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agiaccio Dec 21, 2004 6:49 AM

I am looking at getting the Nikon CP8400 with the Nikon SB-50DX speedlight (due to smaller size and price difference). In Steve's review he mentions the following "Using the hot shoe, the Coolpix 8400 can be fitted with an external i-TTL speedlight such as the Nikon SB-600 or the SB-800 (SB-50DX shown but usable only in Auto)."

For a newbie to photography in general (especially flash photography) what does using a flash in AUTO mean? I want to use the external flash for indoor people pics to remove red-eye especially for my youngest daughter who has green eyes and always gets "devil-looking red-eyes" with most point-n-shoot cameras which have a built-in flash (e.g. Canon S400).

My wife an I are not interested in post-processing and what to print up to 8x10" pics on our Canon i950.


KCan Dec 21, 2004 8:24 AM

agiaccio wrote:

what does using a flash in AUTO mean?
Auto mode means set both the flash and the cameraat a sameaperture value , then the FLASH use an on board sensor to cut itself off when there is enough light for that aperture.

This means the camera must be on manual exposure (or aperture priority) mode. There is no feedback from the flash to the camera, the camera trigger the flash , that's it.


edit: sorry, I just realize my error in the post >> the flash use an onboard sensor, not the camera.

Carlitin Jan 7, 2005 6:07 AM

KCan : I need your guide, I have the nikon speedlight SB-22, and has A- M- and TTL , so, can I used in the Nikon D70 ?? and how . wath is the best setting for this ? Carlos

KCan Jan 7, 2005 8:03 AM

Hi Carlos,


Flash Control
3) Non-TTL Auto: Available with Speedlights such as SB-800, 80DX, 28DX, 28, 27, and 22s
TTL: no , not even with the 22s
Auto: Steve mentioned the 22s, but I believe it's applicable to the 22 as well.

Settings: as I mentioned above, you have several choices :

- You use the camera in manual exposure mode, basically, same aperture as your F setting on the flash in auto mode. The flash then control the subject (foreground) exposition (the subject reflect the flash light to it's own sensor)
The camera speed has relatively little effect on the subject because the duration of the flash is relatively short , and is the main lighting source.(for example, just to illustrate what I mean, you can take a shot in total dakdness with a flash , one at 1/60 sec , one at 10 sec, same result)
The background exposition is determined by your speed/aperture combination (as a normal non flash case)

- You use the camera in aperture priority exposure mode. Same thing for the aperture. The speed is chosen by the camera to match the whole scene not considering the flash. You have to make sure that the speed chosen will not ruin your shot (for example , background blur if the speed is too low)

- You use the flash in manual mode, and you calculate the speed-aperture values with the GN formula ( I practically never do this, too much calculus :angry:)

Hope that it helps you some way

Carlitin Jan 7, 2005 4:28 PM

KCan : Thanks a lot, I will start to work in Manual mode with diferent settings, to see how the D70 and flash take the pics. Your coments save my old SB-22s. After few days I will tell you waht hapen.. OK :-) Carlos

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