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  Flashbulb Guide Number Information
Clear Flashbulbs are used for black and white film.
Blue Flashbulbs are used for color film daylight
balanced and also for Black and White film.

All values are approximations, reflector size and finish, shape, room size, ceiling heights,wall and ceiling color, average subject, natural and ambient light, etc. all have an affect on your final exposure.

You should perform a variety of test exposures under
different conditions to familiarize yourself with the use of guidenumbers and exposure values using flashbulbs.

Blue Bulbs


Order Here  
 
 
Number in parenthesis under lamp type refers to reflector size and type.
(1) = 4-5 inch polished reflector
(2) = 6-7 1/2 inch polished reflector
(3) = large studio reflector
(4) = 3 inch polished reflector
(5) = 2 inch polished reflector

Guide Number = f: stop
Distance To Subject

To determine your lens opening choose a guide number based on your ASA film speed, and your chosen
shutter speed. Divide that guide number by the distance to your subject. The result is the f: stop to set on
your lens.


  
 
Blue Flashbulbs
Color Daylight Film
 
Lamp Type
           Shutter Speed                    ASA Film Speeds
10
to
12		 16
to
20 		25
to
32		 40
to
64		 100 to 125 160 to 200 320 to 500
    Flashcube "X" Sync.                Up to
 1/30 32 42 55 75 100 130 200
                              Up to


"M" Sync. Only                                             		1/60 22 28 36 50 70 90 130
1/125 18 24 30 42 60 75 110
1/250 15 19 24 34 48 60 90
1/500  12 16 19 28 38 48 70
     AG-1B
(Class MF)
         (5)		 "X" Sync.                Up to
 1/30 46 60 75 100 150 190 280
                                Up to

"M" Sync. Only

 1/60 30 38 48 65 95 120 170
1/125 26 32 42 60 80 100 150
1/250 22 28 34 48 70 85 130
1/500 18 22 28 40 55 70 110
    M-2B
(Class MF)
      (4)
 "X" Sync.               Up to
1/30 42 55 70 95 140 170 250
     M-3B
   (Class M)

        (4)
     Focal
     Plane

 "X" or "M"                Up to 1/30 65 80 100 140 200 260 400
"M" Sync. Only 1/60 55 70 85 120 170 220 320
1/125 46 60 75 100 140 180 280
1/250 36 46 60 80 120 150 220
1/500 30 38 48 65 95 120 180
"X" Sync.                Up to


"FP" Sync. Only
 1/30 65 85 110 150 220 280 400
1/125 42 50 65 95 130 170 240
1/250 30 38 48 65 95 120 170
1/500 20 26 34 46 65 85 120
1/1000 15 19 24 34 46 60 90
    Press 25B
   (Class M)

        (1)

 "X" or "M"              Up to
 1/30 65 80 100 150 200 260 380
"M" Sync. Only 1/60 60 75 95 130 190 240 360
1/125 50 65 85 120 160 200 300
1/250 40 50 65 90 130 160 240
1/500 30 40 50 70 100 120 180
      FP-26B
   (Class FP)

        (1)

                              Up to

"FP" Sync. Only

 1/30 65 85 110 150 220 260 400
1/125 32 40 50 75 100 130 190
1/250 22 28 36 50 70 90 140
1/500 16 20 26 36 50 65 100
1/1000 11 14 18 26 36 46 70
    Type 2B
   (Class M)

        (2)

                               Up to
 1/30 100 130 160 220 320 400 600
1/60 85 110 140 200 280 360 520
1/125 75 95 120 170 240 300 440
1/250 60 75 95 130 190 240 340
1/500 44 55 75 100 140 180 260
   Type 3B
   (Class S)
       (3)		                               Up to
 1/30 130 170 220 300 420 550 800
 

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No. 5B with 4-6 inch Polished Reflector
With "M" synchronization . . . use any shutter speed.
"X" or "F" synchronization . . . use 1/30th or slower.

 
     ASA
     Film
    Speed		      25      32
     40
     50		      64
     80
     100		      125
     160
     200		      250
     320
     400		      500
     640
     800		     1000
    1250
    1600
1/30 or slower      105      135      190      270      370      530      750
1/50 & 1/60      95      120      170      240      340      480      670
1/100 & 1/125      80      100      140      200      280      400      600
1/200 & 1/250      60      75      105      150      210      300      420
1/400 & 1/500      40      50      70      100      140      200      280
 

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No. 11B-with 6-7 inch Polished Reflector
With "M" synchronization . . . use any shutter speed.
"X" or "F" synchronization . . . use 1/30 second or slower.
 
Daylight Film
    Exposure
      Index		      10      12      25      32      64      100      200
Shutter Open
   & 1/25		      65      70      100      120      160      200      300
     1/50      55      60      90      100      140      180      240
     1/100      50      55      80      90      130      160      220
     1/200      40      44      65      70      100      130      180
     1/400      30      32      48      55      75       95      130
 



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No. 22B with 6-7 inch Polished Reflector
With "M" synchronization . . . use any shutter speed.
"X" or "F" synchronization . . . use 1/30th or slower.
 
     ASA
     Film
    Speed		      25      32
     40
     50		      64
     80
     100		      125
     160
     200		      250
     320
     400		      500
     640
     800		     1000
    1250
    1600
1/30 or slower       135      170      240      340      480      670      950
1/50 & 1/60      120      150      210      300      420      600      850
1/100 & 1/125      100      125      180      250      350      500      700
1/200 & 1/250      75      95      135      190      270      370      530
1/400 & 1/500      53      67      95      135      190      270      370
 

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No. 50B with Medium Size Studio Reflector
With "M" synchronization.
 
     ASA
     Film
    Speed		      25      32
     40
     50		      64
     80
     100		      125
     160
     200		      250
     320
     400		      500
     640
     800		     1000
    1250
    1600
1/30 or slower      190      240      340      480      670      950      1250
 


Note: Guide Number information obtained from Sylvania and General Electric
Lighting Data Guides.

Click Here for Blue Bulbs.

Click Here for Clear Bulbs.

Click Here for Film Rating Conversion Table.


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Bill Cress
PO Box 4262 Wayne, NJ 07474-4262
tel. (973) 694-1280 | fax. (973) 694-6965
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