Question about Cameras
Can you use a Sakar MC 2X n/afs lens on a vibration control lens?
Will you have full function?
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Posted on Jan 02, 2017
A 2X adapter is an item attached between your lens and camera body. It's AF (which is good) and N (most likely a Nikon).
They make what ever zoom lens 2X the focal length. So a 135mm becomes a 270mm. So you get a bigger tele lens. They add extra glass, so the image is not as good without it, they eat up an F/stop. So outdoors in bright sunlight, no problem. It's shady and you have ASA 200 and you are going to have a slow shutter speed that can cause blur. Plus the viewfinder gets darker due to the extra glass. So in dim light, it may not AF and be hard to manual focus.
Posted on Jul 27, 2009
SOURCE: quantaray 2x AF for Nikon
A 2x tele-extender will rob you of two stops of light. This is simply a matter of physics: you're looking at only one quarter of the scene, so you'll only get one quarter of the light.
You specified neither the camera body you're using nor the lens you're using the tele-extender with. Most Nikon bodies will not autofocus with lenses slower than F/5.6. (Actually, they might, but F/5.6 is what Nikon specifies.) With the two-step penalty, a lens would have to be F/2.8 or faster in order to autofocus.
The solution is to either get a faster lens ($2000 or so) or to switch off the autofocus and go manual.
Posted on Feb 05, 2010
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