Film SLR seagull DF- 1

I sorted out the notes I made in the library at college. There are many references in it, so I won't list them one by one. I hope it will be beneficial to those beginners!

First, the basic concept of electric vehicles

EV value is an indication of exposure. It represents the corresponding relationship between the first aperture or the first shutter speed and 1EV. For every step of 1EV value, the aperture or shutter speed is one step, and the light received per unit area on the photosensitive material is twice as bad.

Correspondence between common EV values and shutter and aperture under ISO 100.

Two. Measurement of EV

1. Exposure meter (built-in independently)

2. Experience (based on the Sixteen Methods of Sunshine)

3. Estimation of EV value under ordinary lighting conditions

1. EV=4 under candlelight or bright moon

2. Direct sunlight object EV= 15 (the basis of the Sixteen Methods of Sunshine)

3. In the daytime with strong sunshine (10 ~ 15), EV = 16, earlier than 10 or later than 15, EV= 14.

4. Estimation of EV value under indoor natural light (the distance between the object and the window is 1.5m).

Indoor conditions bright wall and white wall

Multi-window single window multi-window single window

Very bright sunshine on sunny days 8 7 10 9

Sunny sunshine 7 6 9 8

Thin cloud weather 6 5 8 7

Thick cloud weather 4 3.5 6 5

Dark clouds weather 3 2 5 4

5. Estimation of EV value under indoor lighting conditions (ISO 100)

Lighting conditions of shooting content EV aperture shutter

At night, the indoor lighting fluorescent lamp is 48W, and the distance is1m62115.

At night, the indoor lighting incandescent lamp is 25W, and the distance is 1m 5.6 1.

There is no other light in the indoor candlelight, and the distance is 0.5m 4 2 1/4.

Brighter stage lights for stage performances 9 4 1/30

Interior lighting of karaoke hall, dome light 5 5.6 1.

6. Estimation of EV value under outdoor night scene conditions (ISO 100)

Shooting content shooting conditions EV aperture shutter

The lighting distance of the construction site is 20 ~ 30m2 ~ 5.6 ~ 8 2 ~ 8.

Holiday lanterns and neon lights are15 ~ 30m3 ~ 55.6 ~ 81~ 6.

Clear and cloudless moon sky, bright 45.6 ~ 8 1 ~ 4.

Street lamps lit up the building. The distance between the lamp and the building is10m, and the relative density N/A is 5.6 ~ 8 120 ~ 240, b.

Fireworks in the night sky 9 5.6 ~ 81/5 ~115 when the fireworks bloom.

The night scene of the Bund building is 45.6 ~ 8 1 ~ 2, and there are dozens of meters of colored lights.

The night view of the Lantern Festival is about10m, 55.6 ~ 8 1/4 ~ 1.

Soft lighting details Figure 4 2 1/4

Bright street view at night 8 2.8 ~ 4 1/30

Market 4 2 1/30

Fireworks and lightning are not applicable to 8 ~11b.

Bright stage104160

Meteor n/a 2 ~ 2.8 b

Four. Influence of various conditions on EV value

1. diurnal variation

Basic exposure value: B is the basic exposure value after sunrise and 2.5 hours before sunset on sunny days.

Sunrise and sunset:110b

After sunrise 1 hour, before sunset: 1/4B

2 hours after sunrise and before sunset: 1/2B

2. Weather changes

Sunny days, thin clouds, thick clouds and dark clouds decrease in turn 1EV.

3. Seasonal changes

Summer → spring and autumn → winter decreases in turn 1EV.

4. Latitude change

The latitude difference between north and south of the Tropic of Cancer is 15 degrees /EV.

5. Height change

Add 1/3EV at an altitude of about 2000m.

Add 1/2EV at an altitude of about 3000m.

About 4000 meters above sea level plus 2/3EV.

6. Changes in exposure of subjects

Light reception: positive light side light side backlight side backlight backlight.

The reduction amount is 00.5 12 ~ 303 ~ 40.

Remarks Deep background bright background deep background bright background

7. Changes of reflected light from the main body

Subject: people or things in the shadow of the beach, white clouds in the air; Bark brick structure object; White gypsum body; People or scenic squares in the snow scene.

EV changes+1~ 2-2-1/2+1~ 2+1~ 2+/.

Attachment: dynamic photographic exposure

1. Influence of moving body speed (moving body distance is about 15m)

Moving object speed (m/s) shutter speed

Run 2.5 1/60

Bicycle 7.51125

Horse racing 16 1/250

Cars and trains 30 1/500

Aircraft 4011000

2. The influence of moving body distance

The distance between moving objects is reduced by half and the shutter speed is increased by one step.

3. The influence of the angle between the moving object and the camera

Moving body facing the camera -0 degrees

Tilting motion of a moving object -45 degrees

The moving object passes through the lens -90 degrees.

Moving object 0 degree shutter 45 degree shutter 90 degree shutter

Run1151/301/60.

Bike1/301/601125

Horse racing1/6011251/250

Cars and trains11251/2501/500