15) Zoom Lens: The zoom lens is indispensable when you do not want to change lenses for long or difficult circumstances, and you want to take pictures from various focal lengths. The zoom is variable focal length, unlike s of telephoto lenses that have a fixed focal length. Zoom lenses can have four focal lengths, which would include four different telephoto lenses, say 75 to 200 is: 75 mm 100 mm 135 mm and 200 mm. Its cost is slightly elevated and are much larger and bulkier than the other objectives, the aperture is not greater than a normal lens, varies between 3.8 or less but offers much more than a normal lens, since in a or just can have a normal lens wide angle, macro option and a small TV, the objective has an aperture ring, focus and has one more control that adjusts the focal length . The zoom lens is recommended for any photograph, whether portrait, landscape, sports, and has the option of macro photography
also
also
16) Tele: telephoto lenses are recommended for photographs places where you can not reach, also for nature photography, sports, portrait ... in this type of targets can vary their focal lengths, zoom lenses are known through 100 mm from 200 to 400 and 500 mm focal length is higher, but are called super-telephoto lenses as the 1000 mm focal length. The telephoto lens has less depth of field that a fisheye lens or a wide angle, has a problem, which compresses the visual optical blurring the background, this means, which are more narrow and reduces the depth of field. Focus is much more difficult with a telephoto lens, but the good thing about having a TV is that it can eliminate undesirable funds in the picture, since it reduces Dad depth of field. 
Objective: Tele Format: Color Aperture: 11 Lighting:
Backlight Film 250 Speed: 36 ASA 100 Kodad EPx
Objective: zoom (macro option) Format: Color
Diaphragm: 16 Lighting: Zenith (Bulb)
Speed \u200b\u200b125 (100 WT = 2900 ° K)
Film: ASA 100 Kodad 36 EPx
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