FX -vs- DX lens Question.

[johnnyflash]

Hi all,

I'm currently the owner of a 18-200mm VR DX and Nikon D80.
I know that the sensor crop on the D80 is around 1.5x but my question is this.....

I'm looking to buy a 70-200mm F2.8 Nikkor (FX) for sports photography. Will this give me an equivilant range of 105-300mm f2.8 on the DX format D80?

If so, is it worth keeping the 18-200 VR as an all rounder or should i plan for something with FX capability and a shorter range.

I will (at some stage when the bank balance recovers) be trading my D80 for the beautiful D700 and I want to buy glass that will suit an FX format camera.

J.

 

[Monkey]

The crop factor relates to Field of view, not focal length.

The lenses are all labeled with their optical focal length, so the 70-200 wont give you any more length than you already have, but will give you a HUGE increase in IQ.

Buy the 70-200, then buy a 17-70 / 18-70 range lens with better optics.

 

[RobH]

I'm not great technically, however, i do know that on a full frame sensor, you get the actual focal length.

Rob.

 

[StewartR]

Focal length is focal length is focal length. FX or DX doesn't make a difference.

So the 200mm of an 18-200 DX and the 200mm of a 70-200 FX are the same.