When: 4 October 2009
Where: Kloofzight Lodge, Muldersdrift
Cost: R700
Bookings: Tracy-Lee Behr
021 530 3379
tracy-lee@ramsaymedia.co.za
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A Resource for people interested in Nature and Wildlife Photography in Africa
How aperture affects the way you see patterns
Aperture determines your DOF.
By selecting your DOF, you can create even more impact in an image. It can add great DOP
throughout an image and show a pattern in its entirety, or it can select one part of a pattern
and leave the others a soft out of focus blur. These selections may seem simple, but they are
extremely effective in creating a stronger impact in your image.
Using aperture you can also select certain subjects and isolate them from a scene. This is
probably the most powerful manner that a selective aperture can influence an image and is
extremely effective in isolating subjects from the image or the background.
Creativity with Shutter speed
Shutter speed determines if you freeze or blur your photograph. This obviously lends itself to
more creative applications. A fast shutter speed freezes motion and is thus good for action
A slow shutter speed causes blur: so when used on a tripod, it can be used for some really
creative effects.
Shutter speed selection
Still Portrait - 1/60 sec
moving portrait - 1/125 sec
Action
Walk- jog- 1/250 - 1/500 sec
Sport and fast action - 1/750 - 1/1250
extreme action- birds in flight, snowboarding etc 1/1250 - 1/2000
Blur - (Tripod required)
Slight water blur - 1/30 sec
complete blur - 2 sec and more
Night Photography
This is a great way of experimenting with your photography, as the results are fascinating. A
tripod is essential here as well as a cable release, but a self-timer on the camera will also
suffice. Night colours are very warm and saturated, making for strong images, especially if
there are moving lights in the picture.
A few tips:
• Shutter speed can be from a few seconds- through to a few hours
• If you are taking a photograph of a city scene- results are much better after recent
rain, as the streets will reflect the lights nicely in the image.
• Use a low iso (200). You want the best image quality and your camera is on a tripod.
• In the evening and especially so in winter, there is a ‘blue hour’ about an hour after
sunset. This is when the sky is still slightly blue, but not yet completely dark. It is the
best time to take night images, as it adds ambiance to the image.
• Dusk and dawn, are excellent times to do night photography. This is because the light
colours are extremely beautiful and subtle. Our eyes don’t actually realise these
colours and cameras render them a beautiful colour.
• When shooting stars: for a circular trail of stars, aim your camera to the south
(southern cross) and the whole sky will whirl across your frame.
For more information on Photography courses and how to improve your photography see here.
All text copyright C4 Images and Safaris
Shutter speed: A shutter blade that allows light to enter the camera for a determined time.
Exposure:
Exposure is the resultant image that a camera produces once the shutter release is pressed. It
is the resultant image that comes from a combination of the shutter speed of the shutter and
how much light the aperture let through the diaphragm.
Aperture and shutter speed are the two controls a camera uses to make an exposure on the
film when you "take a picture". Shutter speed is the speed with which the camera's shutter opens when the picture is taken. It is the "click" you here when you push the button.
You probably have seen a dark picture or light pictures; these are illustrations of incorrect
exposures. With Compact cameras, these properties are most of the time beyond your control,
as the camera is working in “auto” mode. The more control you have over an image, the less
incorrect exposures you will have. We are lucky that cameras produce good results 95% of
the time- allowing us to enjoy our photography without worrying too much.
However, creative control comes with you controlling the camera, so your camera will have
to move off the “auto mode” and start working in Aperture” and “Shutter” Priority modes on
your camera.
These modes give you control over what aperture to use and how you can control the
resultant image, allowing extensive creative control.
Added to this equation is Depth of Field (DOP).
Aperture also controls Depth of field. The smaller the hole in the diaphragm; the greater the
DOP. The larger the hole in the Diaphragm; the narrower the DOP. We will cover this later,
for now lets look at shutter speed.
Things to consider when choosing a shutter speed:
There are some basic rules that we need to know:
• Most individuals cannot hold a camera steady (without blur in the photo) for anything
slower than 1/60 of a second.
• Subjects need to be extremely still/steady in order to not show motion/blur in the
image less than 1/60 sec
• Fast moving subjects tend to need shutter speeds of 1/250 of a second or faster into
order to freeze motion or prevent blur.
• The faster the subject, the faster the shutter speed needed
• Low levels of light limit one to a slow shutter speed
• High levels of light may limit one to fast shutter speed
• Thus for low light- one needs support to get a steady shot (or flash)
• For High light levels, can hand hold and good for action shots
ISO
Iso is the digital cameras sensitivity to light. As with film, and asa, iso is determined by an
increase in numbers. As each number doubles, so does the sensitivity of the sensor.
Ie: iso goes up as 100, 200, 400, 800, 1600 etc
With each increase, the sensitivity of the sensor increases.
If all other factors were to remain constant and iso had to increase, then the shutter speed
would have to also increase. For each increase in iso, the shutter speed would halve. This is
due to the sensor being twice as sensitive to light (it needs half the amount of light to make an
image) and thus the shutter speed halves.
One problem with iso is that as it increases, so does images quality decrease. Thus it is almost
not worth taking photographs at iso’s above 800, unless you are going for a specific effect.
Conclusion
Shutter speed, aperture and iso go hand in hand in determining how your creativity. You need
to know how they affect one another and how you can use them to your advantage.
For more information on Photography courses and how to improve your photography see here.
All text copyright C4 Images and Safaris
This site was started as a resource for people interested in photography who would like to travel to, and photography in Africa. Read more >>