The Sigma 600mm mirror can focus past infinity. I just tried this
combination with the 1.4X-A and 7mm ring. It fits, and the lens can
focus at least 100m away!
Hans
-----Oorspronkelijk bericht-----
Van: olympus-owner@xxxxxxxxxx [mailto:olympus-owner@xxxxxxxxxx] Namens
Darin
Verzonden: vrijdag 16 februari 2007 15:49
Aan: olympus@xxxxxxxxxx
Onderwerp: [OM] Re: OM Teleconverter 1.4xA?
Not that it makes much difference, but I'm working with a 600mm lens
rather
than 500mm. Actually, 35 meters would probably work for me at least 80%
of
the time. I'm not really looking for a longer reach, just tighter
framing
for small wildlife and bird photography. If that makes any sense? BTW,
what's the formula used to figure this kind of thing out? I'm sure I
could
find it in one of my photography books, but it's faster just to ask, if
it
isn't to difficult to explain.
Darin
Chuck Norcutt wrote:
> Forgetting about the TC for a moment, a 500mm lens set at infinity but
> on a 7mm extension tube should be focused at about 35 meters. The
depth
> of field at f/8 and 35 meters is less than +/- 1.5 meters on either
> side. The TC starts its magnification task from this point. Sorry,
> guys... time for plan B.
>
> Chuck Norcutt
>
> Darin wrote:
>> Actually, I was wondering the very same thing.
>>
>> Darin
>>
>> ----- Original Message -----
>> From: <usher99@xxxxxxx>
>> To: <olympus@xxxxxxxxxx>
>> Sent: Thursday, February 15, 2007 2:30 PM
>> Subject: [OM] Re: OM Teleconverter 1.4xA?
>>
>>
>>> Wonder how you would do with a 7mm ext tube between the lens and the
>>> very
>>> nice Oly 1.4 TC? Couldn't be too far from infin focus. I bet
someone
>>> on
>>> the list could determine the dof at infinity .
>>> Mike
>>
>
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