Easy Coin Photography - 2011 - Part Four

If you missed them, part one of this discussion is here., part two is here. and part three is here.

Part four of our discussion will address my preferences for light bulbs.

Part two of the discussion introduced the question of light color balance and suggested that daylight supplied from the sun was an acceptable light source. This page will take further the question of artificial light. Standard incandescent and small high intensity lamps can be used for photography but both provide a warm color balance that many digital cameras have trouble balancing correctly. They also produce a lot of heat making working in close quarters somewhere between uncomfortable and dangerous. Daylight versions of the new twist type compact fluorescent bulbs vary greatly in terms of how well they replicate the full color spectrum. The best are rather good but my experience is that they do not last as long as advertised with frequent handling. I also suspect that they will be removed from the market eventually due to their mercury content. The new technology that looks promising is LED bulbs. These also come in several color balances. I have used and been satisfied with daylight balance LEDs advertised as 5500 and 6000 degrees Kelvin. Standard screw base (E27) LED bulbs are available in many configurations with varying numbers of LEDs wired together. Each has advantages and disadvantages. The larger (108 LED) 'corn cob' design is brighter and provides rather non directional light that looks good when used on high relief coins while the smaller (24 LED) unit is easier to position next to the camera for controlled results on lower relief coins. While both were rated as daylight balance, one defined that as 5500 and the other as 6000 so their colors do not match each other. With my camera, it is a simple matter to set a manual white balance and either bulb can be balanced easily to give proper color results.

Below, the white balance was set for the corn cob unit and the top row shows the uncorrected results 'out of camera'. The left coin in each pair was taken with the corncob but the right coins, taken with the smaller unit, are considerably too magenta. This, however is easily corrected with postprocessing color balance adjustments which produced the second row making the right coin in each pair acceptable and the left coins too green. This is no problem if you buy all your bulbs to match or don't mind making little color edjustments (which is usually necessary for best results anyway). Note that the portrait on the half groat of Henry VIII with its low relief looks better using the more directional bulb while the letters on that coin and the whole of the high relief Larissa drachm strike me as more pleasing using the larger bulbs (I have a bank of two providing an even softer, larger light source). I have long said that there is no single answer to best lighting for every coin so, again, all this has shown is that the individual photographer needs to fit the equipment to individual preferences and the coins being photographed. Both types bulbs shown here were purchased from Hong Kong via eBay sellers at $5 to $7 postpaid per bulb. My local sources are considerably higher in price. I have no idea how long they will last. Wherever you buy, be careful to check bulb color, voltage and base size specifications to match your local electrical situation. LED bulbs are made in a hundred configurations including one that will be right for you.

Those not ready to try LED bulbs can see many other options presented on my older photo pages linked below.

Please visit my pBase Gallery:

My pBase Coin Gallery with many new photos and some discussion

Other photo postings:

The following pages were posted to my coin site in years past. Some of them have become a bit dated but there is some value left here and there. All are invited to visit them and any other pages on my coin site.

Coin Photography 2008 update
Coin Photography with a Microscope
Photographing a Nero Dupondius
Coin Photography with the Canon 300D
Coin Photography with the Minolta D7i
Coin Photography with the Minolta D7i (earlier page)
Coin Photography with the Nikon 990
Coin Photography (pre-digital page)

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(c) 2011 Doug Smith