Simple test to test lens sharpness.

Are there any simple tests to check sharpness of the lens similar to focus tests using batteries. Bought sigma 17-50 from ebay. Need to check lens withinn 30day ebay guarantee. Focus seems to be fine.

17mm 2.8

IMAGE LINK: https://www.flickr.com​/photos/khwaja76/13360​007675/

IMAGE LINK: https://www.flickr.com​/photos/khwaja76/13359​907525/

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Take pics and see if you're happy with them?

Some pics taken so far.

17mm 2.8

IMAGE LINK: https://www.flickr.com​/photos/khwaja76/13160​438415/

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WhyFi wrote in post #16779946
Take pics and see if you're happy with them?

Thanks Bill. Took some pics. Looked fine for me.

That lens seems to be great. Sharp across the image.

I agree, see if you're happy with them. Seems to be a sharp copy to me.

Thanks Aronis and trewyn15. Sigma lottery posts little scared me without warranty to fall back on later.

Sweet..

Heya,

Simplest thing is to just take images. Go outside, shoot at F2.8 and check center sharpness. Then stop down to F4 and do the same on a complex image, like trees. Do the same at F8. I wouldn't bother checking sharpness past that, as it should be very sharp. The point is to see if it's sharp wide open and if not, where it gets sharp.

The bottom line is though, if it's sharp enough for you to look at your own images and you cant tell if it's sharp or not, then it's sharp enough for you.

Very best,

Pix looks clean and sharp

great colours!

yogestee wrote in post #16781951
Sweet..

Thanks Jurgen.

gforce240sx wrote in post #16782028
Pix looks clean and sharp

Thanks man.

UniverseUV7 wrote in post #16782991
great colours!

Thanks Universe. IS is very helpful.

MalVeauX wrote in post #16782009
Heya,

Simplest thing is to just take images. Go outside, shoot at F2.8 and check center sharpness. Then stop down to F4 and do the same on a complex image, like trees. Do the same at F8. I wouldn't bother checking sharpness past that, as it should be very sharp. The point is to see if it's sharp wide open and if not, where it gets sharp.

The bottom line is though, if it's sharp enough for you to look at your own images and you cant tell if it's sharp or not, then it's sharp enough for you.

Very best,

Thanks Martin. I will take some pics outside with tress and check it out.