Using teleconverter

12 years 3 weeks ago #214301 by pspshoots
I am using a 2x teleconverter with my nikkor 70-300mm lens and Auto Focus does not seem to work properly. The lens tries to focus, but never able to. tried at different light settings. and still the same. Is it a problem with my converter or is it like that all the time ?

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12 years 3 weeks ago #214308 by crystal
It is known, that teleconverters do not focus (or can focus, sometimes). Depending on the lens you have, depending on the teleconverter you have, all depends if it will focus or not. Most of the time you have to manual focus. Also some lenses can not take a teleconverter.

Are you using a nikon teleconverter? Because in their list of compatiblity, there is no 70-300mm listed.
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12 years 3 weeks ago #214310 by pspshoots
Not a nikon one. Promaster 2x teleconverter.

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12 years 3 weeks ago #214351 by Nod
With a 2X TC, your 70-300 has a max aperture of f7. If you're in really bright sunlight, it might auto focus but if it's shady you'll have to focus manually. I've used mine with a 70-300 but again it has to have a LOT of light to work. Just focus manually and you'll be fine.


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12 years 3 weeks ago #214359 by chasrich
The only thing I have ever heard of was low light causes teleconverter to not find a focus. In the 300mm range this might be even more the case.

“Amateurs worry about equipment, professionals worry about money, masters worry about light, I just make pictures… ” ~ Vernon Trent
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12 years 3 weeks ago #214375 by robbie
Tried the 70-300 VR with a 1.4 TC for birds inflight the image quality wasn`t good enough for me to use but I know one person who shoots with a 2X.
Had enough light at the required f8 due to you losing 1 stop of light[5.6 to 8] with a 2X minimum f-stop becomes F11.Some lenses will not autofocus below a certain f-stop.


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12 years 3 weeks ago #214378 by pspshoots
I was shooting the moon at night :),,, tried now with day light and it does a good job. yes image is less sharper than one from the lens itself.

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