From: Paul Furman on
Peter wrote:
> Jack Sprat wrote
>
>> I've tried a 25 year old Kiron 2X teleconverter with Nikon mounts on
>> my new Nikon D3000 DSLR and Nikkor 55 to 200 zoom lens and I've got a
>> problem. On manual mode I can adjust the shutter speed but have no
>> control over the aperture.
>>
>> Anyone know of a fix for this? Any help would be appreciated.
>
>
> There may not be. The D3000 has electronic contacts. The old
> teleconverter you have does not. I do not know if your converter is AI.
> If it is not AI you are SOL. Also I do not know whether you camera has a
> setting for non-cpu lenses. You should check your manual for that
> information. If it does, you will have to use that setting. If not, you
> are SOL.

I'm surprised it doesn't work. The aperture is not electronic like
Canon, just a mechanical lever that any teleconverter or extension tube
should have to relay that to the lens. Apparently they disable it in the
firmware? You would need electrical contacts to autofocus and meter but
the aperture should work.


> BTW you may find this information interesting:
> http://www.mit.edu/~cai/nikon/kiron2x.html


--
Paul Furman
www.edgehill.net
www.baynatives.com

all google groups messages filtered due to spam
From: Peter on
"Paul Furman" <paul-@-edgehill.net> wrote in message
news:hji68p$gtg$1(a)news.eternal-september.org...
> Peter wrote:
>> Jack Sprat wrote
>>> I've tried a 25 year old Kiron 2X teleconverter with Nikon mounts on
>>> my new Nikon D3000 DSLR and Nikkor 55 to 200 zoom lens and I've got a
>>> problem. On manual mode I can adjust the shutter speed but have no
>>> control over the aperture.
>>>
>>> Anyone know of a fix for this? Any help would be appreciated.
>>
>>
>> There may not be. The D3000 has electronic contacts. The old
>> teleconverter you have does not. I do not know if your converter is AI.
>> If it is not AI you are SOL. Also I do not know whether you camera has a
>> setting for non-cpu lenses. You should check your manual for that
>> information. If it does, you will have to use that setting. If not, you
>> are SOL.
>
> I'm surprised it doesn't work. The aperture is not electronic like Canon,
> just a mechanical lever that any teleconverter or extension tube should
> have to relay that to the lens. Apparently they disable it in the
> firmware? You would need electrical contacts to autofocus and meter but
> the aperture should work.
>

Yes it should, if the TC is AI and the lens not a G.

--
Peter