Are Kenko teleconverters good?
At the widest lens aperture (f/2.8 on the lens, f/8 effective) sharpness is good in the centre but less impressive at the edges. The edges gets better one stop down….Kenko Teleplus PRO300 2x DGX: Performance.
| Click on the thumbnails to view high resolution images | ||
|---|---|---|
| 180mm f/16 | 180mm f/22 | 90mm lens on its own |
Is a 1.4 teleconverter worth it?
Increased focal length The first and the most obvious advantage is that teleconverters give you more focal length. After all, that’s why we use them. The 1.4x gives increases focal length for 40%, and the 2x doubles it. So, you can turn 600mm into 840mm with the 1.4x, or 1200mm with the 2x.
Does a teleconverter affect autofocus?
So can I still autofocus with a teleconverter? In the question that prompted this article to be written (a Canon 100-400 f/4-5.6 and a 1.4x teleconverter), the answer is no. Autofocus will not work, or at least will not work well.
What does a 3x teleconverter do?
Since adding a converter on top of a lens always reduces optical quality, normally only the last three quarters of the combined focal length (i.e., 167mm – 345mm) will be used….Technical Data.
| Item | Technical Data |
|---|---|
| Magnification | x3 |
| Combined focal length | 345mm (35mm equivalent) |
| Combined max. aperture | F4.0 at tele side |
How many stops do you lose with a 2x teleconverter?
2 stops
A 2x teleconverter loses 2 stops of light, so an f/2.8 lens drops down to a wide aperture of f/5.6.
Do teleconverters work with zoom lenses?
In general, wide-angle prime and zoom lenses are not compatible with teleconverters; which makes sense, since you’re using a teleconverter to increase your reach—and you’d likely start out with a longer focal length lens to begin with.