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| Re: Tamron announces 150-600mm Ultra-Telephoto Zoom Lens |
That MTF chart looks very good to me for a zoom. The 10mm lines give us a measure of contrast, the 30mm lines a measure of sharpness. Sagittal lines mean radial and Meridional mean circumferential. The good thing is it looks pretty good at 600mm.
here\'s the Sigma 50-500/150-500 MTF\'s for comparison. It looks like the Tamron is beating those two out. based on what my friend was showing me with his 50-500, which I was already surprised at how good it was, this might be a pretty darn good lens. Let\'s wait and see if the real world analysis backs this up.
I should add the fly in the ointment for the Tamron could be the bokeh at 600mm. The wide separation between the sagittal and meridional lines at 600mm could mean a harsher bokeh. usually good bokeh comes when these lines are closer together. it doesn\'t seem worse than the 150-500 however, so that may be a reference point.
Ah ok here\'s the Canon 100-400L MTF curves (note twice as many curves as it got two apertures measured)
Based on this alone the Tamron would be seen to be in with a good chance of being a good lens. It\'s bokeh doens\'t look like it\'ll be any worse and I\'ve never complained about bokeh on my 100-400L