The Obscura 4x5 pinhole camera is Ilford’s second pinhole camera…
This film was tested in the field rather than in controlled light conditions.
A spot meter and the zone system were used to calculate exposures. Negatives were tray processed.
Developers used were ID11 and PMK – Pyro Metol Kodalk.
Testing Bergger Pancro400 4×5
For this test I used the processing data provided on the film box and set the ISO at 400 and processed the negatives in either ID11 1:1 for 17 minutes or PMK 1:2:100 for 18 minutes at 20°c as recommended.
The photograph here West Cape Beach, Cape Conran was made on a bright sunny afternoon with a 90 mm lens and a red filter.
Developed in PMK the negative shows good shadow detail and in the highlight, the sunlit sand has held good detail too.
Without much work this produces a good print using a grade 2 filter. Having been developed in pyro it shows little grain.
West Cape Beach. Cape Conran. Pancro400. PMK
The next two photographs were made on the Snowy River near Marlo at Frenches Narrows not long after sunrise using a 150 mm lens. They were made in quick succession (for a large format camera that is) using Pancro400 and TRI-X320.
Processed in ID11 both have retained detail in the sky and the bank of vegetation on the right. The TRI-X320 looks a little harder and has slightly more contrast. Good prints were produced with a little work using a grade 2½ filter.
Left: Frenches Narrows. Pancro400. ID11
Right: Frenches Narrows. TRI-X320. ID11
The next two photographs show Werribee Gorge in shadow on a bright day. Using a 75mm lens they were also made in relatively quick succession with Pancro400 and TRI-X320 and processed in PMK.
Both show very good tonality, the TRI-X320 having a slight edge in contrast. Both print well, the Pancro400 looks ‘softer’ tonally.
Left: Werribee Gorge. Pancro400. PMK
Right: Werribee Gorge. TRI-X320. PMK
This final photograph shows trees recovering from a recent bushfire at Break Neck Gully in the Lerderderg State Park.
Made on a cloudy afternoon with breaks of sunlight; the black on the burnt trees have held detail as has the slightly damp fallen leaves that are reflecting the cloudy light.
Processed in ID11 this negative prints well using a grade 2½ filter without a lot of work.
Break Neck Gully. Pancro400. ID11
For this film any exposures longer than one second in time need to be exposed for a longer time otherwise underexposed negatives would be produced. This is due to reciprocity law failure. Bergger publish suggested increased times on the data sheet.
I make a lot of long exposure photographs with pinhole cameras, I always test films to match results with expectations.
My testing process was carried out in the field with both a 4 x 5 lensed camera and an 8 x 10 pinhole camera with an aperture of f288. I rated the film at 320 ISO, for this series of tests. Metering was achieved using a one degree spot meter using the zone system. Several different developers were used: ID11, X-Tol and PMK (Pryo). Exposure times were measured with a stopwatch. Test accuracy was determined by contact printing the negative and exposure was deemed correct at the point at which the black edge of the film first appeared ‘black’ on paper graded at two.
Here is the chart of time increases for Pancro400 as determined by these tests:
Meter reading: Change to:
30s 1m 30s
45s 2m 30s
60s 3m 40s
Examples of long exposures corrected for reciprocity failure
Cape Conran. This photograph was made on an 8×10 pinhole camera with an aperture of f288. The metered time at ISO 320 was 45 seconds; this was increased to 2 minutes and 30 seconds.
Algerian Oaks. Made on the 4×5 camera the metered time was four seconds and was increased to six seconds.
Abandoned Boat, Campbells Cove. Made on the 4×5 camera with a yellow filter the metered time was three seconds, this was increased to four seconds.
Merri Creek. Made on the 4×5 camera the metered time was two seconds and was increased to three seconds.
Main photograph at top: Point Cook Jetty, made on 8×10 pinhole camera. Metered time 15 seconds, increased to 35 seconds.
Conclusions on long exposures
The prints produced have a good tonality. For instance, in Abandoned Boat, Campbells Cove there is detail in the dark shadows under the boat and in the peeling paint. Also in Algerian Oaks there is detail in the tree trunks, the leaves and running water.
This reciprocity chart should be use as a starting point, some changes in developing times may be necessary with very long exposures depending on the tonality required.
The time increase for Pancro400 is not as long as some other 400 ISO films, making it very practical for long exposures, partially for pinhole photography.
There is no doubt this is a good film and beautifully packaged. It processes easily and well in a number of different developers. The film feels more like HP5+ in thickness compared to TRI-X320. I had no issues with scratching during tray development.
The grain of the film, as you would expect for an ISO400 film is present, but not overwhelming and varies according to developer used.
I found the film gave best results when processed in PMK developer at the ratio 1:2:100 for 18 minutes (as recommended by Bergger). Fine-tuning by rating at ISO320 when using pyro would be a good starting point.
Neither David Tatnall or View Camera Australia received any compensation for writing this review.
Pancro400 is available in 4×5, 5×7 and 8×10 from Australian agent Gold Street Studios.