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Digital SLR Guide News, April 2007 - The Low Light Booster
April 27, 2007
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Digital SLR Q & AI've re-worked this Q & A section a bit so that now each month I'll be answering a reader's specific question. What I previously included in the Q & A section now appears right below in a new section called "Digital SLR Technique".
Question:I'm finding a lot of great bargains on older digital SLRs, but am tempted by the latest 10 megapixel cameras. What should I do?
AnswerIf you're making the move from a compact digital camera to an SLR, you're going to see a huge impovement in speed which should allow you to capture a lot of photos that you could not before. You should also see an improvement in the autofocus system, which helps you get clear shots of fast-moving subjects.
Since you'll get these advantages from ANY digital SLR and not just the latest models, the real questions you must answer are "how big do I want to print?" or "how much do I want to crop my photos?"
Cameras with more megapixels capture larger images, which allow you to print at larger sizes without losing image quality. You can also crop out a 50% of a 10 megapixel file and still have something that will make an exceptional 8x10 print.
Any one of the following reasons will justify the purchase of the latest 10 megapixel digital SLR:
If you find that you don't agree with ANY of the statements above, then save yourself a TON of cash and just go looking for 6 and 8 megapixel digital SLR cameras from 2005 and 2006. Two examples of exceptional cameras that you can now find for discount prices include the 8 megapixel Olympus E-500 (which DOES have dust control) and the 6 megapixel Nikon D50 (since replaced by the D40 and D40x).
One nice thing about the older cameras is that they have a proven track record of success - what better selling point can a camera have besides thousands of satisfied photographers?
Digital SLR TechniqueWelcome to the new section on digital SLR camera technique. This new part of the digital SLR newsletter was previously called Q & A, but as time goes on it's made more sense to make this into its own special section.
Each month I'll be providing a new photography tip or piece of advice that will help you understand more about how your digital SLR camera works, and how to change its settings to get the most out of it.
Over the past couple of months we've been talking a lot about aperture and shutter speed, and I've introduced you to the concept of stops of light.
Today, we're going to launch in a third element: ISO.
I feel that the ISO setting is one of the most powerful and under-used features on modern digital cameras. It's also what many refer to as the third point on the digital SLR exposure triangle (the other two being aperture and shutter speed).
In previous issues of this newsletter, I've established a relationship between aperture and shutter speed.
For the newcomers, the relationships is this:
The trick to any correctly exposed photograph is that these two settings should balance each other out. With this in mind you can have any one of the following combinations for any photo that you take:
But the thing that you'll find once you start really tinkering around with these setting is that there are LIMITS. The most common limit that you'll run up against is insufficient light.
Let's go back to the example I put forth back in the introduction: a labrador running around in a shady backyard.
You know that you want a REALLY fast shutter speed so that the lab doesn't come out looking blurry. How do you get that? Set a very WIDE aperture, as wide as the lens will allow.
You've just run into a limit: what's called the maximum aperture of your lens. Some lenses open significantly wider than others, and let in a LOT more light. If you're using a standard kit lens, that maximum aperture at the wide angle setting is typically f/3.5.
So you've set your aperture to f/3.5, and you take an exposure reading on that lab bounding about the backyard. Uh oh - the shutter speed that your camera has selected for a balanced exposure is 1/250th of a second. The bad news here is that 1/250th of a second is not NEARLY fast enough to get a clear shot of a dog in motion. You're going to need something closer to 1/1000th of a second.
But you've already done everything you can by opening up the lens as wide as it will go right? What else can be done?
Enter ISO. As the ISO setting increases, it makes the sensor able to absorb more light. At ISO 100, the camera is fairly insensitive to light and at ISO 3200 it's VERY sensitive.
In the example we've been working with, if you leave your aperture locked at f/3.5, but INCREASE the ISO to 800, suddenly your shutter speed is going to jump all the way up to 1/1000th of a second, and you're still going get a photo that's correctly exposed.
Think if the ISO setting as the low light booster.
Any time you're taking photos in dim lighting and the LCD display is showing you that they're all a blurry mess, set your camera to program or aperture priority mode, and boost up the ISO as high as you need it until every shot is turning out crisp and clear.
ISO does have an impact on image quality, but we'll dig deeper into that issue next month.
Learning ResourceI've been a huge fan of Photo.net for years, and if you've been cruising the web for photography information you've probably already come across this site.
If you haven't, then here's the 10 second introduction.
