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| p.6 #2 · Tamron announces 150-600mm Ultra-Telephoto Zoom Lens |
Sy Sez wrote:
I'm suspect of the image quality of the lens, as the sharpest lenses currently available utilize one or more "superior" LD elements, such as Canon's Flourite, Sigmas FLD, & Tamron's own ELD.
Tamron's 70-200 2.8 contains 1 ELD, 4 LD elements, wile the 150-600 has 3 LD elements and "0" ELD.
It strikes me that Tamron is compromising image quality for price-point.
I wish they'd gone for a $3K price and superior image quality.
By the way, even the EF 100-400L has superior Flourite elements.
The sharpest lenses currently available are at an extremely high level, high above the Canon 100-400. The Tamron 70-200 2.8 you mention with 1 EDL and 4 LD elements has theoretical MTF at a very high level. It is clear from the MTF charts than Tamron did not aim at that level with the new 150-600. The spread in sagittal and meridional lines indicate that astigmatism and/or lateral CA is present. The MTF at the short end is only mediocre, but the good news is that it is higher at the long end. This indicates that it has been optimized for the focal length where most cheap zooms fall apart.
For the lens to be successful, the minimum performance mark is to beat the Canon 100-400 with a 1.4x teleconverter, or the Sigma 120-300 2.8 OS with a 2X teleconverter. That can easily be done even if it is not comparable to the sharpest lenses available.