![]() With a continuous light source, take a meter reading at wide open and set the exposure appropriately. You can use a aperture or a continuous light source the only difference will be how you adjust your exposures. Placing the light beyond 45 degrees to the side and a good distance from the newspaper is a good way to minimize the chances of glare, just like in traditional copy work. Position your light source so that it doesn’t cause lens flare or glare on the shooting area. ![]() All you need for the test is a tripod, any light and a newspaper. So, if you don’t have any specific depth of field needs, you’d be well served to simply set your lens to ƒ/8 and go from there, knowing you’re going to produce an image where the sharpest areas are really sharp.īut what if you want to know the exact sharpest aperture on each of your lenses? For that, you can do a simple test to determine for yourself, for instance, that your wide angle is sharpest at ƒ/5.6 and your normal prime and telephoto zooms may be sharpest at ƒ/11. All things being equal, those apertures in the area of ƒ/8 or ƒ/11 are going to be sharper than the apertures at the ends of the dial-both wide open (whether that’s ƒ/2 or ƒ/4) and stopped down (like ƒ/22 or ƒ/32). In practice, it’s different with every lens, but it’s always somewhere near the middle. That means on a lens with a maximum aperture of ƒ/2.8, the sharpest aperture is likely to be around ƒ/8. There’s an old photographer’s rule of thumb that states the sharpest aperture on a given lens can be found about three stops from wide open.
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