Canon EF 70-200mm f/4L IS USM lens offers the highest possible optical quality with no change in aperture over the focal range of the lens. This allows photographers to set exposure at the widest aperture and zoom all the way through to 200mm without having to decrease shutter speed. Developed for use with a Canon SLR camera, this autofocus telephoto zoom lens offers optimized use with the Canon EOS series digital cameras. Of particular note, Canon has introduced an image stabilizer (IS) that adjusts to meet the demands of professional photography. IS reduces dramatically the image blur caused by camera shake. Gyro sensors detect unwanted vibrations, triggering the corresponding movement of a correcting lens group perpendicular to the optical axis. This alters the light path, returning the image to its correct position on the sensor or film plane. For shooting immobile subjects, Mode 1 corrects for movement in the image along both the horizontal and vertical axes. For shooting while panning horizontally to follow a moving subject, Mode 2 turns off vertical correction and prevents the effect of dragging the subject back through the frame.
The lens' Ring-type USM employs ultra-sonic frequency vibrations to drive auto focus with unrivalled speed and near-silent operation. A powerful CPU and improved AF algorithm contribute to speed performance. The EF 70-200mm f/4L IS USM includes distance metering information, providing compatibility with the E-TTL II flash system of late model cameras such as the EOS-1D Mark II, EOS-1Ds Mark II, EOS 5D and EOS 400D. When used in conjunction with Canon's range of EX Speedlite flash units, the lens passes distance information to the flash algorithm for markedly improved flash exposure metering. Includes Lens hood and soft pouch
Customer Review: It's an L lens. What else do you need to know?
If you know anything about L lenses, you know they are expensive. This is an entry level model. There is something about twisting silky smooth lens rings that is very pleasant. If you want to twist plastic, open peanut butter jars.
Customer Review: I LOVE this lens!
For five years, I owned a Canon Rebel and used a Canon EF 70-300mm f/4-5.6 IS for my telephoto lens needs. Honestly, I was never thrilled with the quality of the photos that came from that combination of camera and lens. My 2 week trip to Greece & Turkey last spring gave me the incentive to finally upgrade my camera (to a Canon 40D) and get better glass. Yes, it was time to buy my first L-series lenses. So I bought both this lens and the 24-70mm f/2.8L. As they say, "It's all about the glass," and I am here to tell you that 'they' are RIGHT! As I go through the many photos I took on my trip, I am thrilled by what I am seeing. The quality (in terms of detail, sharpness, color, etc.) is lightyears ahead of what I've been experiencing. WHY did I wait so long??! The cost, of course. It can be challenging to fork out over $1000 for a lens. Only you can decide if it's worth it for you. I also looked carefully at the Canon EF 70-200mm f/2.8L, with and without the image stabilization, and I narrowed it down to these factors: - IMAGE STABILIZATION - In my opinion, Image Stabilization is a MUST for a telephoto zoom like this. Camera shake is death to the quality of a photo, and once you get over 100mm in length it's hard to avoid completely. Who wants to carry a tripod everywhere you go and/or be severely limited in low-light conditions? - COST - To get the f/2.8L with IS, you're looking at $1700. Yikes. This lens is 1/3 less. - WEIGHT - The f/2.8L is obviously a gorgeous lens, but it's also significantly larger and heavier than the f/4L - increasing the need for image stabilization and/or frequent use of a tripod. I wanted more of a walk-around lens, so the lighter weight of the f/4L along with the fine IS capabilities meets my needs quite nicely. And now that I am seeing the results, I couldn't be happier. The quality is STUNNING, including the sharpness, the color density, and the detail in the highlights and shadows. I only wish I would have bought it sooner and saved myself years of frustration while taking photos with mediocre glass.
Acer Aspire 3100 unites you the best in efficient computing powers and multimedia entertainment. This model of a laptop is perfect for businessmen and college graduates, for children (to do their homework on his laptop) and for office workers, in other words for everyone.
What is the most important thing in any laptop? The most important thing in the laptop is processor. Acer Aspire 3100 has the best powerful processor AMD Sempron 3500+ 1.8GHz. This powerful processor provides a powerful work of the laptop. With the help of this processor the laptop works very quickly.
The 512MB DDR2 533 SDRAM memory is quite enough for running multiple applications. It is possible to make a conclusion that this model of a laptop is quite powerful, not every model of a laptop will allow you to run multiple applications without a decrease in performance. However, this Acer Aspire laptop allows you to do it.
There are many people who cannot live without music and they often complaint that they do not have enough spec on hard drive disk in order to let them store their favorite music. With a spacious 80 hard drive disk space everyone has a wonderful opportunity to store not only working documents, but favorite audio files as well.
A 15.4 inches display is very bright and colorful, watching movies on this laptop's display is a real pleasure. You will be amazed by the brightness and crystal clarity of this display. Windows Vista Home Edition is an operating system of this laptop. It works absolutely great.
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