So, using the recently acquired “plate holders” to hold the photographic paper in the back of my, now modified, Boots Half Plate Mahogany camera, I have taken and processed some successful pictures.
Boots half plate camera
Taking the exposure using my iphone and the “Lux” app and judging the ISO of the paper to be 25, I made 3 exposures of the paper at f32 for 4s (as Lux indicated) and also, 8 and 16 seconds. As 8 seconds was the most successful. Seeing as the app had suggested 4s as the correct exposure, I will assume now the ISO equivalent of the paper is 50 and work on that basis for the next tests.
I developed the paper and got three well focussed images with a full tonal range.
The images produced are of course negative images. These I then scanned in to the computer and through photoshop inverted the tonal range to give the black and white image you see here.
The dynamic range is too great and I understand “flashing” the paper before use can help reduce this. That’s the next experiment.
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