Help needed on using flash
- Thread starter zhapchit
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Put the Flash into the shoe, aim the camera and press the shutter!Originally posted by zhapchit
i have a nikon sb28. and i'm using FM2.
Need advice on using the SB28
i tot u need to on the flash 1st? :dunno:Originally posted by Bluestrike
Put the Flash into the shoe, aim the camera and press the shutter!
HAHAHHAHAHAHHA
Ok lar guys... think this guy need help man!
So who can? Sorry tho but I'm a Canon guy using Sigma lens.....
Ok lar guys... think this guy need help man!
So who can? Sorry tho but I'm a Canon guy using Sigma lens.....
Hmm... FM2 is a manual camera right? Not sure whether it support TTL or not. If not, got to set the SB28 on Auto mode, or do it the good old way - use manual mode.
Right. FM2 has no TTL, so set the SB28 to Non-TTL Auto [A], set a desired aperture on the flash, set the same aperture on the camera, then shoot. Make sure the ISO on the flash and camera matches as well.
Regards
CK
Yup you can. Do it like what ckiang described. Set flash to Auto mode, set the ISO, and set the aperture. You'll also need to zoom the flash manually if you are using zoom lens.
Guys, please correct me if I am wrong. A flash's guide number is calculated as follow:
GN = subject distance * f-stop value
The max. GN of a flash unit is usually given for ISO 100 film. So in manual mode using ISO 100, assuming a flash of GN20 (m) and your subject distance is at, say, 2.5m, then
f-stop = 20 / 2.5 = 8
For film speed other then ISO 100, multiply the GN by 1.4 for each stop. So for ISO 400, a GN20 flash will become 20 * 1.4 *1.4 = 39.
You can refer to this page on photozone for more info.
In older flash there is usually a dial at the back of the flash for you to check the setting. You just dial it according to your ISO and subject distance to get the aperture value. Modern flashes with auto mode will automatically calculate the power output according to the ISO and aperture value you set, with the distance it measures from its sensor.
Simple way.
Assuming you are using ISO 100 film, and you are having ambient exposure of 1/125s at f/8.
To have a normal flash exposure, set your flash to ISO 100, f8
To have -1 fill, set flash to ISO 200, f8 or ISO 100, f5.6
Regards
CK
In this case, since its not TTL... the flash needs to know how much light to output. The flash need to know the sensitivity of the film and the amount of light that is entering the camera. Then it fires a preflash (I guess) and judge the reflection of the subject and then emitts a flash that should correctly expose the pic taking the sensitivity of the film and the aperture into consideration.
i.e If the aperture is larger, the flash out put should be lower compared to a case where the aperture is larger. And a High ISO film will require less light, so the flash has to emit a lower output.
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