Bob, go for it. It doesn't bother me the least. I actually hope you can prove the Sigma is as good as the Nikon 200-400. Maybe I'll buy the Sigma also.
You do understand the way these long lenses (300mm +) generally work? You pay $600 for a lens and then $1,200 for another lens and you will get a big upgrade in IQ. Now spend $2,400 on another lens and you will probably get ~1/4+ of the IQ increase of the first upgrade. Spend $4,800 on the next lens and it's 1/8. Get into $9,600 and it's less still.
It's not a linear scale for IQ based on the money spent. After a certain point it's mainly based on the lens speed vs focal length plus throw in build quality.
Besides all that, your comments were about the Nikon 80-400 vs the Sigma 150-600 and that was where you were challenged. Your goal of challenging the 200-400 is quite ambitious considering you haven't shown it's better then the 80-400 and the "data is all over the internet".
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I'm a photo hacker. I use my expensive equipment to destroy anything in front of my camera. This is a special skill that can never be realized by low life photographers. A nurtured skill since the 1970's.
You do understand the way these long lenses (300mm +) generally work? You pay $600 for a lens and then $1,200 for another lens and you will get a big upgrade in IQ. Now spend $2,400 on another lens and you will probably get ~1/4+ of the IQ increase of the first upgrade. Spend $4,800 on the next lens and it's 1/8. Get into $9,600 and it's less still.
It's not a linear scale for IQ based on the money spent. After a certain point it's mainly based on the lens speed vs focal length plus throw in build quality.
Besides all that, your comments were about the Nikon 80-400 vs the Sigma 150-600 and that was where you were challenged. Your goal of challenging the 200-400 is quite ambitious considering you haven't shown it's better then the 80-400 and the "data is all over the internet".
--
I'm a photo hacker. I use my expensive equipment to destroy anything in front of my camera. This is a special skill that can never be realized by low life photographers. A nurtured skill since the 1970's.
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