Canon 400d Digital Slr
How can I work for the expansion of a zoom for a digital SLR?
I recently received a Canon EOS 400D DSLR and I'm looking for a better lens with a more powerful zoom. However separate lenses are new to me so I'm wrong understand what the lenses are more powerful than others. I was hoping someone would be able to tell me how you can work at strength of the optical zoom on Canon lenses, or give me suggestions of lenses to look. Any help is greatly appreciated. Thank you, Martin.
You already two excellent answers, but I it in at all times, I'll talk to you. My answer adds a little visual aid. There equation has not remotely objective. If we're talking about an "equivalent 35mm focal length of 50 mm is about" normal "without any for expansion. For most digital SLRs, the objective factor of 1.5 to 1.6, a "normal" focal length would be about 31-33 mm. If we return to a 50mm "normal" lens and a 100 mm lens would be a "2" power lens, 200 mm would be 4X, and so on. Just divide the smaller number in the largest number and you get the "X" power of the lens. For example, a 35-80 mm lens is 2.3X zoom. Divide 80 by 35 and you get the result. 35-80 mm lens is 2.3X zoom. Divide 80 by 35 and you get the result. It is usually best to know what the focal length of a lens "35mm equivalent" is a judge and there, rather than relying on the "X" power of the lens. For example, most digital compact point and start at around 35mm and have 3X or 4X zoom. It would be a 35-105 or 35-140. I've seen some that start 28 mm, though. A 3X from 28 mm is 28-84 and a 4X is 28-112. Neither one is a particularly strong telephoto lens and the 4X is about the same as the 3X that starts at 35mm. It is also important to realize that the tradition is that the focal lengths are usually expressed in terms of "equivalent 35 mm ", where" 35 mm "refers to a 35mm camera. It is because of the relationship between the size of the sensor and the actual focal length the target and the angle of view resulting from the lens. I have a point & shoot that is actually a zoom of 5.8 to 24 mm. It is a 4X. The equivalent of 35 mm 28-116 mm. The sensor is 7.2×5.3 mm. (1/1.8 ") (and I wish I knew someone who could explain how hell they came with the sensor size terminology!), I have another point & shoot that is actually a 5.7 to 17.1 mm zoom. It is a 3X zoom. The equivalent of 35 mm 34-102 mm. "How a shorter focal length equivalent to more than 35 mm? You might ask. It is because the sensor is only about 5×4 mm. (1/2.5 ") I have a few Nikon DSLR and – thankfully – they all have the same sensor size. They all have a factor of" lens "of 1.5. It means that you just multiply the effective focal length of the lens to get the equivalent of 35 mm and then you can make comparisons accurately the camera to the camera. Most of Canon, for example, have an objective factor of 1.6. On a Nikon digital SLR, a 28mm lens is the "equivalent to 35 mm "of a 42mm lens. On most Canon digital SLR, the same 28mm is the equivalent of a 45mm lens. These are eg there to show you how freaking confusing it can all become if you try to make sense of the "X" power of a zoom. Ultimately … View 35mm equivalent specifications for the lens. This way, you'll be grading and compare apples to apples. More or less. Here is a mini-tutorial I made myself to compare focal lengths. This is not an objective test or a test of the camera! It simply aims to show the difference between different lengths. The goal was the Nikon 18-200 VR, which is (by definition) an 11X lens, 11X, but that does not tell you what the final image look. I added a picture taken with a 300mm lens. The camera was a Nikon D200 so there is a 1.5X crop factor "," objective factor "Or" focal length multiplier. "There is more explanation on the image itself. It would be helpful if you click on" All sizes "Above the image. Http://www.flickr.com/photos/7189769 @ N04/476181737 / This was done with two different objectives: the Nikon 17-55 and 70-300: http://www.flickr.com/photos/samfeinstein/1245831147/
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