Showing posts with label gabriel trần. Show all posts
Showing posts with label gabriel trần. Show all posts
Tuesday, September 13, 2011
Badass me
Last week end I was having fun with the studio. I wanted to add some accessories and took my bike (rollerblade) gloves. Then I thought it'd be fun to make a badass shot. Here it is!
version française
Tags:
badass,
gabriel trần,
home studio
Wednesday, January 19, 2011
Sensitivity to light and ISO
Photography is all about capturing light on a medium (film, sensor, ...). This medium has a sensitivity to light, meaning it needs more or less light coming in to catch successfully a scene.
What we simply call "ISO" refers to a standard of light sensitivity measurement, managed by the International Organization for Standardization (ISO - based on the Greek word isos), or should I say several standards (ISO 5800:1987 for color negative film, ISO 6:1993 for black and white negative film, ISO 2240:2003 for color reversal film, ISO 12232:2006 for digital sensors). Let's keep it simple and stick with "ISO".
A film has a static light sensitivity, a single ISO value, whereas sensors used in digital cameras can change sensitivity and offer a range of ISO values; ISO usually take values from 25 to 6400, but it can start lower and go higher.
How does that influence your photographs? A change in light sensitivity simply means that with a given amount of light let in, the photo you take will appear brighter if the medium is highly sensitive to light (high ISO value), and darker if the medium is less sensitive (lower ISO value). Yes, it means if you work in a dark environment, such as at a concert, you will probably need to select an ISO value of 1600, 3200 or above, and if you take photos in intense light, by a sunny day for instance, you might want to work with low ISO.
Below are images taken in the same environment, I just changed ISO value so you can have an idea of it's impact on image brightness.
There is more to it: high light sensitivity medium produce grainier images, which can be interpreted as lower image quality, or as an artistic effect. Note that this noise is not the same on every medium: two camera sensors at ISO 3200 can have different noise levels.
Fortunately for us, nowadays sensors have very reasonable noise even at high ISO, as you can see below:
Now you have one key to well exposed photographs. Don't hesitate to go to high ISO values, as you can see noises are not that terrible!
version française
What we simply call "ISO" refers to a standard of light sensitivity measurement, managed by the International Organization for Standardization (ISO - based on the Greek word isos), or should I say several standards (ISO 5800:1987 for color negative film, ISO 6:1993 for black and white negative film, ISO 2240:2003 for color reversal film, ISO 12232:2006 for digital sensors). Let's keep it simple and stick with "ISO".
A film has a static light sensitivity, a single ISO value, whereas sensors used in digital cameras can change sensitivity and offer a range of ISO values; ISO usually take values from 25 to 6400, but it can start lower and go higher.
How does that influence your photographs? A change in light sensitivity simply means that with a given amount of light let in, the photo you take will appear brighter if the medium is highly sensitive to light (high ISO value), and darker if the medium is less sensitive (lower ISO value). Yes, it means if you work in a dark environment, such as at a concert, you will probably need to select an ISO value of 1600, 3200 or above, and if you take photos in intense light, by a sunny day for instance, you might want to work with low ISO.
Below are images taken in the same environment, I just changed ISO value so you can have an idea of it's impact on image brightness.
There is more to it: high light sensitivity medium produce grainier images, which can be interpreted as lower image quality, or as an artistic effect. Note that this noise is not the same on every medium: two camera sensors at ISO 3200 can have different noise levels.
Fortunately for us, nowadays sensors have very reasonable noise even at high ISO, as you can see below:
Now you have one key to well exposed photographs. Don't hesitate to go to high ISO values, as you can see noises are not that terrible!
version française
Tags:
c3po,
gabriel trần,
iso,
theory
Sunday, January 9, 2011
Help me improve: C3PO
I don't show a lot of my pictures on this blog, actually before this post I have published one (on bulb fiction). It's not that I am so shy, but I am not very proud of my photos.
With this article, I am requesting your help. Here are three photos below of my C3PO USB key, and I want your opinion. All photos have been taken with a Canon 500D and the 50mm f1.8 lens.
Can you tell me what's good and what's wrong with these photos, how can I improve, what would you change, how to turn them into great shots?
Please share your opinion in the comments, no matter your skill level, whatever you think!
version française
With this article, I am requesting your help. Here are three photos below of my C3PO USB key, and I want your opinion. All photos have been taken with a Canon 500D and the 50mm f1.8 lens.
Can you tell me what's good and what's wrong with these photos, how can I improve, what would you change, how to turn them into great shots?
Please share your opinion in the comments, no matter your skill level, whatever you think!
version française
Tags:
c3po,
gabriel trần,
help,
starwars
Monday, December 6, 2010
Bulb fiction
Now that you have bought yourself a nice remote controller and the requisite tripod, you have new possibilities. You can easily take pictures of yourself, be part of a group photograph, and you are equipped for long exposure shots: light painting, night photography and more.
When configuring your camera for long exposure shots, two possibilities are available to you (on most DSLRs): set a slow shutter speed (a few seconds for example), or activate the bulb mode.
The bulb mode lets you handle manually the exposure time: you press the shutter button, keep it pressed, and release it whenever you want to close the shutter. Although you could just press the button on the camera itself, using a remote control is more than advised to avoid camera shake (yes, even with the tripod it is safer to use a remote).
If you are new to photography, you must be thinking that an exposure time of a few seconds is huge, but with a very limited light, if you want to capture a whole scene you don't have much of a choice. Experiment, check the image histogram to find the best exposure time.
I know long exposure shots need to be developped, it will be the subject of upcoming posts.
Stay tuned!
version française
When configuring your camera for long exposure shots, two possibilities are available to you (on most DSLRs): set a slow shutter speed (a few seconds for example), or activate the bulb mode.
The bulb mode lets you handle manually the exposure time: you press the shutter button, keep it pressed, and release it whenever you want to close the shutter. Although you could just press the button on the camera itself, using a remote control is more than advised to avoid camera shake (yes, even with the tripod it is safer to use a remote).
If you are new to photography, you must be thinking that an exposure time of a few seconds is huge, but with a very limited light, if you want to capture a whole scene you don't have much of a choice. Experiment, check the image histogram to find the best exposure time.
I know long exposure shots need to be developped, it will be the subject of upcoming posts.
Stay tuned!
version française
Tags:
bulb,
gabriel trần,
long exposure,
photozone
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