ISO
ISO 1600, f16, 30sec
ISO 3200, f16, 20sec
ISO 6400, f16, 10 sec
ISO stands for International Standards Organisation. Changing the ISO rating alters the strength of the signal passing through the sensor. The ISO rating, along with the shutter speed and aperture, plays a vital part in how the exposure is calculated. All three are linked together, so changing one has a bearing on the others.
Changing the ISO works in much the same way as that of shutter speeds and apertures. Going up a full stop (100 – 200) halves the exposure, while going down a stop (800 -400) doubles the exposure. The lower the ISO the less sensitive the sensor is to light and the more light is required to give the correct exposure, through a longer exposure time and/or wider aperture. Increasing the ISO boosts the signal travelling through the sensor and effectively increases the sensitivity, meaning that a faster shutter speed and/or smaller aperture gives the correct exposure.
These photos were taken at Darley park and these simply explain by just changing the ISO and keeping the aperture and shutter speed the same that the lower the ISO number the less sensitive the sensor is to light and the photo can be under exposed. The higher the ISO number the more sensitive the sensor is to light and the photo can become over exposed. That is just the basics to ISO's. If you were for example to take a picture of a mountain biker on a bright day and wanted to freeze the action you would use a high ISO to increase the sensors sensitivity to light along with a wide aperture to compensate for a fast shutter speed (to freeze action) which equals a short exposure time. The complete opposite is used to show movement in objects like water or a windmill turning. A low ISO along with a narrower aperture and a long shutter speed.
I have demonstrated this using a little bit of my initiative as I don't have a tripod or any other fancy equipment to be able to take photos with a slow shutter speed. So I turned on my kitchen tap balanced my camera on the kitchen side and took photos of the running water using a low ISO with a slow shutter speed and a high ISO with a fast shutter speed and also having to adjust aperture to try and get the best exposure.
Click here to see these. The photos with the fast shutter speeds, freeze the movement of the water and gives the water texture also these photos I think are under exposed and I may of needed to use a flash to get a better exposure, the slower shutter speeds give the water a smooth effect and the pictures are better exposed.
Techniques, materials and resources used for portrait photography 1.1
There are many different formats and techniques that can be applied to portrait photography.
Framing is a technique where by you draw attention to one element of an image by framing it with another element of the image. This gives an image depth and draws the eye to a point of interest in the image.
You could do it by placing your subject in a window or doorway, have them look through a small gap or even use their hands around their face.
Shooting with a wide angle lens attached to your camera can help create some memorable shots when you’re doing portrait photography.
At very wide focal lengths you can create some wonderful distortion. Using these focal lengths will enlarge parts of the face or body that are on the edge of the frame more than what is in the centre.
It can also give a wide open and dramatic impact when your subject is in an impressive setting.
The person in your portrait is the main point of interest – however sometimes when you place them into different contexts with different backgrounds you can dramatically alter the mood in a shot.
Having parts of a portrait in focus draws attention on certain parts of the face or body, or a completely unfocused portrait can add a dreamy effect and make a picture quite abstract.
Black and white portraits can be just as dramatic as colour. By adding a shot of colour can draw attention to certain parts of the photo.
"When we shoot in color, we do not depart from what we see everyday, so our eye expects certain details in order to fill out the image. Black and white photography gives us the opportunity to diverge from this norm, and in a way view reality as an abstraction."
Equipment I have at home and what is avaliable to me at college 1.1
I have at home the Canon 450d camera which comes with the standard 18-55mm lens.
At college there is a wide range of lenses avaliable to use along with higher quality cameras. There is a studio which contains a wide range of backdrops, studio lights, reflectors and soft box.
Canon 450d
This is the camera which I have started out with, the basic entry level canon 450d. For specification details click on the image.
I don't really have any experience of digital SLR's, the only cameras I have used previously are point and shoot digital and film SLR's.
I don't have an opinion on my camera yet as I haven't really used it enough to comment other than I find it fairly easy to use and understand.
Standard 50mm lens
What makes this lens ideal for portriture is its angle-of-view is the closest to our own eyes and the easiest to use to get the most natural looking shots. You can even visualise shots without putting the camera to your eye. This doesn’t mean this lens is boring compared to the extremes that a telephoto or wide-angle will give. On the contrary, it’s just a lens that works well and keeps your photography simple. It is also ideal, as long as you remember not to get too close to your subject, which will lead to unflattering distortion to your sitters face. It works especially well with full-length portraits, but you can get some very nice head and shoulder shots.
70-200mm Lens
The telephoto lens allows you to take tightly composed pictures of subjects where it is impractical to get any closer and to use a wider lens, therefore they are useful for candid photography, this lens is small, lightweight and unobtrusive.
Short telephoto focal lengths are widely used in portraiture for their unnatural, non standard view makes objects at different distances appear closer together than they are in reality. Using a wide angle lens for head and shoulder close ups makes people's noses and other facial features more prominent - while a slight telephoto focal length flattens the features a touch, to give a more flattering result.
Telephotos are also useful in portraiture because when used with largish apertures, it is easy to throw a background out of focus thus drawing the viewers attention to certain parts of the scene.
ISO 1600, f16, 30sec
ISO 3200, f16, 20sec
ISO 6400, f16, 10 sec
Hi
ReplyDeleteI like the way you are free writing your evidence and also recording the technical aspect of what you are doing.
Your experimental image taking will tick off 1.1, 1.4, 1.6, 1.8,2.2
steve