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Post by Ely Teehankee on Apr 15, 2010 1:23:42 GMT
I wonder if you would have gotten everything focus at f8 at that distance. Hi Ely, Stopping down to f/8 wouldn't matter much with such a combo and close shooting distance. Here are some DOF numbers at various apertures for a 700 mm lens on a 1.6 crop factor body, with a shooting distance of 5.63 m and assuming a maximum print dimension of 20"x30". Thank you Romy. So the further the subject the thicker f/5.6 - 4 mm f/7.1 - 5.3 mm f/8 - 6 mm f/11 - 8 mm f/16 - 12 mm f/22 - 17 mm f/32 - 24 mm f/64 - 48 mm Since the bird's head is easily 1" (25.4 mm) in diameter, I need to stop down to f/32 and beyond to take it all in focus. Of course, that will be way within diffraction territory, plus it would've required very high ISOs and slow shutter speeds. Thus, we need to compromise and just try to make the photo sharp where it matters (the eye area in this case) with a relatively wide aperture. Thank you Romy. So in this particular case you would a deeper DOF if the bird was further. A good lesson for me.
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Post by Romy Ocon on Apr 15, 2010 11:41:51 GMT
Thank you Romy. So in this particular case you would a deeper DOF if the bird was further. A good lesson for me. Yes, the following variables, singly or in combination, will result to deeper DOF: 1. Use a smaller aperture 2. Increase subject distance 3. Use a shorter focal length Here's a simple online DOF calculator that you can play around with, just input some variables and the DOF numbers are calculated: www.cambridgeincolour.com/tutorials/DOF-calculator.htm
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Post by Ely Teehankee on Apr 15, 2010 19:31:15 GMT
Thank you Romy. So in this particular case you would a deeper DOF if the bird was further. A good lesson for me. Yes, the following variables, singly or in combination, will result to deeper DOF: 1. Use a smaller aperture 2. Increase subject distance 3. Use a shorter focal length Here's a simple online DOF calculator that you can play around with, just input some variables and the DOF numbers are calculated: www.cambridgeincolour.com/tutorials/DOF-calculator.htmThis is really good. Even if you cant bring this with you when you go birding, its very good for understanding the subject. Thank you for the full course instructions.
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Post by Edu Lorenzo Jr on Apr 16, 2010 0:49:26 GMT
If I may add.. taking the subject's size and position into consideration is a great help also. When I was shooting pics of the bean goose, the second I saw its size I instantly thought F8 and above if it faces me and F8 will do if its body is parallel to the camera body.
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