Multiple exposure can HDR?

[photographique]

Just wondering if using multiple exposure on SLR, can it have some HDR effect?

Thanks!

[zoossh]

yah, HDR makes use of multiple exposure of the same composition to create high dynamic range. but if you mean multiple exposure of altered composition ie. with a moving subject, might be difficult.

[J-Chan]

as in two or more exposures on a single frame of film? you'll just get an overexposed image..

[photographique]

Originally Posted by zoossh yah, HDR makes use of multiple exposure of the same composition to create high dynamic range. but if you mean multiple exposure of altered composition ie. with a moving subject, might be difficult.

Sorry, I actually meant film.

So, it is possible to have a HDR-like image using multiple exposure when shooting flim, by exposing 2 or more times on the same frame?

Originally Posted by J-Chan as in two or more exposures on a single frame of film? you'll just get an overexposed image..

...

I thought it was possible since the second or the third exposure are layered together with the first with reduced opacity?

[ExplorerZ]

Originally Posted by photographique Sorry, I actually meant film. So, it is possible to have a HDR-like image using multiple exposure when shooting flim, by exposing 2 or more times on the same frame? ... I thought it was possible since the second or the third exposure are layered together with the first with reduced opacity?

obviously the film will go overexpose... you are basically increasing the exposure time. in Digital you start from 0, 0, 0 on the 2nd shot but not film

[zoossh]

Originally Posted by photographique Sorry, I actually meant film. So, it is possible to have a HDR-like image using multiple exposure when shooting flim, by exposing 2 or more times on the same frame?

does not know film darkroom techniques. theoretically, you need to reduce the exposure of each frame so that when add on, they would not become overexposed. even for digital, HDR also makes use of different opacity of different layers.

[J-Chan]

but doesn't film already have a higher dynamic range than digital? or am I wrong..

[photographique]

Originally Posted by ExplorerZ obviously the film will go overexpose... you are basically increasing the exposure time. in Digital you start from 0, 0, 0 on the 2nd shot but not film

No..not increasing the exposure time, that's not really multiple exposure.

[zoossh]

Originally Posted by J-Chan but doesn't film already have a higher dynamic range than digital? or am I wrong..

but not as wide as HDR

[ExplorerZ]

Originally Posted by photographique No..not increasing the exposure time, that's not really multiple exposure.

well its not, but by exposing the same film twice in a "normal" and "over" exposure is somewhat like slowing the shutter by twice. unless you are talking about using 2 different film and then try to layer them in darkroom...

[photographique]

Originally Posted by ExplorerZ well its not, but by exposing the same film twice in a "normal" and "over" exposure is somewhat like slowing the shutter by twice. unless you are talking about using 2 different film and then try to layer them in darkroom...

Is it?

Hmm...I still don't think so, but must try.

Multiple exposure won't overexpose the same film lar...

[grantyale]

Originally Posted by photographique Is it? Hmm...I still don't think so, but must try. Multiple exposure won't overexpose the same film lar...

Multiple exposure with the same aperture of the same scene equals exposing a single time with shutter speed = sum of all exposures. It won't make any difference to the dynamic range. On film, the only way to increase dynamic range is to selectively expose - eg. using gradual ND filters, or multiple exposures with careful covering of part of the lens (is this practical?).

If you'd like to think in Photoshop - it's like stacking layers in SCREEN mode.

[cantaresg]

It's possible. You take the first frame of the landscape with the exposure setting of the landscape, while covering the scene of the sky. Without forwarding the film, you cover up the lower half of the scene, and expose for the sky. That way you can actually HDR.

[catchlights]

Originally Posted by photographique Is it? Hmm...I still don't think so, but must try. Multiple exposure won't overexpose the same film lar...

let say correct exposure is f8 1/250s, exposed the same frame with same exposure twice, is over 1 stop.

exposed the same frame with same exposure 3 time, in over 1 1/2 stops.

exposed the same frame with same exposure 4 time, in over 2 stops.

exposed the same frame with same exposure 8 time, in over 3 stops.

HDR effect is using digital post production, you can't do that on film

you can't do multiple exposure on film to get HDR effect.

[catchlights]

Originally Posted by cantaresg It's possible. You take the first frame of the landscape with the exposure setting of the landscape, while covering the scene of the sky. Without forwarding the film, you cover up the lower half of the scene, and expose for the sky. That way you can actually HDR.

that, is call masking, one of the photography special effect on film day.