Yesterday’s snow took us by surprise here, it wasn’t forecast for our part of the country and in any event sheltered by the Pennines as we are we don’t usually get too much of the white stuff. Nevertheless, after breakfast this morning I headed into my backyard for the first part of my Trichrome project – the test run in the field (or backyard in my case) and capturing the images.
I started by using the light meter on my phone to check the filter factors of the red, green and blue (RGB) filters I had purchased especially for this test. These suggested that the relevant factors were three for red and blue and two for the green; in the ballpark of where I’d expected them although I decided to do the second of todays four sets at R3, G3 and B3 rather than 323.
I set up three compositions. One with some colourful objects I found in the snow and I photographed this six times, two sets of three images, in order to have a reference for the green filter as discussed above.
I had the Bronica SQ-A setup on a sturdy tripod and fitted with a cable release. Once the composition had been made and the lens focused I touched nothing apart from the cable release and the wind-on lever. My mind thinks of these colours as RGB so it made sense to make the first exposure with the red filter, the second with the green and the third with the blue. Your mileage may differ but the key thing to remember here is that whilst red and blue have the same filter factor the green I was using has a different filter factor (probably – this test will confirm). I took all three exposures within a few seconds of each other, just enough time to carefully change the filters over without bumping the camera, and altered the shutter speed to adjust the exposure for the different filters, leaving the aperture unchanged.
This first composition was photographed twice. The second time I treated all three filters as if they had a filter factor of three (see above). However, I reverted to 323 for the second half of this roll of Fomapan 400.
Whilst the first composition was a still life and evenly lit the second was a wider scene encompassing more of the garden and a little of the sky too. The final set of three was very similar to the second composition but included far more of the sky in the frame.
I wasn’t expecting any issues with taking the images, I’m very familiar with my gear, I’d prepared myself beforehand and had the filters laid out ready to use. I’d considered the filter factors for these new filters and I’d dug out the sturdiest tripod I own so knew nothing would move. A cable release ensured no camera shake and a light reading with my Polaris meter would give the best chance of properly exposed negatives. Being organised and knowing up front what I was going to do helped with a smooth session in the backyard.
Next job is to develop the film, scan the sets of negatives and carefully name the files to incorporate red, blue or green as appropriate in the file name. All being well I will be in a position to try assembling the Trichrome on the computer tomorrow evening or possibly tonight if other things don’t get in the way!
Keep watching this space!