push this film at 400 ISO! Now, a 2x pushing of a low speed film is almost always a disaster, because the contrast increases abruptly, destroying the grey tones of the film. In these cases, there is a great recipe: a stand development in Rodinal (or R09 One Shot), at 1+100 dilution!

Credits: sirio174

The development process was made in a tank, with a constant agitation for the first minute, then only few inversions every 30 minutes, for a total time of 90 minutes. The old Rodinal developer has a compensating effect when you use it at 1+50 or 1+100 dilution, and the film contrast remains acceptable.

Credits: sirio174

As you can see in the photos taken in the woods, the red filter has has blackened the foliage color, making it darker than usual.

Credits: sirio174

Few photos are still underexposed, because I didn’t have an exposure meter with me.

Credits: sirio174

As you can see, the color of the sky before the thunderstorm was fantastic and dramatic! This is a great film, cheap but reliable, great to make experiments both with normal or long exposures. These photos were taken in Civiglio, a very small village in the mountains near my city, Como.

written by sirio174 on 2013-06-01 in #reviews #reciprocity-failure #pinhole #civiglio #como #requested-post #diana-f #schwarzschild-effect #long-exposure #italy #red-filter

3 Comments

  1. wuxiong
    wuxiong ·

    Great article and the fotos turn out fantastic...^..^

  2. sudhashunmu
    sudhashunmu ·

    excellent article

  3. lucaro
    lucaro ·

    Very nice article!

More Interesting Articles