DarkFalcon
05-31-2006, 01:58 PM
I just want to offer tips for those who would like to maximize the potential for great photos. There are people who have just whipped out their point and shoot camera and snapped off a beautiful shot of their fish, but I think those are in the minority. If you look at all the blurry or poorly colored photos of fish, I do have problem sometime talking fish photography it not easy, You must willy to sit and wait for the right moment to come and take a shot. Bad or good pictures not mean they are hopless. My point of view, Photography are a work of "ART".
Do your best
Digital depth of field
To achieve the same field of view with the digital camera, its lens must have a focal length of one fourth of the 50-m lens, which is 12.5 mm. Now this equivalence is exactly true at infinity focus, but as the FOV changes with the object distance there is a slight difference in the FOV when the subject is at 3 m. The focal lengths might be finetuned to achieve exactly the same FOV at an object distance of 3 m, but this would not change the conclusions so we'll just stick with the nice value of 12.5 mm. In the light of a fair comparison we also want to consider eventual prints or screen displays of the same size, which implies that the digital image needs a linear magnification four times as high as that of the 35-mm image. Therefore, the allowed circle of confusion must be four times as small. For the 35-mm scenario we adopt the conventional 30-µm COC, for the smaller sensor we thus take 7.5 µm.
This is a picture of a goldfish, I took is using a Efs 18-55m len,
Setting ISO 400 or 800 ISO speed Aperture size 3.5 shutter Speed 1/100 with flash use a white paper to reflect direct flash
depth of field on the background make like 3D
http://i35.photobucket.com/albums/d164/clavinpan28/Ranchu20.jpg
Do your best
Digital depth of field
To achieve the same field of view with the digital camera, its lens must have a focal length of one fourth of the 50-m lens, which is 12.5 mm. Now this equivalence is exactly true at infinity focus, but as the FOV changes with the object distance there is a slight difference in the FOV when the subject is at 3 m. The focal lengths might be finetuned to achieve exactly the same FOV at an object distance of 3 m, but this would not change the conclusions so we'll just stick with the nice value of 12.5 mm. In the light of a fair comparison we also want to consider eventual prints or screen displays of the same size, which implies that the digital image needs a linear magnification four times as high as that of the 35-mm image. Therefore, the allowed circle of confusion must be four times as small. For the 35-mm scenario we adopt the conventional 30-µm COC, for the smaller sensor we thus take 7.5 µm.
This is a picture of a goldfish, I took is using a Efs 18-55m len,
Setting ISO 400 or 800 ISO speed Aperture size 3.5 shutter Speed 1/100 with flash use a white paper to reflect direct flash
depth of field on the background make like 3D
http://i35.photobucket.com/albums/d164/clavinpan28/Ranchu20.jpg