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Auto-focus beyond f5.6 with D200

yndigegn

DK
79 posts

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yndigegn Registered since 23rd Jul 2006
Wed 20-Dec-06 08:45 PM

This post could have been a 3'rd party lens ( Sigma ) posting. And then maybe not.

I notice that many of you Sigma users are considering to upgrade the firmware from 1.0.1 to 2.0 to get the now well know AF-On knob to work for older Sigma HSM like lenses. I upgraded too.

Is there anyone of you who has noticed that your D200 did auto-focus with a x2 tele converter even if the lens was a slow f5.6 lens using the original 1.0.1/1.0 firmware ?

I have a Sigma 80-400 OS lens and the suitable Sigma x2 APO Tele Converter. That combo would auto-focus ( under static conditions ) even at 2x400mm and f2x5.6 ( = f11 ! ) with the original firmware 1.0.1/1.0 for the D200.

I don't know if other lens and tele converter combo's has the same capability. But I really would like to hear from your personal experiences in the unknown "beyond f5.6 auto-focus land".

Auto-focus can mean several things. But a basic requirement is that the auto-focus motor gets activated. So this situation is the interesting situation. Whether the motor is quick or slow and whether the focus is obtained or not is of course also interesting.

I have inquired Nikon whether it is possible to downgrade the camera again. But so far I have only had negative answers. One answer even claiming that it would require exchanging circuit boards.

Is the D200 with the original firmware a unique camera having this auto-focus capability ?

Best Regards
Yndigegn

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                         Reply message RE: Yes with Kenko Pro 300 1.4 - no with Sigma 1.4
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                                                  Reply message RE: Auto-focus beyond f5.6 - now electric contacts
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