While a large part of Photo.net is a photo sharing and critiquing community, they also provide a lot of helpful tutorials and guidance about how to improve your photography.
They also provide a lot of assistance for new camera buyers (like the Digital SLR Guide) and help you narrow down the number of cameras that you need to evaluate based on your photographic needs.
If that weren't enough, Photo.net is a huge source of inspiration for me, since many of the photographers who post take exceptionally beautiful photographs. Rather than being intimidated, I think this is a great opportunity to study what they've done and figure out how you can re-create the same image on your own.
How and WhenThis month's topic is When to Change Your Metering Mode.
Current digital SLR owners will find the following information helpful for clarifying when they should use the relatively obscure "metering mode" setting on their digital SLR.
Prospective buyers should also take note however, because not all cameras meter alike. If you have specific photography needs, then the different metering modes a camera offers might be the tie breaker that helps you make up your mind about which SLR to buy.
What is metering?
Every time you take a photograph, your digital SLR evaluates the scenery in front of you. It takes into account both light and dark areas and tries to create a balanced exposure from all of this information. The element of the camera performing this evaluation is called a light meter.
The meter can either be spread wide to evaluate EVERYTHING that you see when you look through the viewfinder, or it can be narrowed down to just a tiny area in the direct center of the viewfinder.
There are three common metering modes on digital SLR cameras: area, center-weighted average and spot.
As you might be able to guess by their names, the area meter judges all the light that's landing on the camera's sensor, center-weighted average only checks a small circle in the center of the sensor and spot is just a tiny point.
But when to use them?
This photo shows area metering - the camera evaluated the entire scene, and tried to keep the exposure of the sky evenly balanced with the pot in the foreground. The only problem is that the pot is in shade. In order to keep everything balanced, the camera must under-expose the pot (rendering it fairly dark).
By contrast, this photo illustrates spot metering - in this case I spot metered the pot to ensure that it would be properly exposed in the final image. End result? The sky is so over-exposed it appears completely white.
My general rule of thumb for selecting a metering mode is this: if I care that the background is correctly exposed, then I use area metering. Since this is usually the case, I use area metering about 75% of the time.
If I am less concerned about the background, but really want my subject to be correctly exposed, then I shift over to center-weighted or spot. Since I don't take a lot of photos that require the precision of a spot meter, center-weighted is a more common setting for me.
Cameras and Accessories
Latest Digital SLRNikon D40x is not exactly the latest digital SLR to be announced, but it got over-shadowed by the announcement of the Olympus E-410 and the E-510.
While the E-410 and E-510 include some innovative technologies, the Nikon D40x is merely a Nikon D40...with 10 megapixels.
This camera is a good choice for anyone who likes the user-friendly features included on the D40 but isn't satisifed with the 6 megapixel resolution.
Not sure what the Nikon D40 had to offer? Read the complete Nikon D40 Guide.
Digital SLR Camera of the Month
What makes this camera a desireable alternative for anyone who wants the latest in 10 megapixel digital SLR technology?
It's a small, solid camera that takes images with exceptional quality. All of the camera features are easy to change without having to dig through a lot of menus, which is ideal for advanced photographers who change settings all the time and beginners trying to figure out how the camera works.
Ex-film photographers will truly enjoy the Picture Styles feature. Different films had different color qualities - some would capture rich, saturated colors (great for landscapes) while others were designed specifically to capture accurate skin tones. Picture Styles lets you adjust how the camera captures color so that you can use different settings depending upon your subject material.
Read the complete Canon Rebel xTi Guide to find out more.
LinksHere's another new section that I've decided to add to the newsletter: a monthly collection of links to keep you posted about what's new at the Guide and in the world of digital SLR cameras.
Recent Updates to the Digital SLR Guide
Mother's Day Gift Ideas
In ConclusionThat does it for the month of April.
With the exception of the Olympus E-410, the E-510 and the Nikon D40x, there aren't too many new digital SLR cameras on the immediate horizon.
Sony has announced the release of two more digital SLR models, but those are slated for later in 2007. Rumors abound about a new Canon SLR to replace the D30, but concrete evidence of that camera's release has yet to be found.
I don't mind all that much - this is giving me the opportunity to review some older cameras, which are just as capable as their 2007 counterparts.
Speaking of which...I'm just about to put together a comprehensive guide for the Nikon D80, so keep an eye out for that in next month's newsletter or on the Digital SLR Guide Weblog.
Thanks for reading, and happy picture-taking!
--Chris Roberts, Your Digital SLR Guide
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