Last week review 45/2014

Post update on 14.Aug.2016

Last week review 45/2014 and we have beautiful weather at least talking about November 😉

In my comparism between the Canon 17-40/4.0 L and the EF-S 10-18/4.5-5.6, which i bought not long ago for the Canon 7D, i noticed that depth of field with an object distance of 1 m and f 5.6 didn’t result in an overall sharp image, like any depth-of-field stated. Since i didn’t measure the object distance exactly in the comaprism i tried it again.

Last week review 45/2014Therefore i discussed in my article, if the DOF tables or the programms or apps calcute right. To foreclose the results, too me the depth of field calculation aren’t working out. Even with an exact object distance of 1m i didn’t get an image being sharp in the backgorund, even when i used f 8.0.

Til now i didn’t notice this, because i use full format and taking landscape images i close the aparture to f11 or f16, since i don’t have to fear blurs by difraction. Taking landscape pictures i won’t rely on those apps. This result also has an effect calculating the hyperfocal distance, which cannot be right.

I can’t answer the question about the reason for this effect, maybe the definition of the circle of confusion is too gnenrous in digital photography, because you view images in 100% view a lot more often.

Next week we will another Microsoft patchday, hope this will not cause any problems 😉

As i wrote last week i registered in the new social network tsu.co, but its to early to state any experiences. You can use this link as a invite link, if you’re interested.

I hope that some of the articles on this blog gained your interests and i look ahead to your comments/suggestions. And don’t forget, i installed a feed for you via feedburner . So have i nice weekend, til the next time.

ciao tuxoche

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