What a disappointing situation with the 17mm lens! Why?

Started Sep 2, 2013 | Discussions thread
texinwien
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False Dichotomy
In reply to slimandy, Sep 2, 2013

slimandy wrote:

Paul De Bra wrote:

Lenstip gives sharpness figures of 65 / 53 for the 17mm versus 75 / 68 for the 25mm lens (just as an example). Photozone gives figures of 2832 / 2134 for the 17mm versus 3075 / 2213 for the 25mm lens. That is a much smaller difference. (We cannot compare with other lenses such as the 20mm on photozone as their tests of these lenses were done on a different camera. We need tests on the same camera.)

This example shows just how dangerous it is to rely on a review site instead of actual experience from actual users. Lenstip makes the 17mm look bad compared to the other lenses (I also looked at figures of other lenses than the 25) but on Photozone the 17mm looks close to what the very well regarded 25mm lens does.

If the 17mm lens was much worse than the 20mm or 25mm people wouldn't be jumping up and down about how good the 17mm f/1.8 is. Don't just believe numbers. Try to get some real experience, with a good copy of the lens.

Careful. I got slated for that kind of logic. We want science in this forum, not common sense. We want MTF, not art.

Science is important where the rubber of artistic vision meets the road of the physical world.

If my artistic vision is to record a panoramic photograph of a mountain range with a certain degree of sharpness and detail, I can either ignore the measurements and buy lenses randomly, hoping I (eventually) stumble upon the one that will allow me to turn my vision into a physical reality, or I can study the professionally-collected measurements and choose the lens that performs best for my artistic purposes.

And I'll get slated again......

You are suggesting a false dichotomy. The presence of science and measurement does not inevitably obviate existence or creation of art. Some of us have exact requirements for the art we wish to create, and we carefully evaluate the tools available to us, in pursuit of those tools that are most likely to help us record our artistic visions.

It is unclear to me why you or anyone else would have a problem with that fact. Mind your own business  art, why don't you, and you'll probably get 'slated' a lot less often.

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