Tag: DSLR

How Many Megapixels Do You Need?

How many megapixels do you need? That depends….

Let’s face it, megapixels have been a great marketing tool. “The more there are, all the better,” or so the logic goes. And when a camera manufacturer announces another big jump in megapixels, the photography world sits up takes notice. The question, however, is, ‘How many megapixels do you really need?” Admittedly, this may be different from, “How many megapixels do you want?” The answer to the second question kind of depends on your financial resources and the desire to stay on top of new technology developments. But there is an objective answer to the first question (although it may not be gratifying). But to answer it we need to start at the beginning…

What is a Pixel?

A pixel, or picture element, is a term commonly used across many media – camera sensors, monitors, TVs, etc. But each has its own design. We will stick to the camera sensors.

A single pixel is made up of four elements called pixel sensors arranged in a square pattern. And each element has a colored filter – one red, one blue and two green. It’s called the Bayer pattern.

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Cambridge in Color has a great article titled Digital Camera Sensors, if you care to take a deeper look. The high-level overview begins with colored light coming through the lens and falling on the sensor. At each pixel element the intensity of red, green or blue light is captured. The intensity is voltages that capture a continuous range of brightness, something like dimming or brightening a light bulb. The computer’s processor, among other things, converts the continuous signal from each element into 32,766 discrete digital steps (14 bits). And that is what gets saved on your memory card as a RAW file.

The important takeaway, however, is that each pixel is made up of four elements – one red, one blue and two green.

By the way, you’re probably asking, “Why two green elements?” Well, as it turns out, that mimics the color sensitivity in our eyes. You see, the cones in our retina are sensitive to red, green and blue light. But it turns out that our eyes are more sensitive to green than red or blue. So, making the sensors with two green elements mirrors what the way our eyes work.

Moving on….

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The Future of AI in Photography

AI is in our future as photographers. Take a look at where it is today and where it is likely to go in the future.

I recently became interested in the growing role that Artificial Intelligence, or AI, is already playing and will be playing in photography. Make no mistake, AI has already been deployed in our smart phones. And Adobe and a host of competitors have already enhanced their products with the first round of AI improvements. What effect will AI have on us, whether we be casual or serious photographers, amateurs or professionals? We will all be affected sooner or later. So, let’s take a look and see what’s happening right now and where AI is likely to take us.

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Photographic Gear – the Camera Body

I’m taking you on a tour through my camera bag and the first stop was the bag itself.

Click here to read the article: Photographic Gear – A Tour of a Photographer’s Camera Bag

The next stop is the camera itself. Now, by this, I mean the camera body, not the body and lens. I’ll talk about lenses later.

Like so many of us, my camera got put aside for quite some years. I was very active in photography in the 1970s. I took frequent trips to Yosemite, camping and exploring with camera in hand. I even worked in a photography studio lab for several years, learning the intricacies of color film processing and printing. But then things changed and time for photography dissolved. Until my daughter was about to be born in 1994, that is.

I bought a Canon EOS ELAN with a Tamron 28-200mm lens and shot countless rolls of film, mostly of the new joy in our lives.

clip_image002[4]I resisted the digital movement for a long time, preferring 35mm film. But when I finally joined the movement around 2000, I purchased a digital point and shoot with a big zoom lens. It was a Canon PowerShot Pro90 IS that I cut my digital teeth on with all of its 2.6 megapixels.

I tried to apply what I had learned in the film world for both color slide and negative films to the digital world. I also tried to apply what I had learned in the color darkroom to Photoshop. It took a while to realize that very little of the knowledge and experience I had gained carried over into the digital world. This required a whole new way of thinking, both in the field and in the digital darkroom. For example, with color slides, you normally want to underexpose a little to saturate the colors more. With digital, you overexpose a little to get more detail in the shadows.

clip_image004[4]It was in September of 2004 that I made the jump to a digital SLR when I upgraded to the Canon 10D. With a little over 6 megapixels, I was a big step up from the PowerShot. This is the camera I was carrying around in the duffel bag I mentioned in the previous article.

I did a lot of shooting with the 10D. I was intimidated by RAW processing at first so I shot in JPEG. Sadly, there are a lot of JPEG files that would have been great had I been able to capture them in RAW but, alas…. Eventually, I moved to RAW when I found a software program that made sense. Adobe bought the software when they were developing Lightroom. It made RAW conversion much less intimidating.

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Mastering Sharpness – Fuzzy Photos

How many things can go wrong that can render an image fuzzy.

How many times have you returned from a shoot with some photographs you are really excited about only to find out they are out of focus.  That’s always very disappointing and often frustrating.  And it happens all too often to me.  At the Joshua Tree Gathering this past March someone asked the question, ”How many ways can a photograph be out of focus,” and that got me thinking.  This would be a fun article to write.

But let’s get something straight from the start.  Not all ‘out of focus’ photographs are out of focus.  They may not be sharp but that can come from two causes.  They can actually be out of focus or they can be blurry.  This may seem like a subtle distinction but it’s an important one.  So let’s take them one by one and explore their causes and solutions.

But before we do, I want to make another very important point.  A photograph that is out of focus or blurry is not always a bad thing.  Often times the artist does it intentionally because that is his or her artistic vision.  When it’s done intentionally to create an expressive photograph then it’s not only OK, it’s necessary.  It’s when it’s unintentional that we get frustrated and loose great moments.

But now, let’s get into the details.  We’ll talk about blurs first.

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