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i put my 70-210
Old 10-30-2003, 11:35 PM   #1 (permalink)
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2.8 lens with a 2x doubler...on my NEW D100 ... and it still read as a 210..and with the lens on and no 2x..it said 3-3.5 instead of 2.8 ???? [img]/ubbthreads/images/graemlins/confused.gif[/img]
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Re: i put my 70-210
Old 10-31-2003, 08:16 PM   #2 (permalink)
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Just a guess, I don't think the doubler sends any info back to the camera. So it [the camera chip] will "read" the chip in the lens, e.g. 70-210. With the extra glass in the doubler, I don't think your going to get 2.8. My Fuji does the same thing. I wonder if it's making some adjustments, regardless of the camera settings.

FWIW.

-mp
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Re: i put my 70-210
Old 10-31-2003, 08:49 PM   #3 (permalink)
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with that 2x teleconverter the lens is no longer a 2.8 as far as light is concerned. You lose 2 stops of light with the 2x, you lose one stop with the 1.4.

Why the camera said 3-3.5 I don't know.

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Re: i put my 70-210
Old 10-31-2003, 09:01 PM   #4 (permalink)
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i would expect the light loss 5.6 f stop...but was just kinda weirded out with the camera reading 210..when it would be 420 on the f100...it makes me wonder if the doubler even makes a difference... [img]/ubbthreads/images/graemlins/tongue.gif[/img]
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Re: i put my 70-210
Old 10-31-2003, 09:06 PM   #5 (permalink)
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thats why i was confused...i was expecting to see a reading saying 420 5.6 and not 210 2.8
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