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1964 D Kennedy Half Dollar RPM-002, FS-502 - Fighting With Lighting

 
 
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 Posted 10/24/2018  10:10 pm Show Profile   Check tropicalbats's eBay Listings Bookmark this topic Add tropicalbats to your friends list Get a Link to this Message
The bulb burned out in my studio light for coin photography. I have always used tungsten lights as they are well known to cameras and imaging software so can easily be corrected for to get accurate color.

But knowing that they are no longer produced, I decided to try and make the jump to a more modern light bulb. Ha! Been fighting all day with this Philips 10.5W LED 2700K bulb that is supposed to more or less mimic to soft color tones of tungsten. But all I get are yellow coins.

I will be changing bulbs depending on what I have here and what I might buy tomorrow, and using this rather nice RPM Kennedy as my test coin. It is a nice shiny MS grade coin and I plan on puttering around with the light source until I can make it look like it looks in hand.

Also of note, just having that light on in the backgrond when I shot the mint mark photo under the scope put a strong copper/yellow reflection along the edge of the branch, so it buggered up both full coin and close up photos.

The plan is to re-post more images of this coin in this thread once I change bulbs.

1964-D Kennedy half dollar RPM-002, FS-502







The first try at another bulb is waaaay better. This is a 72W 2900K halogen. Photos looked pretty close using auto white balance in the camera but jumped to almost right on with Photoshop's "auto color" correct. Shows that it is much easier to work with a light source that the software can deal with. My only problem here is that the bulb is very bright and hard to get the luster quite right, although possibly upping the f-stop would both fix that and give a stronger depth of field.






With reasonable success on the Kennedy, I wanted to test a Lincoln with the halogen as well. Same deal, with an auto color correct in Photoshop pretty much nailing it. I found this RPM a couple days ago and hadn't put it in the 2x2 yet so made for a spiffy test coin. Coin is toned pretty much as the photos show with just that overly yellow glare spot at the top of the head being out of whack.


1969-S/S Lincoln Memorial cent 1MM-008 (west)






Didn't want to quit until I gave LED another shot. This time I dropped in a 60W 5000K bulb and the world turned blue. So unless you like yellow or blue coins so far I don't have a good choice for an LED bulb. Thinking to go with the halogen since it does the job and maybe do some minor tinkering/changing to see if I can nail it down even better over the next couple days.

Here is the test coin under the 60W LED (color corrected, it was far more blue originally)





And since it is easiest to see what is going on in a side by side, here are the final results of my three bulb test. I think the choice is obvious.




Edited by tropicalbats
10/24/2018 11:25 pm
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 Posted 10/24/2018  10:44 pm  Show Profile   Check CoinCollector2000's eBay Listings Bookmark this reply Add CoinCollector2000 to your friends list Get a Link to this Reply
That's an amazing RPM! I hope you figure out the lighting issue...
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 Posted 10/24/2018  10:45 pm  Show Profile   Bookmark this reply Add jst1dreamr to your friends list Get a Link to this Reply
Nice find, congrats.
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 Posted 10/25/2018  12:29 am  Show Profile   Bookmark this reply Add coop to your friends list Get a Link to this Reply
Color and contrast can be adjusted to enhance or fix issue with a good software program.
Richard S. Cooper
Some have asked about my images I use and I'm glad to say, you can now you can see the DVD in sections on youtube:
1. Intro, older coins, toned coins 2. Doubled dies 3. Die events, One of a kind errors 4. So called errors, Coin information 5. Coin information Types and Varieties, Overlays
Jefferson nickel doubled dies Wexler/Rebar complete listings

trail dies:http://www.traildies.com/
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 Posted 10/25/2018  05:05 am  Show Profile   Bookmark this reply Add John1 to your friends list Get a Link to this Reply
I know that one drawback,if you consider it a drawback with Halogen is it shows every die scratch. TPGs use them to grade. I once used a 100 watt Halogen bulb to CRH,it was my favorite. It broke one day and I could not find a replacement anywhere.
John1
( I'm no pro, it's just my humble opinion )
Searched 5+ Million Cents Since 1971
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 Posted 10/25/2018  08:31 am  Show Profile   Check tropicalbats's eBay Listings Bookmark this reply Add tropicalbats to your friends list Get a Link to this Reply
John1, I do tend to agree. Halogen is a harsh light, and even minor nearly invisible marks on a coin can look like a key was dragged across it. This was always why I liked tungsten as it had more of a glow that still showed coin flaws but not to an extreme extent. I will need to do some images of circulated wheat cents to really see if that is a problem with this halogen, though, as they have a lot more minor dings and even a really nice one can look like the moon's surface under some lighting.

Coop that is an impressive graphic! I can edit photos but your skill with graphic creation is second to none. And your graphic demonstrates one key element of photography, that original lighting is still key to getting great photos. Yes there are a lot of slider bars and all that in a good imaging software package, and you can with enough work make things look a lot better, but even the fully processed top left corners of the coins in the graphic show a yellow coin, a blue coin, and a correct coin. For now I do not see an LED option that, even when processed, looks quite good enough.
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 Posted 10/26/2018  1:40 pm  Show Profile   Bookmark this reply Add atrox001 to your friends list Get a Link to this Reply
I hope this may help someone who uses halogen lighting. I use a halogen desk lamp with a white cloth filter (my wife sewed the cover from an old pillow case) for my Kennedy half dollar Variety photos. Attached are photos before the filter and after the filter.

Larry Nienaber









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 Posted 10/26/2018  2:28 pm  Show Profile   Bookmark this reply Add coop to your friends list Get a Link to this Reply
I adjust each image as I see needed. On atrox001's images I would adjust them differently:


I usually adjust the saturation first on the image, then the contrast. Sometimes repeating if I'm not happy with the unwanted color.
Richard S. Cooper
Some have asked about my images I use and I'm glad to say, you can now you can see the DVD in sections on youtube:
1. Intro, older coins, toned coins 2. Doubled dies 3. Die events, One of a kind errors 4. So called errors, Coin information 5. Coin information Types and Varieties, Overlays
Jefferson nickel doubled dies Wexler/Rebar complete listings

trail dies:http://www.traildies.com/
Valued Member
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132 Posts
 Posted 10/26/2018  3:48 pm  Show Profile   Bookmark this reply Add atrox001 to your friends list Get a Link to this Reply
Thanks Coop...I like the saturation and contrast adjustment! I usually do adjust my photos, but in this case I just wanted to show how much using a filter can change a picture.
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