The Targets – Wide Angle
Wide-angle lenses are all those goals that, on a full frame, have a shorter focal length to 21mm (14mm in the case of half frames) As its name suggests, having a focal length so short results in a corner very vision wide. Normally (as seen from the graph) a 35mm focal length lens has a viewing angle of 62 ° while a 18mm can cover the viewing angle around 100 ° (under 14mm is spilling over into the fisheye lenses).
The reasons for using a wide-angle of course are many from the ability to capture scenes of the much more complete and comprehensive than what you could not do with a more traditional goal sewa sound system jakarta. The wide angle lens is for this reason used primarily (though not exclusively) in the landscape
The wide-angle but also the possibility of distorting near objects (fisheye it is in fact the extreme) this feature is used by some photographers to create surreal pictures. In the picture below you see the disproportion of the car’s snout than the rest of the scene.
Obviously this is not so much an advantage as a disadvantage wide-angle lenses have indeed the defect the distortion of perspective (barrel distortion and pincushion)
A defect that still occurs when you get too close to the subject. This is because a short focal length enhances the size of the close-ups in relation to the background elements, expanding their apparent distance.
The objective standard, a wide-angle is able to return a much greater depth of field (aperture number). This also means that the blurriness, with a wide angle, it is virtually impossible. The greater depth also affects sensitivity to vibration of these optics is much more resistant to the micro-vibrations and make blurry pictures with a wide angle is not easy! By contrast, it is unusable for portraiture, having to get too close to the subject deforming.
But if our goal is nature photography, it is essential that this distance is not too minimal to get too close with our goal to make it subject may run away. A 100mm for example focuses (in the ratio 1 1) to 14cm while a 50mm just 7cm probably both too short but certainly a 50mm can not be used to photograph an insect (run away).
Macro lenses are fixed focal length lenses always beware of those objects, variable focus, which often appears in the Macro statement.