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Old Sep 13, 2004, 8:31 AM   #1
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Having read all the threads on these two flashes, I still have a question to those that compared the two. Vivitar has giude number 40, while Sony has 14. Does it mean that Vivitar has greater range?

Also, the pictures of the Vivitar,s horizontal bracket do not show a tripod socket to use the flash with a camera and tripod. I did not see a close up shot of the Sony bracket.

Thanks
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Old Sep 13, 2004, 9:55 AM   #2
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dmitri2 wrote:
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Having read all the threads on these two flashes, I still have a question to those that compared the two. Vivitar has giude number 40, while Sony has 14. Does it mean that Vivitar has greater range?
Guide Number is the f-stop x distance = GN (for the same ISO)
However one is in meter while the other is in feet... (@ a much lower cost)


FYI
http://www.stevesforums.com/forums/v...23&forum_id=28
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Old Sep 13, 2004, 10:04 AM   #3
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dmitri2 wrote:
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Vivitar has giude number 40, while Sony has 14. Does it mean that Vivitar has greater range?

dmitri2,
The guide number is given by a distance in feet or meter , corresponding to ISO100.
What manufacturer tend not to say clearly is the coverage angle corresponding to that Guide number.
In the case the flash has a zoom head, the guide number could be mentioned at the full zoom (tele) which gives the highest GN.

Sony HVL-FSL1B

http://www.sonystyle.com/is-bin/INTE...ctSKU=HVLFSL1B
http://www.adorama.com/ISOHVLFSL1B.h...&item_no=1
Specifications • Shooting Distance: (3.5m - 6.1m)
• Guide Number: 14
• Lighting Angle (Vertical): 45 Degrees
• Lighting Angle (Horizontal): 60 Degrees


Vivitar DF120 Digital Slave Flash
http://www.adorama.com/VVDF120.html

Specifications
Guide Number 40 (ISO 100/ft)
Auto Settings Auto
Angle of Coverage Covers 35mm lens (equivalent on 35mm Cameras)
============================

1) GN: the Sony GN is given in meter , corresponding roughly to 45 feet.
2) the coverage angle are more or less comparable in both flashes
(can't find a web page with a chart showing this)


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