guys think thats possible...?
guys think thats possible...?
Definitely possible - aperture size should have no bearing when using any flash unit.
f/1.8 for shallow DOF?
Last edited by Scaglietti; 19th February 2007 at 07:44 PM.
Most people shoot in studio because you can use small aperature size to get sharp pictures. Why shooting at f1.8 when you can shoot at a smaller aperature size (also bearing in mind that the so called best aperature size to shoot at is definitely not the widest)???
For shallow DOF? There are also other ways of achieving that FYI...
1) Larger aperature size (as discussed)
2) Longer focal length
3) Closer subject to camera distance
For portraiture shoots, I don't see there's anything to bokeh... Maybe you are thinking of still life I presume?
Apologies if my earlier post was misleading.
The aperture one selects certainly has a direct effect on exposure as every full stop represents either a halving or doubling of the amount of light passing thru the lens. Certainly the aperture one selects would be based on several considerations: DOF, maximising the optimum sharpness of the lens, flash working distance, flash power, etc.
So long as the shutter speed used is within the flash sync speed, for a given exposure value (EV), any combination of shutter speed/aperture can be used. If for example, a meter reading for a still life using a particular studio flash setup is say 1/15 sec at f5.6 (EV9). If the exposure is kept the same, one could also shoot at 1/30 at f4, 1/60 at f2.8 or 1/125 at f2. Obviously while the exposure remains the same, DOF, sharpness, etc. will differ. Could it be shot at 1/250 at f1.4? Only if the camera's sync speed is slower than 1/250 sec.
Here I'm not even talking about flash power as the assumption is that the flash output is constant. Obviously in practical terms, using such a wide aperture may be impractical or counter-productive as one would need to use ND filters, increase the flash working distance, etc. to throttle down the flash output to prevent overexposure. These are remedies to reduce light output but it doesn't prevent the use of wide apertures.
Last edited by creampuff; 20th February 2007 at 12:45 AM.
E.g. if you set your flash for ISO100 f/8, you can use 1/25s, 1/100s, 1/250s with f/8. You will get the same exposure no matter what shutter speed you use as long as the aperture and ISO remains the same.
You only take flash power, ISO and aperture into consideration when using flash. You can use any shutter speed and it will not affect the exposure. You just need to ensure that the shutter speed is lower than your sync speed or slower than the flash exposure. This is because the flash duration is very short and is shorter than your shutter speed under normal circumstances.
Last edited by Scaglietti; 20th February 2007 at 04:17 PM.
another way is to move the strobes further away from the subject
or find some other way to cut the amount of light reaching the subject or sensor
if flash output is constant
and the meter says that it should be f11 @ 1/60s
and if your camera's flash sync can go up to 1/200s
then using f11 aperture you can use any shutter speed from 1/200s and slower (1/125, 1/60, 1/30, 1/15 and so on )
but not to slow as the ambient light will also be captured.
funny how the TS never appear again, while everyone is hot under the collar over the flash sync speed and watnots....
to get back to the original question, yes, u can. but u have to dial down the power of the flash or modify the light like siao to prevent over-exposure.
ortega sums it up best. definitely got carried away
sound very werid. who uses f1.8 studio flash. your flash power is less than 200w ?!?!!? WTH. i haven touch f2.8 even. aperture most used was f5.6