#5634964 - 04/27/1211:31 PMRe: Image Evolution
[Re: Hard Times]
jesbrokenjesbroken
I was posting here when you were in diapers.
Registered: 12/26/06
Posts: 3476
Loc: West Virginia
I am certainly no one to listen to regarding photography, but my opinion of the three pics you posted of the gold coin is fervently in favor of the halogen(just in this instance). The coin exudes richness of color whereas the other two seem washed out and not brilliantly displayed as the halogen photo appears to me. JMO Jim
Registered: 01/28/02
Posts: 5681
Loc: Western Washington
I have a question? I am really no body's coin photography expert and am curious? I am trying to remember my old photography books which I do not have anymore to refer to. If I remember correctly, halogen light causes hot spots because it is coherent light not scattered (atactic) and because it has more lumen power per watt? This would effectively expand the zone dynamics by a couple stops or so at the white end.
Would mean that in order to use this higher lumen count light source, you have to be scattering (guass filter) this light source or be depolarising it? By doing this, would you get the high Kelvin temperature light source spectrum without the burn out spots from zone expansion? Just curious?
RWBRWB
FACT if I stop posting, trillions and trillions of transistors would be out of work.
Registered: 01/03/05
Posts: 4504
What you have not mentioned is the diameter of each light source in relation to the coin.
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Author of “Renaissance of American Coinage” (NLG Book-of-the-Year 3 years in a row) series and “Guide Book of Peace Dollars,” NLG 2011-Best Software: “Annual Assay Commission, United States Mint, 1800-1943,” and “Silver Dollars Struck under the Pittman Act.” Federal Court-approved numismatic expert. Contributor to the Red Book, Judd Patterns and many other fine numismatic books, discoverer of two gold patterns, and author of numerous coin research articles.
RWBRWB
FACT if I stop posting, trillions and trillions of transistors would be out of work.
Registered: 01/03/05
Posts: 4504
Light source diameter includes the reflector. Also, you have to include the distance of the light from the coin to determine if changing a light source actually does what you're thinking it will do.
_________________________
Author of “Renaissance of American Coinage” (NLG Book-of-the-Year 3 years in a row) series and “Guide Book of Peace Dollars,” NLG 2011-Best Software: “Annual Assay Commission, United States Mint, 1800-1943,” and “Silver Dollars Struck under the Pittman Act.” Federal Court-approved numismatic expert. Contributor to the Red Book, Judd Patterns and many other fine numismatic books, discoverer of two gold patterns, and author of numerous coin research articles.
Hard TimesHard Times
The Post-man always rings twice. Uhm... ring ring?
Registered: 01/16/10
Posts: 1604
Loc: Tejas
Here is another NEWP, still continuing to use the CFL's. Three lights at 45, 180, and, and 315, this configuration lights up the complete surfaces with no dark spots. This one was in the recent ANA auction by SB. It is part of the David Davis collection, which was nearly complete for die varieties. Mr. Davis was one of 5 authors of the book - Early United States Dimes - 1796-1837. These days if you can find a copy of this valuable book for under $150, grab it. It has documented all of the die varieties, 1 more has been found since it was published in 1984. That is how thorough they were.
Best, HT
Edited by Hard Times (09/01/1207:06 PM)
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