Digital Slr
Knowing Which Digital Slr Camera Lens is Right for You?
When shopping for a Digital SLR Camera people often overlook or skimp on the camera’s lenses. Camera Lenses serve as the digital SLR cameras “eye,” the lens determines what and how your camera will see your subject and how well that view is transmitted to the camera’s sensor chip for recording. The way I like to look at camera lenses is as painter’s brushes, broad strokes, medium stokes, all purpose brushes, and small detail brushes. There is a lot to learn about digital slr camera lenses and this article will serve as a basic outline to understanding them. The following sections explain the basic types of digital SLR camera lenses, how they work, and how to select them.
Focal Length
On a digital SLR camera the focal length of the lenses measures the distance between the lens and the image sensor, measured in millimeters. Lenses can be classified into subgroups like prime, macro, wide angle, normal, telephoto, and zoom lenses. They are also rated in regards to f-stop or speed an example would be a F2.0 50mm lens or a 1.4F 80 mm lens. We will explain this later in this article.
Prime Lenses:
Prime lenses are fixed focal length lenses like a 50mm 1.4f lens. To zoom with these types of lenses you need to use your feet and to get closer or farther away from the subject. Traditionally prime lenses are sharper and faster then zoom lenses. If you’re on a budget you can pick up some amazing used older prime lenses off eBay or your local camera store.
Macro Lenses:
Marco Lenses are your detail brushes they enable you to get up close and personal with your subject. These types of lenses are used for extreme close ups on small objects like daisies, pennies, and food but not limited to these types of subjects. Examples of macro lenses are 50mm and 100 mm macros. These lenses are also great for selective focus types of photos.
Wide-angle Lenses:
Wide-angle lenses are your broad stroke brushes; these types of lenses have short focal lengths. The short focal length has the visual effect of “pushing” the subject away from you and making it appear smaller. The beauty of wide-angle lenses is you can be relatively close to your subject and fit a broad stroke of the background into the scene.
One problem with wide-angle lenses is known as convergence, a distortion that makes vertical structures appear to lean toward the center of the frame. A way to check if the wide-angle lenses you are interested in has convergence is to take test pictures before buying the lens. With high quality wide angles lenses like Canon “L” series lenses address this convergence issue well. Examples of wide-angle lenses are 15MM, 17mm, 24mm and 28mm lenses.
Normal Lenses:
Normal Lenses try to mimic how the human eye sees and are some of the most versatile lenses you can use. These are my all purpose brushes, and are somewhere between a wide angle and a telephoto lenses. If you buy just one lens try and buy the fastest normal lenses you can like a 50mm 1.4f lenses. Some examples of normal lenses are 35mm; 50mm, 65mm and some consider a 80mm a normal lens.
Telephoto Lenses:
Lenses with long focal lengths 100mm and higher are called telephoto lenses. A long focal length seems to bring the subject closer to you and increases the subject’s size in the frame. Telephoto lenses also give your subjects a graphic look and flatten out your subject. These lenses are my short stroke brushes.
Zoom Lenses:
Zoom lenses are special because they can be very versatile. These types of lenses vary in their focal lengths and come in many in wide-angle, telephoto, and wide-angle to telephoto. In my bag I carry a 17mm to 35mm my wide–angle broad brush, 24mm to 70mm my medium brush, and a 80mm to 200mm my short brush. With these three lenses I get a very board range of focal lengths for any situation. All of my zooms are at least f2.8 through out the lenses range, which means my f-stop can stay constant while I am zooming in and out. These types of lenses are very expensive but so get what you pay for. When shopping for a zoom lenses check out the f-stop range rating. An example is a 24mm to 300mm f3.5-f5.6 lenses meaning the lowest f-stop you can shoot is at the 24mm range of the lenses and when you zoom to 200mm the lowest you can go is f5.6. Zoom lenses can give you flexibility and versatility all in one lenses. When buying a zoom lens try and get one that is made of glass and is the fastest you can afford, you will not regret it.
Understanding what these different groups of lenses can do will help you make more informed decisions on what lenses to purchase and what to put in your camera bag.
