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SB-400 Bounce Flash



 
 
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  #1  
Old February 20th 12, 07:32 PM posted to rec.photo.digital.slr-systems
David Dyer-Bennet
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Default SB-400 Bounce Flash

pago writes:

Dear All,

According to the nikon speedlight sb-400 user manual, you should use
larger aperture settings (e.g. f3.6, f4.0, f5.6) if you wish to bounce
flash. How can this be? Can anyone explain the rationale behind
this?

As for me, I would do the opposite because a bounce flash has more
distance to travel, and therefore, to compensate, i would stop down
the aperture to allow more light in.

(All things being equal, off course.)


I apologize on behalf of 100+ years of photographic history. The
terminology for lens apertures is indeed confusing; your problem is that
you have been confused by it.

Larger f-numbers (as in, 8 is larger than 5.6 is larger than 4) means
*smaller* actual apertures and less light let through.

F-numbers are the ratio of focal length to aperture size (in the same
units; they're a dimensionless number). Larger aperture means smaller
f-number, because the aperture is in the denominator.
--
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Photos: http://dd-b.net/photography/gallery/
Dragaera: http://dragaera.info
  #2  
Old February 20th 12, 08:20 PM posted to rec.photo.digital.slr-systems
Elliott Roper
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Posts: 174
Default SB-400 Bounce Flash

In article , David Dyer-Bennet
wrote:
snip

Larger f-numbers (as in, 8 is larger than 5.6 is larger than 4) means
*smaller* actual apertures and less light let through.

F-numbers are the ratio of focal length to aperture size (in the same
units; they're a dimensionless number). Larger aperture means smaller
f-number, because the aperture is in the denominator.


S'funny. I knew all the f number stuff, how it was defined and all, yet
never connected the dots when people said f/8 rather than f8. I spent
the last 50 years thinking the "/" was affectation.

Who says you can't teach an old dog new tricks?

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To de-mung my e-mail address:- fsnospam$elliott$$
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  #3  
Old February 22nd 12, 10:45 PM posted to rec.photo.digital.slr-systems
David Dyer-Bennet
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Posts: 1,814
Default SB-400 Bounce Flash

Elliott Roper writes:

In article , David Dyer-Bennet
wrote:
snip

Larger f-numbers (as in, 8 is larger than 5.6 is larger than 4) means
*smaller* actual apertures and less light let through.

F-numbers are the ratio of focal length to aperture size (in the same
units; they're a dimensionless number). Larger aperture means smaller
f-number, because the aperture is in the denominator.


S'funny. I knew all the f number stuff, how it was defined and all, yet
never connected the dots when people said f/8 rather than f8. I spent
the last 50 years thinking the "/" was affectation.


I know the feeling; I really noticed that as significant not all that
long ago myself (less than your 50 years).

Who says you can't teach an old dog new tricks?


Sometimes, sometimes.
--
David Dyer-Bennet, ; http://dd-b.net/
Snapshots: http://dd-b.net/dd-b/SnapshotAlbum/data/
Photos: http://dd-b.net/photography/gallery/
Dragaera: http://dragaera.info
 




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