by Geoff 13 Oct
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Currumbin Rock Pool
Normally I am not too keen on images unless most of the subject matter is quite sharp. Sometimes we use selective focus with a low aperture to blur out some part of the image.
The images in this post have been intentionally taken with a long exposure to intentionally blur the flowing water. I quite like the effect you get by doing this. I do not think that it matters if the water is not sharp as long as all the rocks and other important things in the image are very sharp.
Rapids, Currumbin Rock Pool
The technique to do this is by taking a very long exposure. For both the images above, the exposure was 120 seconds and the camera was placed on a tripod to keep it steady, a remote cable release was also used to avoid camera movement.
A 10 stop neutral density (ND) filter was used to block some of the light, consequently the exposure required was 10 stops longer in time than normally required. Using these filters is not easy, as the filter blocks out so much light that it is difficult to focus the camera through the viewfinder, The secret is to manually focus the camera on the tripod and then place the ND filter on the lens. You will need to take the exposure using manual camera settings and manually allow for the additional 10 stops for the total exposure time required.
by Geoff 31 Dec
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Curtis Falls, Mount Tamborine, Queensland
In my last post I indicated how a neutral density filter could be used to create long exposures with seascapes.
The same neutral density filters can also be used to create interesting effects, to create blurred effects with waterfalls. The above image has been captured with a Nikon D700 camera and 24-120mm zoom lens. The camera settings were an aperture setting of f/9, 20 seconds exposure and an ISO setting of 1,000.
In the above image a 10 stop neutral density filter was used.
10 stops is a very dense filter and it becomes very difficult to see through the view finder, it is best to put the filter on after focussing the lens.
by Geoff 27 May
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Natural Bridge Falls
The movement of water can help to create interesting images. In order to capture images such as these it is essential to use a tripod, as shutter speeds close to 1 second or greater will be required. Generally a shutter speed of 1/8 of a second will start to blur the moving water, but with a tripod any shutter speeds up to 1/2 minute can be tried. Sometimes it is useful if a neutral density filter is used so that longer shutter speeds can be used.
Waterfalls are great to capture the movement of water, also fast flowing streams aroud rocks also can form interesting images.
As well as a tripod some sort of cable release shgould also be used to avoid any blur of the image due to movement of the camera when operating the shutter.
There are further details on tripods and remote camera controls on articles as follows.
- Cave Creek
