Harbour Twilight
There is a lot of insight and useful information for anyone visiting this beautiful, colourful and friendly city. If you have any questions, please ask away I will be happy to answer.
Greetings from Canada's Far East! :-)
Monday, October 31, 2011
My City
A very informative post on National Geographic about my hometown St John’s Newfoundland, I thought I’d share it with you. The title of the post ”I Heart My City: Karen’s St. John’s, Newfoundland”.
Harbour Twilight
There is a lot of insight and useful information for anyone visiting this beautiful, colourful and friendly city. If you have any questions, please ask away I will be happy to answer.
Greetings from Canada's Far East! :-)
Harbour Twilight
There is a lot of insight and useful information for anyone visiting this beautiful, colourful and friendly city. If you have any questions, please ask away I will be happy to answer.
Greetings from Canada's Far East! :-)
Monday, October 17, 2011
Elements of Exposure
It seems from my workshops this year that one of the concepts of photography people have some trouble with is exposure. So I thought I write a post on the subject.
Exposure can be controlled by:
Please Note:
The terms stop and f-stop can sometimes be used interchangeably in reference to exposure whereas f-stop is also used to describe the lens aperture setting. In either case we are talking exposure.
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SHUTTER SPEED
The length of time the shutter is opened, exposing the sensor to light. The sensor, or image sensor, is the electronic chip which “records” the image; it is this sensor which replaced film. The longer the shutter is open the greater the amount of light reaching and exposing the sensor.
APERTURE OR F-STOP
The iris or opening of the lens which allows light through. The wider the iris opens the more light is allowed to reach the sensor. Think of it as the iris or more specifically the pupil in your eye. When you go into a dark room your iris expands to let in more light so you can see. Inversely when the light is bright your iris contracts to reduce the light. Aperture is referred to in terms of f-stops and in today’s nomenclature a larger number f-stop say f8 is smaller when compared to f1.4, which is a larger aperture.
ISO
The sensitivity of the image sensor. With film it was referred to as film speed. Simply put the lower the ISO the less sensitive the sensor is to light, the higher the ISO the more sensitive the sensor is to light.
---------------------------------------------
Putting it all together
A stop also sometimes referred to an f-stop is half or doubling the light reaching the sensor.
In terms of shutter speed, moving from one of these values to another is one stop adjustment. So doubling or halving the shutter speed is ONE stop.
In terms of aperture moving from one of these values is an adjustment of one stop.
In this case f8 lets in half the light of f5.6 and twice the light as f11. Numbers wise doubling or halving the f-stop number is TWO stops adjustment (for example f5.6 to f11 is two stops).
In terms of ISO, moving from one of these values to another is one stop adjustment. So doubling or halving the ISO is ONE stop, as is the case for shutter speed.
---------------------------------------------
Here’s how I remember it. If you double or half your shutter speed or ISO you are making a one stop adjustment. If you double or half your f-stop number, then this is a two stop adjustment.
I tried to make this as simple as possible while providing a minimal technical data. It often takes people some time to understand this or think this way. So don’t sweat it and if you have any questions please feel free to ask.
Exposure can be controlled by:
- Shutter Speed
- Aperture
- ISO
Please Note:
The terms stop and f-stop can sometimes be used interchangeably in reference to exposure whereas f-stop is also used to describe the lens aperture setting. In either case we are talking exposure.
---------------------------------------------
SHUTTER SPEED
The length of time the shutter is opened, exposing the sensor to light. The sensor, or image sensor, is the electronic chip which “records” the image; it is this sensor which replaced film. The longer the shutter is open the greater the amount of light reaching and exposing the sensor.
APERTURE OR F-STOP
The iris or opening of the lens which allows light through. The wider the iris opens the more light is allowed to reach the sensor. Think of it as the iris or more specifically the pupil in your eye. When you go into a dark room your iris expands to let in more light so you can see. Inversely when the light is bright your iris contracts to reduce the light. Aperture is referred to in terms of f-stops and in today’s nomenclature a larger number f-stop say f8 is smaller when compared to f1.4, which is a larger aperture.
ISO
The sensitivity of the image sensor. With film it was referred to as film speed. Simply put the lower the ISO the less sensitive the sensor is to light, the higher the ISO the more sensitive the sensor is to light.
---------------------------------------------
Putting it all together
A stop also sometimes referred to an f-stop is half or doubling the light reaching the sensor.
In terms of shutter speed, moving from one of these values to another is one stop adjustment. So doubling or halving the shutter speed is ONE stop.
1/125 1/250 1/500 1/1000 1/2000
In terms of aperture moving from one of these values is an adjustment of one stop.
1.4 2.0 2.8 4 5.6 8 11 16 22
In this case f8 lets in half the light of f5.6 and twice the light as f11. Numbers wise doubling or halving the f-stop number is TWO stops adjustment (for example f5.6 to f11 is two stops).
In terms of ISO, moving from one of these values to another is one stop adjustment. So doubling or halving the ISO is ONE stop, as is the case for shutter speed.
100 200 400 800 1600
---------------------------------------------
Here’s how I remember it. If you double or half your shutter speed or ISO you are making a one stop adjustment. If you double or half your f-stop number, then this is a two stop adjustment.
I tried to make this as simple as possible while providing a minimal technical data. It often takes people some time to understand this or think this way. So don’t sweat it and if you have any questions please feel free to ask.
Friday, October 7, 2011
Bonavista
Bonavista is one of my favourite places to photograph. It is located on the tip of the Bonavista Peninsula about a three hour drive from St John’s, the capital of the province of Newfoundland and Labrador Canada.
As a landscape photographer I am most attracted to it’s amazing shores. It must have stricken terror in the eyes of mariners; it is a rugged coastline of stunning natural beauty.
These first four images are taken in and around Dungeon Provincial Park
Bonavista is one of the oldest settlements on the northeast coast and still retains much of its small town historic charm.
And then there are the animals. Bonavista has a large public pasture adjacent to Dungeon Provincial Park. In (and sometimes outside) and around the pasture you will find horses, sheep and goats graze. I’ve personally had a few interesting experiences with the animals.
Hope you enjoyed the images!
As a landscape photographer I am most attracted to it’s amazing shores. It must have stricken terror in the eyes of mariners; it is a rugged coastline of stunning natural beauty.
These first four images are taken in and around Dungeon Provincial Park
Bonavista is one of the oldest settlements on the northeast coast and still retains much of its small town historic charm.
And then there are the animals. Bonavista has a large public pasture adjacent to Dungeon Provincial Park. In (and sometimes outside) and around the pasture you will find horses, sheep and goats graze. I’ve personally had a few interesting experiences with the animals.
Hope you enjoyed the images!
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