Hi guys, and thank you so much in advance for whatever help you can share with me. Sorry for the silly question, but I am confuse about this and I would like that somebody clear it up for me and plain explain the formula / technique or steps to follow to select the sharpest aperture. Maybe this is not relevant but I do have a D300 ( Nikon 16-85 mm and 70-300 mm VR ). I have made some investigation about this and there are some formulas to apply to select the sharpest aperture. Is there any simple way to find out which aperture is the sharpest without having to apply math to get the result ? I am not bad at math, I am just simply saying that there should be a quickest way to do this so if anybody would like to share that info with me, please do it and I will really appreciate it. Sorry again to ask this silly question but I am inclined to details and exact and clear information. I know that I have to focus on the farthest thing I want sharp and then on the closest thing I do want sharp but how do I calculate the distance for both to finally calculate the sharpest aperture ? Do you need to be in A mode or M ? How close to the closest thing you need to be to apply this ? Where do you need to focus ? 1/3 ahead or 1/2 ahead of the closest thing ? Sorry again to bother you with this question but I am not a pro but I am looking forward to be close to it some day. Can you help guys ? Thank you so much again for all of your help and please forgive me for this silly question !!