Understand that the lenses you mention use different focusing methods.
While they are VR lenses, the 24-120 is an "S" type lens, using the in-lens
focusing motor and requiring the teleconverter to have the required
electronic contacts to communicate with the camera body.
The 80-400 is also a VR lens but has no in-lens focusing motor (it is not an
"S" type lens) but uses the mechanical connection to the body. The AF
bodies all carry an in-body focusing motor to drive all the normal AF
lenses. No Nikon teleconverter has the required drive shaft to transmit the
rotational motion of the in-body focusing motor to the lens. Some off-brand
teleconverters do however.
All the "S" type teleconverters (TC 14E, TC 20E and their "II" derivatives
and the TC 17EII) have the required electronic connections to enable AF and
VR. The change in light transmission after adding them to a lens might
impede AV or VR operation, but that is another issue.
Bob
"paul" <paul.TakeThisOut@not.net> wrote in message
news:au6dnfO3QOLLUkPcRVn-ow@speakeasy.net...
>C J Campbell wrote:
>
>> paul wrote:
>>>
>>>The VR 24-120 & 80-400 don't work with a teleconverter because the glass
>>>is too slow as I understand. The AF-S VR 70-200mm f/2.8G IF-ED is
>>>supposed to work well with the 2x TC-20E II teleconverter, I think.
>>>
>>>Can you tell me what the new 1.7x model is, I'm curious.
>>
>>
>> The TC 17E II
<font color=green> >> <a style='text-decoration: underline;' href="http://www.nikonusa.com/template.php?cat=1&grp=5&productNr=2151</font" target="_blank">http://www.nikonusa.com/template.php?cat=1&grp=5&productNr=2151</font</a>>
>>
>> Nikon's site says that this teleconverter is supposed to support VR.
>> Nikon
>> does not say that about the other teleconverters.
>
>
> Hmm looks the one I mentioned does kill VR, thanks for pointing that out.
> This one is an inch shorter and $50 more at $400. It reduces f-stop by 1.5
> versus 2 stops. It also will not work on the VR 24-120 or the VR 80-400 so
> the only VR that benefits is the $1,500 AF-S VR 70-200mm f/2.8G IF-ED.<!-- ~MESSAGE_AFTER~ -->
>> Stay informed about: Nikon lenses?