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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.

Clear 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.


  
 
Clear Flashbulbs
Black and White Film
 
Lamp Type
           Shutter Speed ASA Film Speeds (Tungsten)
10
to
16		 20
to
32 		40
to
64		 80
to
125		 160
to
250 		320
to
500
    AG-1
(Class MF)
     (5)		 "X" Sync.                Up to
 1/30 65 90 130 180 260 360
                              Up to


"M" Sync. Only                                             		1/60 40 60 85 120 170 240
1/125 34 50 70 100 140 200
1/250 28 42 60 85 120 170
1/500  24 34 48 70 95 140
     M-2
(Class MF)
      (4)		 "X" Sync.                Up to
 1/30 60 90 120 180 240 360
    M-3
(Class M)

      (4)
Focal Plane

 "X" or "M"             Up to
1/30 90 130 180 260 360 500
"M" Sync. Only 1/60 75 110 150 220 300 440
1/125 65 90 130 180 260 360
1/250 50 75 100 150 200 300
1/500 40 60 85 120 170 240
"X" Sync.                Up to


"FP" Sync.only
 1/30 95 130 190 260 380 550
1/125 55 80 120 170 240 340
1/250 40 60 85 120 170 240
1/500 28 42 60 85 120 170
1/1000 20 30 42 60 85 120
  Press 25
(Class M)

     (1)

 "X" or "M"              Up to
 1/30 95 140 200 280 400 550
"M" Sync. Only 1/60 90 130 180 260 360 500
1/125 75 110 160 220 320 440
1/250 60 85 120 180 240 360
1/500 46 65 95 130 190 260
1/750 34 50 70 100 140 200
Press 40
(Class M)
      (2)		                              Up to
 1/30 100 150 200 300 420 600
1/60 90 130 180 260 360 500
1/125 75 110 160 220 320 440
1/250 60 85 120 170 240 340
1/500 46 65 95 130 190 260
   FP-26
(Class FP)

     (1)

                              Up to


"FP" Sync. Only

 1/30 100 140 200 280 400 550
1/125 48 70 95 140 190 280
1/250 34 48 70 95 140 190
1/500 24 34 48 70 95 140
1/1000 17 24 34 48 70 95
  Type 2
(Class M)

    (2)

                               Up to
 1/30 150 220 300 420 600 850
1/60 130 190 260 380 550 750
1/125 110 160 220 320 460 650
1/250 85 130 180 260 360 500
1/500 70 100 140 200 280 400
   Type 3
(Class S)
      (3)		                               Up to
 1/30 200 280 400 550 800 1150
 

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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      135      170      240      340      480      670      950
1/50 & 1/60      125      160      220      320      450      650      900
1/100 & 1/125      100      125      180      250      350      500      700
1/200 & 1/250      80      100       140      200      280      400      550
1/400 & 1/500      50      65       90      125      180      250      350
 

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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.
 
     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      100      125      180      250      350      500      700
1/100 & 1/125      95      120      170      240      340      480      670
1/200 & 1/250      75      95      135      190      270      370      530
1/400 & 1/500      55      70      100      140      200      280      400
 



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No. 22 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      180      220      320      450       650      900      1250
1/50 & 1/60      150      190      270      370      530      750      1050
1/100 & 1/125      125      160       220      320      450      650      900
1/200 & 1/250       90      110      160      220      320      450      650
1/400 & 1/500      65      80      110      160      220      320      450
 

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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      240      300      420      600      850      1200      1700
 



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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