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Old Mar 20, 2004, 6:36 AM   #1
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Default Speedlights - SB-800 vs. SB-600 for D70

What's the difference between the SB-800 abd SB-600? Would one have any advantage over the other on the D70?
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Old Mar 20, 2004, 9:18 AM   #2
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http://nikonusa.com/template.php?cat...productNr=4801
http://nikonusa.com/template.php?cat...roductNr=SB600

Most notable is the difference in power output (guide number at 100 ISO is 30m vs 56m), then the zoom (auto/manual 24-85mm vs 24-105mm).
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Old Mar 20, 2004, 9:26 AM   #3
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Can someone tell me what a guide number is?

Thanks

Michael
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Old Mar 20, 2004, 9:42 AM   #4
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A guide number is a number value of how far the flash can illuminate at given a ISO and focal length. Usually manufacturers give guide numbers at ISO 100 at whatever max focal length the flash can zoom to. For example, the SB-800 has a 56 meter guide number at ISO 100 and 105mm. Doesn't mean the subject at that distance will be as well lit as a subject closer to you, but it's to give you an idea of the power output using a somewhat standard method of measurement.
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Old Mar 20, 2004, 10:37 AM   #5
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Thanks for the information. So are you saying, that if I had an sb-800 and if my camera could do iso 100 and 105mm, then I could expect the flash to work up to 56 meters .... or am I totally way off base.

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Old Mar 21, 2004, 10:37 PM   #6
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You are right, but as I said, it's only a measure for comparison. If you take a picture of a person 56 meters away at night in total darkness, you will not see much of that person.
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Old Mar 24, 2004, 4:46 PM   #7
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um not quiet right!! thereis one missing part of your equation!!!

the F/stop!!

Guide number = f/stop x distance to subject

therefore the greater the guide number the greater the distance you can achieve at a particular f/stop. Or a smaller apeture at the same distance.

the iso 100 is related to the film not the flash. ie at 200 iso you can use one apeture stop smaller ie f 8 instead of f 5.6
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Old Mar 24, 2004, 6:02 PM   #8
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That too, it must've slipped my mind :P
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