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posted Sunday, 27 May 2012, 14:15 (+0800), by Martin
While on our way to Injidup Beach last month, we stopped at Wyadup, where I managed to get some
aerial photos of Injidup Beach with my kite.
After the
KAP
session at Wyadup, we headed to Injidup Beach, and this is one of the photos I captured, just before the sun
sank below the horizon.
A 20 second exposure
(possible due to the use of a
10-stop ND filter)
captures the movement of the clouds in the sky, and completely smoothes out the movement of the water.
sunset at Injidup Beach
Injidup Beach, Yallingup, Western Australia
Canon EOS 50D, 10-22mm @10mm (10-stop ND filter), 20 sec, f/8, ISO100
posted Tuesday, 15 May 2012, 20:20 (+0800), by Martin
This is the tenth article in a
series on "understanding your camera"
that I am writing as I teach camera basics and camera operation to my children.
Confusion about Focal Length
A reader of one of my earlier posts in this series, titled
Focal Length, Field of View and Angle of View Defined,
left a
comment
indicating he was somewhat confused by what I had written about focal length.
The commenter, Luis, wrote
I am confused. Some books define focal point as the point where rays parallel to the optical axis converge
(the point that burns when you focus the sun on a piece of paper), and focal length as the distance from the center of the lens to that point.
Also, the rules given in books to construct the image by tracing the rays locate the image away from the focal point.
That is, if you place the film or the sensor at the focal point (as defined above), you don't get any image.
I will be grateful if you clarify what is actually your definition of focal length.
Rather than respond to Luis' questions in another comment, I thought I would explore and respond to his questions in this
blog post.
posted Sunday, 13 May 2012, 14:20 (+0800), by Martin
When I was younger, my parents would take us to Prevelly
(in the south west of Western Australia, right near Margaret River)
for a few weeks every summer holidays.
I have lots of great memories of our times there,
and like to visit the area whenever I'm in the vicinity.
The area has changed a lot over the years, with many more houses, hotels and resorts in the area.
While on holidays in Yallingup recently, we visited Margaret River and Prevelly.
The photo below was stitched using several photos taken by my GoPro HD Hero2 camera,
lifted airborne by my kite.
The end of the Margaret River is visible on the left hand side, while the right hand side
shows the Indian Ocean.
All the plants on the dunes had been decimated by a major bushfire that swept
through the area in November last year, so it looked quite different to what I remembered.
Be sure to click the image below to see a larger version of it.
mouth of the Margaret River and the Indian Ocean
Prevelly, Western Australia
GoPro HD Hero2 (suspended from a kite)
posted Saturday, 05 May 2012, 17:48 (+0800), by Martin
A shutter speed of just under one second captures the waves receeding on the beach,
shortly after sunset at Injidup Beach, just south of Yallingup.
In the distance (on the horizon on the right hand side of the frame), an approaching storm
is visible.
The coastline around the south west of Western Australia has so many interesting
features, and so many different places to explore. The one week holiday we had
last month in Yallingup was definitely not long enough to explore the area,
and I can't wait until I get some time to do more exploring around the south west
with my camera and tripod.
receeding waves
Injidup Beach, Yallingup, Western Australia
Canon EOS 50D, 10-22mm @22mm, 8/10 sec, f/11, ISO100
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