coco60
lvl.4
Flight distance : 632096 ft
Canada
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Landbo Posted at 2018-8-19 10:49
Ok with the second part of your question. How large area (how many meters) you will be able to say you getting focus depends on the aperture position. The more open the aperture is the shorter is the area (in meters) you can say you have focus. That's why I'm writing you need to practice to fly your quad and at the same time adjust the lens focus. When you shoot at night you will usually have the aperture fully open, thereby keeping the exposure time down.
Please read here, especially section 3: https://en.wikipedia.org/wiki/F-number#Effects_on_image_sharpness
Thanks for the link Landbo. My question was for night videos. As you said opening up diaphram to f2.8 means minimum focus. No choice since increasing ISO creates noise !! I meant focusing at an object 300m away, tapping on the screen for focus point still does not look sharp at night !? |
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