Canon Ef S 18 55mm F 3 5 5 6 Ii Lens For at Amazon
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I have just received my new Canon EF-S 10-22 ultra-wide angle lens. This is one of Canon’s most general lens and is designed for the “crop sensor” series of DSLR. More on what a crop sensor is later. My firstborn thought after a couple of frames is “Wow, this is in truth wide, it wraps around my block.” The question of the day is why do I need a 10-22mm wide angle lens. I already have a EF-S 18-55 zoom that came with Canon X1i camera. So what am I going to do with that extra 8mm of width for a wide angle shot. That 8mm is like a football field when I am shooting a landscape in the distance (well perchance not rather a football field, but close). There is a great need for those of us that shoot landscapes for a wide angle lens. As you might observe in my landscapes I tend to shoot very wide shots with mountains or red rocks in the foreground and the horizon in the distance. I have been shooting most of my landscapes at 18mm with my kit lens on the T1i. That means that I am shooting at 28.8mm in film 35mm size. This is because the T1i is a crop sensor camera with a element 1.6x. Now I have to explain the crop sensor stuff. Suffice to say that there are three ratios of crop sensors in the Canon line of cameras; full sensor, 1.3x, and 1.6x. This refers to the proportionality of the sensor (the computer chip that sees the effigy and translates it to digital). The full sensor is the same size as the 35mm camera of years past. The two other ratios are, in effect, a subset of the full sensor and the 35mm film size. For practical intents this means that the full sensor would see the entire football field, the 1.3x sensor would see inside the 20 yard lines and the 1.6 element would capture inside the 30 yard lines. Now, you math majors out there do not hold me to the precise proportions, I am just attempting to illustrate the concept. Here is a list showing what Canon cameras have which sensor:
Now what does all this have to do with me wanting, needing, lusting after a 10-22mm wide angle? Now you recognise that this lens will fit on my camera (whew, that took a long time). You will likewise recognise that the 10mm, the widest of the wide angle, is actually a 16mm on my camera equated to how it looks on a full frame camera. That is still very good and will capture actually ranging views of those red rocks that I am so fond of. What in regards to the other characteristics of the lens? All the reviews I have read show it to be a very high quality “glass.” Canon designates their top-of-the-line lenses with the letter “L” in the description. Although the EF-S 10-22 f/3.5-4.5 does not carry the “L” designation, the use of three aspheric constituents and one SD factor is a mutual characteristic of a quality lens. My introductory firstborn shots with the lens left me with the impression of how clear and sharp it is. This has quality optical parts and is not a “low-end, buyer type lens”. Some pundits have suggested that if it had not been an EF-S type lens, it might have received the “L” designation, but since it will not fit on a pro level DSLR (EOS 5D,1Ds series), Canon did not give it a “professional” L designation. In fact, no EF-S lenses have the “L” identification to date. EF-S lenses, of course, are designed for use only with APS-C (1.6x) sensor Canon DSLRs and will presently only physically mount on the Digital Rebel series, and EOS 20D,30D,40D,50D 7D. The EF-S design allows the rear element to be closer to the sensor then with EF lenses, bettering effigy quality, peculiarly at the shortest focal lengths. The “S” in EF-S means “short back focus” and now you recognise why. There are a heap of technical reasons that this lens is good for wide shots and landscapes. The reviews have shown that it is very sharp and very fast when automati focusing. On the negative side I will note that, if you use this lens when looking at a person up close it will make them look like they are standing in the circus exhibit with the distorted mirrors. It is distinctly designed for those shots that are as wide as all outdoors. |
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