About the Author
Get the best deals on Used Digital SLR Cameras at our marketplace. www.useddigitalslrcamera.com
Time Lapse Tutorial with a Nikon Digital SLR (Part 4)
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Introduction to the Canon 5D Mark II/50D, Vol. 2: Advanced Topics $17.99 Take great pictures with your Canon 5D Mark II or 50D! Push your creativity to the limits; create photographic images that up until now have existed only in your imagination! This guide takes you through Canon’s advanced features, and explains what they are, how they work, and how they can perform in real-world situations. Custom Functions: The 5D and the 50D are endlessly configurable. We go into… |
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Digital SLR Photography, Show Me How Videos $29.20 Digital SLR Photography With Mark Duehmig IN THIS VIDEO YOU WILL LEARN How to get the most from the functionality on your camera: What makes digital SLRs different than film cameras Take control of your camera exposure Manual control of shutter speed for better stop-action photos How to adjust your camera for any lighting conditions Avoid common mistakes with multifunction camer… |
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Introduction to the NIKON D70/D70s Digital SLR $14.89 This training video is organized into easily accessed chapters explaining the features and controls of the D70, and how to use them effectively Real world photographic examples build on the material covered, allowing an understanding of the D70 in order to achieve stunning results in no time. Designed for new to intermediate users. DVD Only / Running Time: 73 minutes Topics include: Simplifying th… |
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Olympus Dslr
Choosing A DSLR Camera – Some Considerations
There are a wide range of options and features available for DSLR (digital single lens reflex) cameras and it can be confusing if you are buying this type of camera for the first time. This guide will help you decide which features are important to you and hopefully help you to choose your ideal DSLR camera.
Price
A major factor in your decision is, of course, the price. DSLR cameras start at about $400 and can be as much as $8000 for a top of the range camera. A camera of between $400 to $1000 would probably be a good choose for a newcomer. Lenses tend to be expensive and can cost more than the camera body do make sure you take this into account when you make your budget.
Format Size
There are four format sizes at the moment for 35mm DSLR cameras.
Full Frame
This format, with a sensor size of sensor size is 36mm x 24mm, is found on most higher end cameras and is the same size as that used in 35mm film cameras.
APS-C
On a Canon camera this format has a 15mm x 22.5mm sensor and on a Nikon 15.6mm x 23.7mm. This format is used by most DSLR cameras except some higher end cameras and Olympus makes. Nikon call it a DX format.
APS-H
This format is only found in a few cameras such as the Canon EOS 1D MkIII and has a 18.7mm x 28.7mm sensor.
Four Thirds
This is a smaller format at 13.5mm x 18mm and is found on Olympus and Panasonic cameras. The aspect ratio is 3:4 unlike other cameras with an aspect ratio of 2:3.
All of the formats will give a good print out up to 11″ x 14″ which is the largest most amateur photographers will usually need. Most cameras below about $1000 dollars use the Four Thirds or APS-C format so the choice is usually dictated by the price rather than performance.
Image Stabilization Systems
Systems for image stabilisation vary between manufacturers. Some systems are mounted in the camera body others on the lens itself. Nikon and Canon use a lens based system and use gyros on the lens to sense movement and keep the optical groups stable. Gyros mounted on the camera body are used by Sony, Panasonic and Olympus in a stabilisation system called a sensor shift. The sensor shifts to compensate for any movement. Although both systems perform equally as well the lens mounted systems need to be included on every lens which adds to the cost. In addition not all lenses have the system included especially prime lenses under 200mm.
Size and Weight
Cheaper cameras tend to be smaller and lighter although, as no DSLR camera is going to fit into a pocket anyway, the size is not of primary important.
Pixel Count
DSLR camera start at about 6 mega pixels (MP) and can be as much as 22 MP for a high end camera. The pixel count will dictate the size that a print can be blown up to and you need to decide how large you would like your prints before you decide on which model to buy. 240 pixels per inch will give a very good quality print so a 6 MP camera will be adequate for a high quality 8″ x 10″ print.
If you need larger prints a 10 MP camera will be capable of producing a good print at a size of 11″ x 14″. A top of the range camera with a pixel count of 22 MP will give excellent 11″ x 14″ prints.
ISO Settings
ISO ranges between 100 and 1600 are found on most lower end cameras. Mid range cameras may have settings up to 6400 and a high end camera can reach as high as 25,500 and as low as 50. Most DSLR cameras will give pictures with low noise at ISO settings between 100 and 800 but the noise dramatically increases above this. The noise at the higher levels can vary considerably between models so, if possible, try to see images taken at higher setting with the cameras you are considering.
Noise
All digital images will have some noise which will be more noticeable at higher ISO settings. Noise comes from the electronics and sensor when the digital signal is produced from the analog signal. All DSLR cameras have noise filtering systems but this works less well above an ISO setting of about 800. Noise reduction softens the image so try to see images taken in low light if you will be using the higher range ISO settings.
Autofocus
Autofocus systems vary a great deal between manufacturers. All auto focus systems work well for static images but can vary a great deal for moving subjects, especially in low light. Check reviews of specific cameras for information on how well auto focus works for the model you are considering.
About the Author
For information on digital cameras and some good deals on Canon Compact digital cameras and Canon DSLR cameras visit
Best Canon Compact Digital Cameras
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Canon DSLR cameras
First Look Review Olympus E620 compact DSLR
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