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Old Jul 18, 2005, 2:01 PM   #1
Join Date: Jun 2003
Location: Savannah, GA (USA)
Posts: 22,370

Does anyone know where I could seeMTF charts for this lens (Tamron SP 28-105mm f/2.8 IF LD Aspherical Autofocus Lens).

The numbers don't look sogood wide open with this one (the Tamron SP 35-105 f/2.8 looksbetter wide open compared to the newer 28-105mm f/2.8 ) at photodo.com. They're not a lot better stopped down.

But, I'd like to see the charts (and photodo.com doesn't have them for this lens, they only have the numbers):


It's difficult to judge a lens using just the numbers with Digital (because MTF ratings are looking at measurements that go beyond the crop factor area of a lens, and contrast/sharpess sometimes drops off abrubtly).

So, you need the charts (versus just the numbers) to see how well it's going to work in the "sweet spot" for a DSLR using a sensor with a crop factor, compared to just the numbers sites like photodo.com publish (although they do have the charts for some lenses).

Of course, you need more than just charts to judge a lens, too. :-)

JimC is offline   Reply With Quote
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