MegaPixel 101: July 2008

Fireworks

Posted on 7:47 PM No Comments
Labels: How did I take it?

Fireworks are a common thing for people to photograph. One huge advantage in having a digital camera is the instant feedback whether or not you took the shot right. If it didn't turn out how you wanted it, make some adjustments and try again.

For my first "How did I take it?" post I thought I'd share my experience that I had recently taking pictures of fireworks. Here are the settings that I used to get this shot:

f-stop set to f14
ISO = 100
Manual focus to infinity
Bulb mode for about 1.5 seconds
Use a tripod

For anyone that doesn't know what "Bulb" is, it is manually keeping the shutter open as long as you want. The shutter stays open when you press down on the button and will stay open until you release it. You could keep it open for as long as you want. The reason I used bulb instead of just setting the shutter speed to 1.5 seconds was because it was hard to judge when the fireworks would burst. By using bulb, I could press the button down as I say the shell being fired in the air and then release it 1.5 seconds after it actually exploded. This method made it easier for me to get more of the burst in than just using the shutter set to 1.5 seconds.

If you want, feel free to check out all my fireworks pictures I got using these settings here.

Sharpness

Posted on 4:56 PM No Comments
Labels: The Basics

One of the things photographers strive for is sharpness. This can be hard to achieve. Just because you focus on the subject doesn't mean that you picture will be sharp. Here are some factors that can affect the sharpness of an image:

Bad or Poor Focus: This may seem pretty obvious, but it is the easiest way to not have a sharp picture. Poor focus can be caused by many things like shallow depth of field, focusing on the wrong thing or even just taking the picture too fast without checking the focus.

Subject Movement: If your shutter speed isn't set correctly for the amount of movement, you may get blur if your subject moves. If this happens when you didn't want it to, the easiest fix is to switch to a faster shutter speed.

Camera Shake: You can also get movement blur in your photos if you move your camera while taking the picture. This may be fixed by changing your shutter speed or holding your camera tighter. A tripod or monopod can help keep the camera still.

Noise: If you are using a high ISO setting you are going to get digital noise. Noisy shots are ones that are pixelated and look like they have lots of little dots over them (get up close to your TV and you’ll get the same impact).

Here is a list of 10 easy things you can do to get that sharp picture.

Hold Your Camera Well
Tripods
Shutter Speed
Aperture
ISO
Image Stabilization
Focus
Good Lenses
Check your Vision
Clean Equipment

I'll be going over each of these in more detail in future posts. For the time being, don't forget about the contest. It is open to anyone so give it a shot.

Contest time

Posted on 6:45 PM No Comments
Labels: Contest

To help promote this new site, I have decided to hold a contest. So what is it? Well, I want you to share what you feel is your best photo that you have taken. I'm leaving that open to interpretation. The contest will be judged by you by voting once the submission time has passed.

Here is what you need to know & do to enter the contest:

Compose an email to send to mpixel@ymail.com with subject "Contest"
In the email include the following information:

Photo Title
Your name
Brief description of what you want people to know about the photo
The site that referred you to the contest (if none leave blank) Include site name & URL (UPDATE: If you don't have a site, have the people you refer fill in your full name)

3. Submit your work by August 11, 2008 11:59 pm MST (Anything received after this time will not be eligible for the contest.
4. Once submission time has passed, voting will begin. Voting will be open from August 12, 2008 until August 20, 2008 at 11:59 pm MST

Prize for the Winner:
Based on the votes of users, the winner will receive an e-book copy of The Digital Photography Book by Scott Kelby. If you have not heard of this book, look into it. It is the all time best selling book for digital photography.

The reason I am asking in the email to include the referring site if any is to help get people to the site. If you are willing to refer people to the site, you may get a prize too. The site that has referred the most people will also be eligible for a copy of The Digital Photography Book by Scott Kelby. Get the word out, and it could pay off! Since it may be trickier to contact the owner of the site once the contest is over, the winning site will be included as one of the winners and will need to verify that they are the owner of the site.

Please see Official Contest Rules for more information. Good Luck!

Exif....What is that?

Posted on 4:51 PM No Comments
Labels: The Basics

In my opinion, one of the coolest things about shooting in digital over film is Exif. So if it is one of the coolest things, what is it?

