In past threads I have mentioned that I thought that the main manufacturers have not taken advantage of the DX format and made faster lenses... the rebuttal has that there is no way thy can do it .. its just physics .. of course me not being a lens designer cant prove my hunch but I pointed to the third party manufacturers who have been providing some of these lenses . eg the tamron 60mm F2.0 macro and sigma's new 18-35 F1.8.
Now there is further proof that the they have indeed been hamstringing the DX line of lenses. The metabones 0.67 adapter for the nikkor to Fuji X proves that its possible( and simple ) to make DX lenses with 1 stop advantage and the fact that they have been making DX lenses with 1 stop disadvantage is just the marketing types again putting artificial constraints on products (By 2 stops !)
( PS : :-) happy that my hunch was right !)
Moments of Light - D610 D7K S5pro 70-200f4 18-200 150f2.8 12-24 18-70 35-70f2.8 : C&C very welcome!
Being a photographer is a lot like being a Christian: Some people look at you funny but do not see the amazing beauty all around them - heartyfisher.