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light meters
Oct 6, 2016 09:13:04 #
If you are not going to use the meter on a regular basis try the least investment that will help you get accurate exposure and consider the "Sunny 16 rule" that works pretty good in sunlight.
I am not familiar with meters in iphones. An exposure meter for incident and reflected light could be a good investment depending on the use you will have for it.
Sekonic makes excellent light meters.
I am not familiar with meters in iphones. An exposure meter for incident and reflected light could be a good investment depending on the use you will have for it.
Sekonic makes excellent light meters.
Oct 6, 2016 09:32:51 #
Teddys1 wrote:
I am thinking about breaking out my (1960) Voightlander shoot some film.
Any suggestions for light meters?
I am hearing some good things about Luxo and Iphone meters...any suggestions.
TIA
Alan
Any suggestions for light meters?
I am hearing some good things about Luxo and Iphone meters...any suggestions.
TIA
Alan
You might start with a free or inexpensive smartphone app which should be a little better than Sunny 16 since some lighting situations are not easy to judge.
Hard to beat the Gossen Digisix 2. At $173 (new) it might seem pricey but it's tiny and precise enough for incident readings with film or digital. The Sekonic L-308S is a little larger and about 1/2 the price (used).
Oct 6, 2016 11:35:15 #
EdJ0307 wrote:
I would hope technology has advanced from the 1960s, even in light meters.
The 1960s light meter technology was based on the optical properties of selenium: light ibcident on selenium would induce a voltage proportional to the light intensity. No external electric power was needed. Are current light meters independent of selenium, say by transistors? The only way to alter selenium's electrical properties are by making it of greater purity or by adding carefully selected 'doping' elements (as in periodic table of).
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Oct 6, 2016 12:17:34 #
wj cody
Loc: springfield illinois
gossen, minolta, pentax spotmeter, sekonic; in alphabetical order.
Oct 6, 2016 14:25:37 #
RWR
Loc: La Mesa, CA
John_F wrote:
The 1960s light meter technology was based on the optical properties of selenium:
In fact, 1960s light meter technology was based on the CdS cell, which Gossen introduced in 1961 with the Lunasix (Luna Pro in the US). I still use my Luna Pro (bought in 1967) almost daily, since none of my medium format cameras have a built-in meter.
Oct 6, 2016 18:53:25 #
Oct 6, 2016 21:23:00 #
RWR wrote:
In fact, 1960s light meter technology was based on the CdS cell, which Gossen introduced in 1961 with the Lunasix (Luna Pro in the US). I still use my Luna Pro (bought in 1967) almost daily, since none of my medium format cameras have a built-in meter.
Both selenium and CdS are photovoltaic, but CdS meters require a battery while the Se meters did not. CdS is a direct band gap semiconductor (it's band gap accounts for its yellow color) and lost transister usefulness when Germanium and Silicon semiconductor properties became known. Silcon won out as its band gap exceeded Ge's, so thermal effects became lesser.
I checked Wikipedia for CdS and Selenium and Light Meters.
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Oct 6, 2016 21:30:18 #
John. I don't think you can call CdS photovoltaic but rather photo resistor. It doesn't generate a voltage like the Selenium cell.
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