|
|
|
|
|
|
|
| Michael Ng | profile | all galleries >> Photo Gear & Reviews >> Effects of TC17EII w/ 105mm Micro | tree view | thumbnails | slideshow |
|
The Nikon 105mm f/2.8G AF-S VR is indeed a very desirable lens. Not only does the lens feature virtually silent autofocusing, it also features nine rounded aperture blades. These to me are the major selling points of this lens. The VR doesnt interest me that much since it can only be used at the reproduction ratios of 1:30 or less according to the manual. In addition to that, having the ability to use a teleconverter and maintain AF and VR functions are a huge plus to the attraction factor of this lens. So here are my findings of using this lens with a TC17EII. 1) Focal Length: The focal length is simply changed from 105mm to 105mm x 1.7 = 178.5mm. But on the EXIF the effective focal length registers as 180mm. 2)Maximum Aperture: Because of the teleconverter, the maximum f-number changes. Adding the teleconverter increases the focal length thus the new maximum f-number changes from f/2.8 to f/4.8. At minimum focusing distance (1:1 macro reproduction ratio) the maximim aperture without the teleconverter is f/4.8 while with the teleconverter on it is f/8. 3) Working Distance: The addition of the TC17EII does not affect the minimum working distance. It stays constant at about 6 inches from the tip of the lens to the subject. 4) Magnification: Comparing the images shot of the ruler below by counting pixels, the increased magnification with the addition of the teleconverter is around 1.8x. ©Michael Ng 2006 |
 At 1:1 without TC17EII |
 At 1.8:1 with TC17EII |
| comment | share |