I began with this picture because it representated a departure for me, and a point when I began a long journey of investigation, which is ongoing. I had become fascinated by the effects of sunlight passing through foliage, and it gave me a completely new direction in terms of landscape photography. Instead of the broad, I began to focus on the intimate, and instead of the general, the particular.
I had walked past this scene many times and was waiting for the foliage to really wake up as it does in early summer, and before it becomes tired-looking. One day I realised that the moment had come and I went back to the car to get my gear. I used an MPP MkVIII folding 5×4 technical camera, which is a very similar beast to the German Linhof Teknica, but made by a company in London. These are really nice machines, and usually pretty cheap to acquire, much less than a Tek, anyway.
We have looked at the ways we can regulate our cameras to get the right exposure, but until now we haven’t discussed exposure itself. Correct exposure is simply setting the camera so that the subject is rendered with an appropriate range of tones in the image.
If the camera allows too much light in, or over-exposes, then the image will be too light, appear washed out, and particularly in digital, highlights will ‘blow out’, that is, be rendered as solid, featureless white. If there is not enough light, or under-exposure, the image will be too dark and the shadows will appear jet black with no detail.
All modern digital and film SLRs have very sophisticated systems of measuring the light coming from the subject and setting the camera automatically and this is exactly what a lot of photographers do. I do it myself, if there are no lighting complications or other factors to worry about. However, as soon as you begin to play with aperture and shutter speed, it really helps to know what you are actually doing. Continue reading Photo Technique 5: Brightness and Exposure→
Four key factors in photography are linked: aperture, shutter speed, film or sensor sensitivity and subject brightness. These are linked in such a way that if any one is changed, then one or more of the others must also be changed to compensate. The first two, aperture and shutter speed, are easily controlled on camera, and now we will look at the third factor, which is also under the photographer’s control: film or sensor sensitivity.
In pre-digital days this was always referred to as ‘film speed’ and this is convenient; we continue to use it to describe digital sensor sensitivity — sensor speed. A number of indices or scales were established to measure film speed, but the one that became the most widely used was the American Standards Association, or ASA, scale, which was eventually adopted by the International Standards Organisation or ISO. This is an arithmetical scale, so that a doubling of the ISO value indicates a doubling of sensitivity or speed, and a halving the opposite. (This is as opposed to the more complex DIN scale which was logarithmic.) Because the ISO values are arranged in this way, they conform exactly to the conventions we have already met for aperture and shutter speeds, where each stop or step is a doubling or halving of the one before. So it is easy to apply the same logic to film/sensor speed.
Shutter speed is one of four interdependent parameters that are central to photography. These are : Aperture, Shutter Speed, subject brightness, and film or sensor sensitivity. IF any ONE of these is changed then AT LEAST one other must also change to maintain the same exposure. The most common example of this is that if aperture is altered, then shutter speed must also be altered, reciprocally. So if aperture admits less light, then shutter speed must admit more.
We have already discussed aperture, and seen how the f-stops marked on the aperture ring are calculated and what they are. To recap, the focal length divided by the aperture gives the f-stop, so a 50mm lens with a 25mm aperture is f2, and the they progress f2, f2.8, f4, f5.6, f8 and so on. Each of these allows half as much light to pass as the f-stop before, counting from low to high.
If you look at the lens barrel you will probably see a ring which controls the aperture diaphragm. This will be numbered in f-stops, which on modern cameras will run f1.4,2, 2.8, 4, 5.6, 8, 11, 16, 22, (32, 45, 64). I put the last three in brackets because you’re pretty unlikely to have them but you might see them on view cameras. Note that the numbers double on every second step—2,4,8 etc and 2.8, 5.6, 11 etc. The f-stops are determined by dividing the effective aperture into the focal length, so a 50mm lens with an aperture of 25mm is f2, and with 12.5mm is f4. Each f-stop, going from low number to high, admits half as much light as the one before, so f2.8 is half of f2 etc. It’s easy to work out why if you’re mathematically inclined, but if not, just remember it.
Focus and depth of field are related, and the advancing photographer should understand the relationship between them.
If you are used to using a digital compact, then focus may be something you take for granted. Things just are in focus. But if you are thinking of buying a DSLR or a film camera, then focus becomes much more important. In fact it is one of the primary creative tools the photographer has.
Lenses resolve the light emitted from objects in the world into an image that we can use. Sometimes, as in a telescope, this is for direct observation, and the focus is inside the eye; in photography, resolution is always on a plane behind the lens.
Arbroath January 1972 . I was living in the house at 9 East Grimsby. My Dad had died the previous year and I was still struggling with it. But I had a few things going for me: music, a camera and my books. It wasn’t a lot but it helped.
Russ Black, the art teacher at school encouraged me to use its darkroom. I had lost my own a couple of years before when we moved house. This is one of the earliest rolls I still have from then.
The camera was a Leica Model III fitted with a Ross Xtralux 50mm f2, an excellent lens. I used the name ‘Xtralux’ for a band some years later, in Exeter. Film was Ilford FP3. Continue reading Arbroath January 1972→
Last week we had the first wedding in Molinot for five years. The Bride and groom have been together for years and decided to make it all official. It was a lovely event, very redolent of a rural France that is fast disappearing. Yes folks, la France Profonde is contracting. Soon it won’t be there at all.
Meantime it was nice to see an event like this, with all the colour, hilarity and distinctly earthy humour. This is the Arriere-Cote.
I don’t know when we’ll see the next wedding in Molinot, so better enjoy this one.