What is a "luxury"?

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25.11.2002 18:38:00
The question I am writing the second time, t. To. In the first case received no reply. I'm not interested
formula, I do not know how bright is the candle, which should cover a certain area. . .
Can anybody tell how many suites on a bright sunny day, a cloudless night under a full moon, or how many of them in the room of 3x4 meters with a 40vatnoy light bulb?
My examples are optional, I just want to understand the inscription on the camera "3 suites" in the everyday sense rather than on paper.
At least, at which (in lux) lighting person ceases to see the colors and the world turns gray?
 

25.11.2002 18:48:00
In fact of the matter is that it depends on the eye. And his eyes are different.

But if for example, that:
~ 1000 lux - cloudy day in the street
~ 150 lux - bright light in the room in the evening
~ 100 lux - normal lighting in the room in the evening
flame of a candle in a dark room suite on 20-30 drags


somewhere (I think in the old journal Science and Life) recently seen such a table. Found - give a link.

Knowledgeable correct me.

PS And I have written on the camera 0. 7 suites. But I know that in this light, I do not recognize his own mother. (Practice, so to speak)


25.11.2002 18:54:00

20 lux - is created by illuminance 100 W incandescent lamp at a distance of ~ 2 m, ~ 1 lux - a moonlit night.

25.11.2002 19:41:00
Approx. Levels of Illuminance -. . . . . . . . . . . . . . . . lux (lm m-2)
Sky Condition
Direct sunlight. . . . . . . . . . . . . . . . . l-l. 3 x 5 October
Full daylight (Not direct sunlight). . . . . . 1-2 x 104
Overcast day. . . . . . . . . . . . . . . . . . 10 x3
Very dark day. . . . . . . . . . . . . . . . . . 10 x2
Twilight. . . . . . . . . . . . . . . . . . . . 10
Deep twilight. . . . . . . . . . . . . . . . . 1
Fullmoon. . . . . . . . . . . . . . . . . . . 10 -1
Quartermoon. . . . . . . . . . . . . . . . . . 10-2
Moonless, clear night sky. . . . . . . . . . . 10 -3
Moonless, overcast night sky. . . . . . . . . . 10 -4
---------------------------------------------- ---------------------
Rise center
Illuminance
Sun above the
On Horizontal
Horizon
Surface E

Degrees
lux (or lm m-2)

- August 1 6 51 x 10-4 The lower limit of astronomical twilight
- February 1 31 x 10-3 8. The lower limit of nautical twilight
- 6 3 40 The lower limit of civil twilight
- 5 10 8
- 0 . 8453 sunrise / sunset
0732

5 4760 10 1 09 x 104

45 7 59 x 104

90 12 4 x 104

-------------------------------------------------------------------------------------------------------
Rise center ------ Illuminance
sun above ----- On Horizontal
Horizon ------------------- Surface
Degrees ----- ---------------- lux (or lm m-2)

- 1 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6. 51 x 10-4 The lower limit of astronomical twilight
- 1 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8. 31 x 10-3 The lower limit of nautical twilight
- 6.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3. 40 lower limit of civil twilight
- 5.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10. 8
- 0. 8.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 453 Sunrise
0.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 732
5.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4760
10.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1. 09 x 10

45.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7. 59 x 104

90.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12. 4 x 104


26.11.2002 12:22:00
Any digital camera within range of its expo can serve as a measure of light (light meter). Knowing
Exposure value and sensitivity can be selected with precision metering errors (about 10%) to determine the illumination in lux. It's enough to be divided into a square aperture shutter speed in seconds.
However, this is true for ISO = 250, so you must be multiplied by a factor of 250 / ISO.
It turns out that if the camcorder claimed sensitivity 0, 7 suites, it is possible with equivalent sensitivity about 10,000 ISO, t. To. The signal is amplified hundreds of times (really hard to find someone)

13.12.2006 3:28:00
there was a need to measure the illumination in lux using Expometr and digital cameras

how to translate? ? ? ? what have you? ? ?

