BUSCA: Flat Fields


January 2019

ffl lamp exp time (sec) ch 1 (ADU) ch 2 (ADU) ch 3 (ADU) ch 4 (ADU)

50 W
300 W
1000 W (2)
1000 W (2)
1000 W (2)
1000 W (2)
1000 W (2)
1000 W (2)

3.0
2.0
4.0
20.0
2.0
3.0
10.0
40.0
sdss_u
-
4400
6000
28000
-
-
-
-
v
-
-
-
-
5000
7000
24000
-
u
470
-
-
-
1700
2300
6700
26000
Hb-W
-
21000
52000
satur
-
-
-
-
b
1200
-
-
-
19000
28000
satur
-
y
2200
-
-
-
38000
satur
satur
-
I
24000
-
-
-
satur
satur
satur
-

50 W
50 W
300 W

1.0
4.0
1.0
UV_B
1000
3000
20000
B_B
7600
27000
satur
R_B
28000
satur
satur
NIR_B
13000
60000
satur

Example for taking ~26-30K ADUs flats with only blanks filters

Channel (filter) Lamp exposure time (seconds)
1 (UV_B)
2 (B_B)
3 (R_B)
4 (NIR_B)
300 W
50 W
50 W
50 W
1.5
4.0
1.0
2.0

May 2010

ffl lamp exposure time (seconds) channel 1 (counts) channel 2 (counts) channel 3 (counts) channel 4 (counts)

50 W
50 W
50 W
300 W

0.4
0.8
1.6
0.6
UV_B
1200
1900
3000
26500
B_B
7000
14000
27000
-
R_B
25000
51000
-
-
NIR_B
12000
24000
48000
-

50 W
300 W
300 W
300 W
300 W

1.5
1.0
1.5
5.0
5.5
v
900
6100
9000
28000
31500
b
1500
19000
27500
-
-
y
2300
30000
45000
-
-
I
31000
-
-
-
-

300 W
300 W
3000 W

1.0
14
1.3
u
2600
30000
3300
Hbeta(wide)
23000
-
30000



300 W

5.5

Hbeta(narrow)
25000


January 2009

ffl lamp exposure time (seconds) channel 1 (counts) channel 2 (counts) channel 3 (counts) channel 4 (counts)

150 W
1000 W
1000 W
2000 W

3.0
1.5
3.0 / 12
30
u
-
-
-
30000
b
-
-
28000 / 30000
-
y
-
30000
-
-
I
30000
-
-
-

1000 W

15

-
Hbeta(narrow)
35000

-

-

1000 W

3.0

-
Hbeta(wide)
35000

-

-

March 2004

ffl lamp exposure time (seconds) channel 1 (counts) channel 2 (counts) channel 3 (counts) channel 4 (counts)

150 W
150 W
150 W
150 W
150 W
300 W

1.5
2
2.5
3.5
30
5
UV_B
2200
2800
3400
4500
34000
38000
B_B
13000
18000
22000
31000
saturated
saturated
R_B
25000
34000
42000
saturated
saturated
saturated
NIR_B
34000
45000
56000
saturated
saturated
saturated

150 W
150 W
1000 W
1000 W
1000 W

2
2.5
0.3
11
12
v
-
-
-
23000
25000
b
-
-
-
33000
35000
y
-
-
-
36000
39000
I
29000
37000
36000
saturated
saturated

3450 W

10
u
27000
Hbeta(narrow)
33000



1000 W

7

Hbeta(wide)
34000