This is a Satellite Dish Head.
I took these two pictures with the lens Canon EF 28-135mm f/3.5-5.6 IS USM on a Canon T1i.
This image is related to an earlier post on wide angle vs semi telephoto (which is actually normal). Here the difference is much more obvious since the background isn't just a wall.
If you ignore the fact that one is a bit overexposed and one is a bit underexposed, you can clearly see a huge difference in term of perspective.
There are several things that affect perspective, one of them is the sensor size. Both of these images were captured with the same camera, T1i, which has a crop size sensor. More precisely it's a APS-C Sensor that if I'm not mistaking has the dimensions of 22.3 x 14.9 mm. This means that if a full frame sensor size camera was used with the same lenses and captured the image in the exact same settings, The image would contain more of the surrounding. In other words, a crop sensor, gives you a cropped image of a full sensor's image.
Given that the sensor is the same in both pictures, the background is clearly seems closer to the subject in the 135 mm shot than in the 56 mm shot. This is due to the properties of light and lenses and how light from a source changes it's path while it goes through a lens depending on its distance from the lens.
I don't want to talk much about bokah and depth of field (DOF) for this image because, the aperture varied and that would make the discussion biased, since aperture plays an important role in depth of field and bokah levels.
In general, you want to use telephoto imaging to reduce the amount of background and foreground in the images since it will compress the horizon. This means telephoto is good for portraits. And normal focal length photography is good to capture a decent amount of the background and a subject... for instance, portrait with background photography.
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