13.12.2006 3:44:00

------- -------
there was a need to measure the illumination in lux using Expometr and digital cameras

how to translate? ? ? ? what have eprst right? ? ?
-------
-------
From "Table 1. Definition of light by means of photographic exposure meters." - & Gt;
http: // aquascope. ru / modules / wfsection / article. php? articleid = 10
seen that exposure directly propor- tional suite. Therefore, an experimental
can check everything what was expressed for raschtёta.
Take the camera down, machine priaritet aperture diaphragm 4. look set shutter speed. Check the formula
reading. Then do
diaphragm 8, and watch an excerpt. Check the table, saying "directly propor- tional to the suites." And also compare with the formula. If everything is correct. . . . . . . .
There is a way.
Here narrow-eyed guys used ND filter to regulate suites.
see. "Picture comparison classified by subject"

http: // babelfish. altavista. com / babelfish / trurl_pagec ... html & amp; lp = ja_en

filter reduces ND2x suites matrix 100 times.
Sincerely, Sava3234
PS
see. Well. . .
http: // www. texinvest. ru / cctv / cctv2006. 08. 07. htm - (CEA-639) - & gt;
http: // www. ce. org / Standards / browseByCommittee_2781. asp
More little information. . . .
the camcorder has a function "night mode", with the instructions say that this mode allows you to shoot everything in color.
Usually markentingovyh needs instructions written suites for this mode. For example
take minidv camera Panasonic GS300, in her Instr. written (1lux), that "night mode" slows down the shutter speed the camera 25x times (for PAL-a) is 1.2 seconds. . In this case, the gain in db koefitsient is always 0db. Because night mode should provide apprehension by color. And there in the chamber machine worth it. Excerpt begins to increase soybean reading machine itself to the limit (1/50 - 1/2) at which the camera begins to "see" everything in color. If increasing the ISO (db), it will be a thermal (hot) pixels that will confuse the card machine exposure. Therefore, the camcorder is not in use increasing the ISO (db), a "night mode" shooting.

13.12.2006 7:04:00
quote:
:
there was a need to measure the illumination in lux using Expometr and digital cameras
Maybe better to use the light meter?

13.12.2006 7:38:00

Maybe better to use the light meter
maybe better
podgonish couple of extra


look look right now, try to digest

21.05.2007 15:56:00
Sold supposedly universal light bulb HAMA 6343 (for shtatava or shoe, I realized) at its box says 12 LUX. The pictures on the box - night party.

anyone could explain in a simple enough for what the 12 LUX? At HAM-s explanation is not found.
figures given do not understand
 

21.05.2007 23:05:00


To do this, divide the square aperture on the shutter speed in seconds.

vividly imagined myself who build 5, 6 in the square, and then dividing the "it" 1 \\ 125 seconds. . .

21.05.2007 23:15:00


Twilight. . . . . . . . . . . . . . . . . . . . 10
ie as at dusk

22.05.2007 7:40:00
As a light meter light meter will come Sverdlovsk-4 or its instructions.
It is written for ISO100 F8
60 3. 3. lux

8 26 4 lux.

1 sec. 211 lux.

1/8 1690

1/60 13500

all in proportion to 2 times by 1 step.

23.08.2012 21:46:00
Here comparative table: link
Especially useful value in the sunrise-sunset suites on Venus. A thought to shoot at sunset. . .

24.08.2012 17:19:00
I have a lamp that says "lamp power 1000000 candles" . The lamp itself is marked, that her power is 35W. I wonder what kind of "spark"?

25.08.2012 6:13:00


I wonder what kind of "spark"? - when interestno, you can look at Google, where everything is, yeah - http: // ru. wikipedia. org / wiki /% D0% 9A% D0% B0% D0% BD% D0% B ... D0% B5% D0% BB% D0% B0

Watts and Candela direct formula are not related - depend on the efficiency of the source, length wave reflector device and PDP.

25.08.2012 13:39:00

Something I did not get a million, looking at the table from Wikipedia

27.08.2012 10:43:00
The most interesting thing is that the illumination luminous flux per unit area. And the geometric component of all these signs are not taken into account.
In fact, in the same lighting conditions the surface perpendicular to the flow of light, and located at an angle will be different.
 

30.08.2012 14:09:00

most interesting is that this illumination luminous flux per unit area.

Not exactly. In photometry 1 lux is the illumination of the surface area of ​​one square meter in normal fall at her luminous flux of one lumen.
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What is a "luxury"?

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