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Flash Photography

d5000 low turn on canon pentax flash sb-600 outside pop-up ithree6mafia sigma tamron 35mm jaredpolin digitalrev 7d1.8 gap DigitalRevCom ...

SB 600 Flash Unit Help?

Regular Guide Number (GN) in feet, ISO 100:

Zoom Mounting GN
14 mm 36 (40 - 1/3)
24mm 64 (56 + 1/3)
35mm 71 (80 - 1/3)
85mm 100 (110 - 1/3)

What's a guide number?
Where does zoom settings


Director numbers are just a measurement of sign light output, usually always reasoned at 100 ISO. It is a way to compare flash power amoung heterogeneous flash units.

You can use the guide mass to calculate f stop, but you must know the


GN is the crop of the flash. (power - max)

SB600 GN100(32 in meters - 3 feet to a meter rudely) - this is at 100iso - fotogs talk 100iso or establish different

So example: subject is 4m (12ft) from the before you can say 'Jack Robinson', what fstop

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Tamron 35mm 14 - News


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