Remember me saying that orthochromatic film has no red sensitivity? So, why did I pop an orange filter inside my pinhole camera? I was pretty disappointed with the negatives until the light bulb moment happened and I realised that whilst the conditions that day were good for an orange filter – the film wasn’t! The first roll, through the pinhole, was not destined to be a big success due to a schoolboy error. Orthochromatic films can create interesting effects in pictorial applications in that red colours become dark or black, and everything blue becomes white or light coloured.
Early films were typically orthochromatic until the process of adding dyes to increase this sensitivity was developed. Orhochromatic films on the other hand are only sensitive to a part of the visible spectrum, ranging from blue to the end of green. So what is an orthochromatic film? The film stocks we typically use nowadays are panchromatic meaning they react to all colours of the visible spectrum. Over the course of three days I used a roll of the 120 in my Zero Image pinhole camera and another roll in the Bronica SQ-A and finally the Rollei Ortho was put to use in my Horizon S3 35mm swing-lens panoramic camera. When they brought it out in 120 last year I bought a few rolls but for various reasons I hadn’t used them until very recently when the arrival of a 35mm roll of Rollei Ortho 25 Plus prompted me to have a play.
Bronica sq digital back iso#
Ilford Ortho is an ISO 80 orthochromatic black & white film with fine grain and sharpness and “perfect for stunning landscapes” according to the Ilford website.
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