Hi,
It's very hard to say by how much, and whether or not it's enough to forego
the flexibility of a zoom. What I know is that I like sharp photos with a
lot of details...
I've taken three different sets of pictures outside on a street, on a
tripod, with both lenses, wide open and at f/8, that were all enlarged to 8x12.
There were forms and there was text, such as addresses and restaurant menus
on the wall.
The forms (buildings, cars, etc) are similar looking with both lenses, but
the text is always easier to read when taken with the 20/2.8 at f/8. This
makes the pictures more interesting to look at because of the added
readability. You don't have to squint to read. The letters seem tighter and
seem to have more contrast, which makes them easier to read.
Wide open, strangely, the picture is muddier with the 20 than with the
20-35, but at the same time text is easier to read...!!! Try to explain this...
Closed down to f/8, everything is easier to read with the 20mm lens. The
difference can be seen easily on an 8x12 without using a magnifier, even if
it's slight.
Pierre
At 19:53 3/6/2001 -0500, you wrote:
> > I'm now favoring the 20/2.8 because my informal tests (consisting of
> > getting 8x12s made from identical pictures made with both lenses) show it
> > to have higher resolution at f/8.
>
>By how much? Is it enough to forego the flexibility of a zoom?
>
>While I don't doubt the quality from a prime lens is almost always better
>than a zoom at the similar focal length (I've seen examples of a 20 years
>old consumer grade 50 mm prime lens generating image quality that made my
>jaw drop), just make sure you are not paying for that last 5% of quality
>improvement by negating all the other benefits of the EF20-35 f3.5-4.5.
>
>As if you don't need more opinions to influence your tug-of-war decision
>process.....
>
>Regards,
>
>Ken (who bought the EF20-35 last May without ANY hesitation or ANY pondering
>for my ride with Snowbirds formation flight, I knew that was the lens and
>have never regretted the decision. On the other hand, I have been agonizing
>myself for the past 2 months on which high performance tires to get this
>summer, but that's another story for another forum)
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