ISO: 12800
Exposure: 1/60 sec
Aperture: 7.1
Focal Length: 100mm
Flash Used: No
Kenko Extension Tube : also called Extension rings are extremely useful in macro photography. they dont contain any glass elements and are hollow. what they do is, move the lens farther from the image plane.
They are placed in between the camera body and the lens.
The Kenko Extension DG set consists of 3 rings or tubes at 12 mm, 20 mm and 36 mm, which can be used either singly or in combination depending on the magnification required.
Advantages of an Extension tube in macro photography
- they are cheap and light weight
- they can convert any lens into a macro lens but best used on prime lens with fixed focal lengths
- they dont contain any glass elements and so no loss of image quality
- u can use combinations of 12 mm, 20 mm, 36 mm, 12+20 mm, 12+36mm, 20+36mm or 12+20+36 mm depending on macro needs
Some disadvantages of Tubes
- the AF becomes painfully slow and hence only manual Focus is recommended
- using all the extension tubes together makes insect photography a pain in the neck as one will have to come really close to the subject to get the 2:1 magnification,
but other than that, these hollow rings are excellent for macro.
The above pic of the eye is not a cropped image. i used the 12+20+36 mm combination on my 5D Mark III and had to come quite close to the eye. after several unsuccessful attempts i managed to get that perfect shot (IMO) of the eye reflecting a flash light. click on the pic to see it in its proper resolution.
Now my only problem will be taking shots like these in the field .
challenge accepted!
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