Sharp, highly detailed pictures are what you’re after with coin photography. I’ll take pictures over and over until I get the sharpness I want. I want my pictures to show every little detail on the coin. Several factors work together to make images sharp or fuzzy. Focus is important to obtaining sharp pictures. You want the plane of focus right at the coin. This is why I like to make sure the coin is square to the camera. Any tilt of the coin or camera will put areas of the coin farther away from the focus plane and those areas will be less sharp.
Most cameras take the sharpest pictures with the aperture somewhere in the middle settings. Pictures tend to be a bit less sharp at the extremes of aperture settings, high and low. This is a relatively subtle effect and probably applies more to SLR’s than the hand held cameras because the SLR’s tend to have a larger range of aperture settings. The aperture can be used to increase the depth of focus by turning it to higher numbers. This won’t solve all focus problems but can help tremendously if you need to shoot at an angle. The drawback of a high aperture is longer shutter speeds.
Shutter speed is very important to getting sharp pictures. A fast shutter will help negate motion and vibration in the camera during shooting. In general, if you can get the shutter speed faster than 1/100 sec, the sharpness will improve. Faster shutter speed can be achieved by getting more light onto the coin. Turning the aperture to a lower number will let more light into the camera and will improve shutter speed. But, as we discussed earlier, turning the aperture to a lower number will narrow the depth of focus. This makes focus and shooting from straight-on all the more important. Motion can be reduced by using a copy stand or a tripod. Shooting coins handheld will invariably produce fuzzier images. The heavier the camera, the sturdier the copy stand needs to be to stabilize it.
QUESTION :
1. What is the topic of the passage ?
a. Shutter speed
b. Aperture settings
c. Determine of sharpness
d. Sharpness pictures
2. Which of the following would be the best title ?
a. Getting sharp pictures
b. Determinants of sharpness
c. Shutter speed
d. Factors to make images
3. The main idea of the paragraph 3 is ...
a. Shutter speed is very important
b. Shooting coins handheld will invariably produce fuzzier images
c. Shutter speed can support to photography
d. Shutter speed is very important to getting sharp pictures
4. Which of the following is statement TRUE ?
a. Turning the aperture to a lower number won’t narrow the depth of focus
b. The superiority of a high aperture is longer shutter speeds
c. The shutter speed faster than 1/100 sec so the sharpeness will improve
d. Shutter speed is not important to getting sharp pictures
5. The second paragraph talk about...
a. Aperture settings
b. The drawback aperture
c. Use aperture
d. The superiority aperture
Lighting for coin photography is all about contrast management. The following is a theory that I came up with a while back. It makes sense to me at least. I think that the eye and the brain like a certain amount of contrast within any image. If the contrast is too high or too low, the image won’t look right. It will appear either harshly lit or washed out. Therefore I try to get my images to have that happy amount of contrast that my eyes like. I stole the following concepts from the physics that I learned during my radiology residency. There are two determinants of image contrast: lighting contrast and subject contrast. Subject contrast is how much contrast is on the surface of the coin you are shooting. How much relief? How much luster? How glossy is the coin? How dark is the coin? I tend to break things down into three categories: Low, medium and high contrast coins.
Lighting contrast needs to be tailored to the coin being shot. Lighting contrast is controlled by various factors, the number of lights being the most important. As discussed above, the contrast of the lighting is inversely proportional to the number of lights. More lights = less contrast and vice versa. The angle of the lights also has a say in the resulting contrast. The higher the angle of the lighting, the less contrast it has (but better lit in general). The positives of high-angle lighting far outweigh the negatives, so I use it almost exclusively. I only use lower angle lighting to increase the contrast in the case of circulated coins and some extremely glossy coins to reduce glare.
Contrast can also be controlled by using diffusion on the lights. Diffusing the lights lowers the contrast. Diffusion can be achieved by placing a piece of paper or similar translucent material between the light and the coin. Commercially available “light domes” and “light tents” are sometimes useful for shooting coins. The main application of these in my view is shooting modern proofs. We have already decided that the eyes and brain like a medium amount of contrast in a picture. So therefore, a low contrast coin needs high contrast lighting to bring out what little contrast is present on that coin. A high contrast coin needs lower contrast lighting so it doesn’t look so harsh. Medium contrast coins like medium contrast lighting. I’ll give specific examples to follow.
QUESTION
1. Which of the following would be the title ?
a. Lighting Photography
b. Contrast Control
c. Contrast Management
d. Determinants of Image Contrast
2. The second paragraph talks about...
a. The superiority diffusion on lights
b. Contras control by using diffusion on lights
c. Use diffusion on lights
d. The drawback diffusion on lights
3. What is the subject of the passage ?
a. Decision-contrast picture
b. Contrast control in a picture
c. Lighting contrast
d. Contrast setting in a picture
4. The main idea of the first paragraph is...
a. Three categories contrast are low, medium, and high contrast coin
b. Therefore I try to get image
c. Lighting for coin photography is all about contrast management
d. There are two determinants of image contrast, lighting and subject contrast
5. Which of the following is statement NOT TRUE?
a. If the contrast is too high, the image won’t look right
b. Subject contrast is how much contrast is on the surface
c. If the contrast is too low, the image will look right
d. The positives of high-angle lighting far out
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