Just a thought, get a refurbished by Canon 5D from Adorama, about $2000. The refurbished has had "hands on" by Canon and will offer better QC than brand new. Also the 5D has larger pixels than the 5D Mk II for what I think is better IQ. As for glass, a lens that works well on a 1.6 may show signs of edge darking on a full frame (some of the light from the lens goes around the edges of the sensor on the 1.6 crop body but all of it hits the sensor an a FF body. This is why you have the 1.6x effect. You might look into the 70-200 f4 IS which has excellent IQ and IS ( I use one of these on a 5D) for about $1100 at B&H or Adorama or if your interested in primes a 200 f2.8 which is one of the sharpest pieces of glass Canon makes. About $700 I think. With this,you could get a 1.4x II Extender (about $300) and still be close to your budget. Both of these lenses will work well on the 5D. The 5D has 9 selectable AF sensors. All are 5.6 sensitive and the center AF point is 2.8 sensitive. This gives you very accurate and fast auto focus with glass that has amax. aperture of 2.8 or less (wider), your 50 f1.8.


This image was shot with a 5D, ISO 500, Av mode, 1/8000 (as fast as it goes) with the 200 2.8, 1.4 II Extender (280mm on the 5D). The car is between 75 and 90mph. You can read the gauages inside on a large image.


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This image is not cropped. I shot it this way.


JeffersonPoster