Focustest 17-40L

[Reservoir_Dog]

Hi all,
I have a 17-40L from yesterday, and i was testing it for back/front focus issues.
All pics are on this LINK (http://users.pandora.be/reservoir.dog/)
All comments much appreciated, did only autolevel and resized 50%

[slin100]

That's not a good chart to use. Use the chart with a flat, high-contrast object sitting on the chart, perpendicular to the lens. Make sure there is plenty of light.

What camera do you have? The results look acceptable for a non-professional camera.

[Reservoir_Dog]

That's not a good chart to use. Use the chart with a flat, high-contrast object sitting on the chart, perpendicular to the lens. Make sure there is plenty of light.

What camera do you have? The results look acceptable for a non-professional camera.

Its a 20D
Can u give an example about the test u mean? Dont know the word "perpendicular"...(i'm not english)

[slin100]

Look at this test.
http://www.canon-dslr.com/Canon_Jan05/Canon_SLR_Focus_Test.htm

See how the target is standing up? That's what you need to do. You can use your chart but put it under the target.

[Dante King]

Great info slin100!