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Not to stir any large debate here, but I do respectfully disagree with your assessment that because these lenses are made for full frame therefore they are better on full frame. Many of these lenses have known light-falloff (vignetting) issues with FX sensors. DX sensors are using only the sweet spot of 35mm lenses, the center, not the edges, so they provide superior quality images. Many of these older lenses work much better on DX. How many times has Bjorn downgraded a lenses number because of softness on the edges? With a crop sensor you don't have to worry about...Show more →
Agreed with Ray.
I have a D3 and a D7000, and my experiences with the D7000 did not revealed any dowgrading of a MF lens compared to the D3, on the contrary on some situations, as Ray has pointed out.
Of couse we need to be aware of the 1.5x factor, but imho no problem at all. Need a 20mm, use the magnificent 16mm/3.5; need a 28mm - the 20mm/2.8 or 3.5 do the job, and so on.
However, no doubt viewing/focusing is a little bit easier in a FX body and no need to calculate the effective FOV could be more confortable