EXIF -Exchangeable Image File Format

Now I can almost hear you saying, that's great, what does that mean? Well in simple terms, every time you take a picture, your camera is recording information. Here are some of the things it records:

Date & Time
Camera settings. This includes information such as the camera orientation, aperture, shutter speed, focal length, metering mode, & ISO information.

Can you see why this is cool information? I'll give an example of something I just shot recently. I thought it would be fun to shoot fireworks. This was something that I had never tried to do before. Back in the days of film, you would have to take notes of all your settings for each frame of film so you could go back and look to see what turned out right and what turned out wrong. With Exif data, I can go back whenever I want to and see the settings that I used. This can be useful in sharing photos with others so they can see what settings you used.

For a simpler example, Exif data has the time & date that you took the picture. (Granted you need to make sure that your camera has this set correctly) Using this data can ease the way that you store your digital photos. You can organize them by date taken & even time taken.

Now that you have a basic understanding of Exif, how can you use it or even see it?

Windows - right click on the actual image and choose properties. From the properties dialog select summary and your Exif data is shown.
Mac OS X - this information may be viewed in the Finder by doing Get Info on a file and expanding the More Info section.

Now it isn't a great idea to edit the Exif information using the above methods as it could damage the Exif file, but it is good for viewing the info. If you feel the need to edit your Exif info, an editor made for that is the best bet. There are free editors out there for whatever platform you are running. By doing a simple internet search you can find tools that will work best for you.

Exposure 101

Posted on 2:12 PM No Comments
Labels: The Basics

Whether you are using film or a image sensor, exposure is the same principle in photography. Exposure is so important that without a correct exposure, your photos will look like garbage. So what makes up Exposure? There are three things that are interconnected to get the correct exposure.

ISO - the measure of a digital camera sensor’s sensitivity to light
Aperture - the size of the opening in the lens when a picture is taken
Shutter Speed - the amount of time that the shutter is open

A change in one of the elements will impact the others. This means that you can never really isolate just one of the elements alone but always need to have the others in the back of your mind.

Metaphors To Relate To Exposure

The Window

Imagine your camera is like a window with shutters that open and close.

Aperture is the size of the window. If it’s bigger more light gets through and the room is brighter.

Shutter Speed is the amount of time that the shutters of the window are open. The longer you leave them open the more that comes in.

Now imagine that you’re inside the room and are wearing sunglasses (hopefully this isn’t too much of a stretch). Your eyes become desensitized to the light that comes in (it’s like a low ISO).

There are a number of ways of increasing the amount of light in the room (or at least how much it seems that there is. You could increase the time that the shutters are open (decrease shutter speed), you could increase the size of the window (increase aperture) or you could take off your sunglasses (make the ISO larger).

Sun tanning

Another way to think about digital camera exposure as being like getting a sun tan.

Now getting a suntan is something I always wanted growing up - but unfortunately being very fair skinned it was something that I never really achieved. All I did was get burnt when I went out into the sun. In a sense your skin type is like an ISO rating. Some people are more sensitive to the sun than others.

Shutter speed in this metaphor is like the length of time you spend out in the sun. The longer you spend in the sun the increased chances of you getting a tan (of course spending too long in the sun can mean being over exposed).

Aperture is like sunscreen which you apply to your skin. Sunscreen blocks the sun at different rates depending upon it’s strength. Apply a high strength sunscreen and you decrease the amount of sunlight that gets through - and as a result even a person with highly sensitive skin can spend more time in the sun (ie decrease the Aperture and you can slow down shutter speed and/or decrease ISO).

As I’ve said - neither metaphor is perfect but both illustrate the interconnectedness of shutter speed, aperture and ISO on your digital camera.

Bringing It All Together

Mastering the art of exposure is something that takes a lot of practice. In many ways it’s a juggling act and even the most experienced photographers experiment and tweak their settings as they go. Keep in mind that changing each element not only impacts the exposure of the image but each one also has an impact upon other aspects of it (ie changing aperture changes depth of field, changing ISO changes the graininess of a shot and changing shutter speed impacts how motion is captured).

The great thing about digital cameras is that they are the ideal testing bed for learning about exposure. You can take as many shots as you like at no cost and they not only allow you to shoot in Auto mode and Manual mode - but also generally have semi-automatic modes like aperture priority and shutter priority modes which allow you to make decisions about one or two elements of the triangle and let the camera handle the other elements.