I just received my new Canon EF - S 10-22 ultra wide angle. This is one of the most popular lenses from Canonand is designed for the "crop sensor" digital SLR series. Learn more about what a crop sensor is later. My first thought after a couple of frames is "Wow, this is really wide, wrapped my block."
The question of the day is why need a lens wide angle 10-22 mm? I have an EF-S zoom 18-55 that came with camera Canon X1i. So I'm going to do with that extra 8 mm in width for a wide angle shot. This 8 mm is like a football field when I'm shooting a landscape in the distance (well maybe not a field for football, but close).
There is a great need for those of us that shoot landscapes of a lens wide angle. As you can see in my landscapes I tend to shoot wide shots with mountains or red rocks in foreground and the horizon in the distance. I've been shooting the majority of my landscapes in 18 mm with my lens of the XSI kit. This means that I am rolling in 28.8 mm in 35 mm film size. This is because the XSi is a camera's sensor crop with a 1.6 x factor.
Now I have to explain things crop sensor. Suffice it to say that there are three proportions of sensors of crops in the line of Canon cameras; sensor complete, 1.3 x and 1.6 x. This refers to the relationship between the sensor (the computer chip that sees the image and converts them to digital format). The complete sensor is the same size that the of 35 mm camera in recent years. Indeed, the other two coefficients are a subset of the full sensor and the size of the 35 mm film For practical purposes, this means that the full sensor would be the entire pitch, 1.3 x sensor would see 20 lines in the yard and 1.6 factor would be capture within the 30-yard lines. Now, you older math there not keep me the exact proportions, only I'm trying to illustrate the concept.
Here is a list that shows what Canon cameras have what sensor:
Canon EOS 1Ds Mark II and II (full frame)
Canon EOS 5 D and 5 D Mark II (full frame)
Canon EOS 1 D Mark III, IV (Framework 1.3 x crop)
Canon Digital Rebel XSi, XSi, XS (1.6 x crop frame)
Canon EOS 20 d, 30 d, 40 d, 50 D, 7 D (1.6 x crop frame)
Now, what all this have to do with my wanting to, need, lusting after a 10-22 mm wide angle? You know that this lens fit in my camera (whew, that took a long time). Also know that the 10 mm, the larger wide angle, really is a 16 mm in my camera compared to how it looks on a full frame camera. It is still very good and will capture views really scope of these red rocks which I am so fond of.
What happens with the other characteristics of the lens? All the comments I've read show that you a very high quality "glass". Canon designates its lenses on line with the letter "L" in the description. Although the EF-S 10-22 f/3.5-4.5 do not carry the name of "L", the use of three aspherical elements and an element of SD is a common feature of a quality lens. My first first shots with the lens left me with the impression of how clear and sustained it is.
This is quality optical parts and is not a "low-end consumer rate target,". Some experts have suggested that if it had not been a target of type EF-S, could have received the name of "L", but now poised to happen in a DSLR pro level (EOS 5 d, 1 d series), Canon does not give a "professional" L designation. In fact, EF-S lenses have the "L" designation to date.
EF-S lenses, of course, are designed for use only with APS-C (1.6 x) sensor Canon along and will currently only physically mounted in the series of rebel Digital and EOS 20 d, 30 d, 40 d, 50 D 7 D. The EF-S design allows the rear element be closer to the sensor then with EF lenses, improve the quality of image, especially in the shorter focal length. The "S" in EF-S means "short focus" and now you know why.
There are many technical reasons that this goal is good for landscapes and wide shots. Surveys have shown that it is very strong and very fast when auto focusing. On the negative side is taken into account that, if you use this objective when looking at a person up close will make it seem stand in the exhibition of circus with distorted mirrors. It is clearly designed for those shots that are as wide as all outdoors.
Randy Jackson is an experienced photographer from Arizona. His photography is about nature, events, sports and public functions. He writes about photography and the technology on his blog and shows your images on your photography site. Writes about techniques, products, tutorials and the mood of the people in the field who see photography as art. More information can be extracted on Randy in his blog random thoughts of a photographer in http://randyonphotography.com.
Randy Gallery and shop are located in: http://randyjacksonimages.com.
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