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Teleconverters 101

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Light weight. Easier to carry. Cons. Light loss ... Tips for using a teleconverter, cont'd. Maintain a relatively fast shutter speed ... – PowerPoint PPT presentation

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Title: Teleconverters 101


1
Teleconverters 101
  • By the Blue Team
  • Nikole
  • Penny
  • Mike
  • Ron

2
What is a teleconverter?
  • An optical device that fits between your camera
    body and the lens
  • Increases the effective focal length of a lens
  • Also called a tele-extender, converter or extender

3
Magnification factors
  • 1.4x is equivalent to a 40 lens extension
  • 200mm lens becomes 280mm lens
  • 1.7x (Nikon) is equivalent to a 70 lens
    extension
  • 200mm lens becomes 340mm lens
  • 2x is equivalent to a 100 lens extension
  • 200mm lens becomes 400mm lens

4
Various teleconverters
  • Dedicated units
  • Available from major camera manufacturers
  • Designed to match certain lenses
  • Best results
  • More expensive
  • Universal models
  • Work on any lens on which they can be mounted

5
Teleconverter mounted to lens
  • Teleconverters are mounted between the camera
    body and the lens being used
  • Nikon F6 with 105mm lens and a 1.4x teleconverter

6
Pros and cons of using teleconverters
7
Pros
  • Offers photographers the ability to shoot at
    increased focal lengths without buying a
    completely new lens
  • Cost saving method
  • Camera specific teleconverter prices can range
    from 285 to 439
  • Universal teleconverter prices can range from
    149 to 210
  • New lenses with the same effective focal lengths
    can cost thousands of dollars

8
Pros, contd
  • An excellent way to increase image size without
    having to get closer to the subject
  • Use when you want to make a long focal length
    lens into an even longer focal length
  • Ability to get more closely framed shots
    (example a full body shot vs. a tightly framed
    upper body shot)
  • Use when you want to increase magnification when
    youre doing a close-up

9
Pros, contd
  • Improved mobility for photographers
  • Convenient to use
  • Compact size
  • Light weight
  • Easier to carry

10
Cons
  • Light loss
  • Teleconverters not only multiply the focal
    length, but also multiply the f-stop by the power
    of the teleconverter
  • F-stop progression is increased by a power of 1.4
    (each f-stop is 1.4 times the preceding one)
  • When the focal length is multiplied by 1.4, the
    aperture decreases by one stop
  • f/2.8 becomes f/4
  • When the focal length is multiplied by 2, the
    aperture decreases by two stops
  • f/2.8 becomes f/5.6

11
Cons, contd
  • Light loss may
  • Force you to use slower shutter speeds than you
    prefer
  • You can increase the ISO sensitivity (digital) or
    use faster film to decrease the effect
  • Cause you to lose the auto focus function
  • Most auto focus systems require a minimum light
    level of f/5.6
  • At any slower aperture, the auto focus system
    shuts off
  • Decrease focusing speed

12
Cons, contd
  • All teleconverters magnify defects, optical
    aberrations and lack of sharpness
  • They also magnify any movement in the camera
    (camera shake)
  • You may increase shutter speed use a tripod to
    decrease the effect
  • All of these factors contribute to a decrease in
    overall image quality

13
Teleconverter 1x
  • The Elusive Mammalian Picnic Table Fish
  • Photographed with a 105 mm lens and NO
    teleconverter

14
Teleconverter 1.4x
  • The Elusive Mammalian Picnic Table Fish
  • Photographed with a 105mm lens with a 1.4x
    teleconverter

15
Teleconverter 1.7x
  • The Elusive Mammalian Picnic Table Fish
  • Photographed with a 105mm lens with a 1.7x
    teleconverter

16
Teleconverter 2x
  • The Elusive Mammalian Picnic Table Fish
  • Photographed with a 105mm lens with a 2x
    teleconverter

17
Tips for using a teleconverter
  • Check compatibility with lenses before using
    teleconverters
  • Use the fastest/best prime lens you can
  • Avoid using zoom lenses, if possible
  • Use a 1.4x vs. a 2x teleconverter (better
    quality)
  • Use the best photographic technique you can

18
Tips for using a teleconverter, contd
  • Maintain a relatively fast shutter speed
  • Increase the camera ISO (digital) or use faster
    film
  • Take advantage of the lens close-focusing
    ability for framing small subjects
  • Shoot with a tripod to eliminate camera shake
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