11-27-2010, 04:16 PM
I just purchased the Tamron 70-300 VC yesterday and did some test shots today to compare to my Nikon 70-300 VR. I did both tripod mount and handheld. Aperture mode on a D7000, from f5.6 - f8 at 300mm. Under every condition, the Tamron was visibly sharper. However, it was also underexposed by about one stop compared to the Nikon.
I know this is just the opposite of what others are reporting on this forum. When I originally tried the Tamron vs the Nikon at the camera store on a D7000, I got the same result - the Tamron was underexposed (this was not my D7000, my Nikon 70-300, or the copy of the lens that I purchased).
I then ran a second test in shutter mode. The exposures were very close, but the autoexposure aperture that was selected by the D7000 was one stop different. Tamron reads f8.0, Nikon reads f5.6 The images were both properly exposed.
I know this is just the opposite of what others are reporting on this forum. When I originally tried the Tamron vs the Nikon at the camera store on a D7000, I got the same result - the Tamron was underexposed (this was not my D7000, my Nikon 70-300, or the copy of the lens that I purchased).
I then ran a second test in shutter mode. The exposures were very close, but the autoexposure aperture that was selected by the D7000 was one stop different. Tamron reads f8.0, Nikon reads f5.6 The images were both properly exposed.