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Kenko Teleplus DG Extension Tube Set
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Kenko DG Teleplus Extension Tube Set
Extension tubes are designed to enable a lens to focus closer than its normal set minimum focusing distance. Getting closer has the effect of magnifying your subject (making it appear larger in the viewfinder and in your pictures). They are exceptionally useful for macro photography, enabling you to convert almost any lens into a macro lens at a fraction of the cost while maintaining its original optical quality.
The Kenko DG extension tubes have no optics. They are mounted in between the camera body and lens to create more distance between the lens and film plane. By moving the lens father away from the film or CCD sensor in the camera, the lens is forced to focus much closer than normal. The greater the length of the extension tube, the closer the lens can focus.
The KENKO DG AUTO EXTENSION TUBE SET contains three tubes of different length, a 12mm, 20mm, and 36mm, which can be used individually or in any combination to obtain the desired magnification.
Kenko's Auto Focus extension tubes are designed with all the circuitry and mechanical coupling to maintain auto focus and TTL auto exposure with most Canon, Nikon, and Sony/Minolta lenses, given there is enough light to activate the camera’s AF system properly.
Please Note: 1. When using extension tubes the lens will not focus to infinity. The focus range will be greatly limited to a very close focusing distance. 2. There is light fall off when using any extension tube, sometimes the equivalent of 3 f-stops of light is lost when using multiple extension tubes together. This light lost can affect the camera's ability to auto focus. Manual focusing is recommended should the lens begin to "hunt" (not lock onto the subject). 3. Nikon "D" information is not transmitted because the lens is focusing closer than it is programmed to focus. 4. Kenko DG Auto Extension Tubes are auto focus compatible with Nikon AF lenses including Nikon AF-S (silent Wave) lenses, as well as Canon EF and EF-S lenses.
| Teleplus Converter Model |
12+20-+36mm Extension
Tube Set |
| Camera Fitting |
Canon, Nikon, Sony
|
|
Length |
12+20+36mm
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| Max Diameter |
62mm
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| Weight |
60g + 85g + 125g
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Image Magnification Ratios & Exposure Factors
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Auto
Extension Tubes |
Distance
Reading on Master Lens |
Image
Magnification Ratio |
FIeld
Coverage (cm) |
Approx Distance
From Lens to Subject (cm) |
Exposure
Factor |
|
12mm
|
infinity
|
0.24
|
10 x 15
|
21
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1.5
|
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0.5m
|
0.35
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6.9 x 10.3
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16
|
1.8
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20mm
|
infinity
|
0.4
|
6 x 9
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13
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2.0
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0.5m
|
0.51
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4.7 x 7
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14
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2.3
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36mm
|
infinity
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0.72
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3.3 x 5
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7.7
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3.0
|
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0.5m
|
0.83
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2.9 x 4.4
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7
|
3.4
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12 + 20mm
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infinity
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0.64
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3.8 x 5.6
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8.5
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2.7
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0.5m
|
0.75
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3.2 x 4.8
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7.5
|
3.1
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12 + 36mm
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infinity
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0.96
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2.5 x 3.7
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6
|
3.9
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0.5m
|
1.07
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2.3 x 3.4
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5.5
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4.3
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20 + 36mm
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infinity
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1.12
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2.2 x 3.3
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5.3
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4.5
|
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0.5m
|
1.23
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2 x 3
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4.9
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5.0
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12 + 20 + 36mm
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infinity
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1.34
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1.8 x 2.7
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4.5
|
5.6
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0.5m
|
1.47
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1.6 x 2.4
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4.2
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6.1
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* The above table shows general values for 50mm standard lenses. Even with standard lenses, individual lenses may have actual values slightly different from these.
* Image Magnification Ratio is the ratio in size (lengths) between the subject and the image formed on the film or sensor surface. For example, Image Magnification Ratio 0.24X means that a 1cm subject becomes 1x0.24=0.24 or makes a picture of 0.24cm size on the film or sensor surface.
* When using an extension tube of same length, the image magnification ratio becomes smaller as the focal length of master lens becomes longer and larger as the focal length becomes shorter. Also, the distance to the subject becomes further away as the focal length of master lens becomes longer and closer when it becomes shorter.
* For other than standard lenses, please calculate according to the following formulae:
| Image Magnification Ratio = |
Length of Exten. Tube + Master Lens Advance Volume
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Master Lens Focal Length
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| Expousure Factor = (1+Image Magnification Ratio)2 | |
| Master Lens Advance Volume = |
Master Lens Focal Length)2
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Master Lens Dist. Reading – Master Lens Focal Length
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| Field Coverage = | Image Size on Film Surface |
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| Image Magnification Ratio | |
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