BUSCA: Flat Fields

Flats around ~30000 counts are shown on the View Control of the GUI with a yellow color (when using the default image cuts).
To take Dome Flat Fields (screen): "Flatf. Pos." from the Telescope's GUI + "ffl" script:
CCD frame definition: full_frame_slow_bin2
Saturation begins at ~65000 counts, which is shown on the View Control of the GUI with a red color (when using the default image cuts).
FLUSH THE CCDs with the large button labeled "Flush CCD" EVERY TIME AFTER REACHING SATURATION LEVEL.
"-" in the 2019 table means "not known or low counts".

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