CR88
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- May 18, 2009
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- #16
Keep in mind that a FX lens has larger elements to create a larger image circle.
DX lenses, because they are ONLY used with smaller sensors do not have to have as large elements, thus use smaller elements to create a smaller image circle for the smaller sensor.
Caveat ... there are some DX lenses that create an image circle that is suitable for an FX. But in general, if you use FX lenses the DX sensor is going to get the "sweet spot" of the FX image circle and technically should be better than the equivalent DX lens.
Because the DX lens uses less glass, it will cost less (in general). If anyone made a 24-70/2.8 in a FX and DX version at the same quality standards, and economies of scale were exactly the same, (same number sold in the same timeframe, etc) then the DX lens should cost less based on the less high quality optical glass being used. Thus the reason DX lenses are cheaper .. plus they may not use the high end glass, and use cheaper materials, cheaper designs, etc to actually cater to the lower end market in price/performance.
as to the D600/D7100 issue.
At one time I really contemplated getting the D7100 vs the D600. Though I needed the FOV of the FX so I bought it. I too noticed the image quality difference. Thus I barely used my D7000 before selling it.
Now I added the D500 and I immediately noticed an image quality problem. BUT, in experimenting I've also learned that if I double my Shutter Speed the image quality jumps up dramatically.
So if I were to take a shot on my D750 at 1/1000, on the D500 I just do it at 1/2000.
Awesome info, thank you. So on the 500, are you saying that the quality difference was diminished enough that a 500 would have been an alternative to purchasing the 750? Personally, I love the feature set, build and ergonomics of the 500 I just thought that FX was direction I wanted to go. I recently ran across a Nikon Refurb 500 for not much more than I paid for my 750.