Multiple Exposures

[brian_utley]

I am wanting to experiment with multiple exposures. If I have a

scene that would require a 1/60 at f4, would I shoot each of the two

exposures at 1/30 f4 so the two exposures together would get me a

proper exposure?

[jimvanson]

Close Brian -- If you require 1/60 you would require 2 exposures of 1/125 for a total of 2/125's which equals 1/60.

[brian_utley]

ah yes, I had that flipped. thanks! i guess the trick is, with myself in both exposures, each location that I am at, I will underexposed at each location by 1 stop. correct?

[jimvanson]

Yes Sir!

[lex_jenkins]

Depends on the situation.

 

For example, take a look at the attached photo of a ridiculously large full moon over our lakefront. It's faked. Oh, sure, the full moon was out that night. But it was higher in the sky and at a different location.

 

First I slapped on a telephoto lens, carefully aligned the moon toward the upper right corner and exposed "normally" (which, for the moon, usually means 1/30-1/60 @ f/11-f/16).

 

Then, with the double exposure lever on my Nikon F3HP engaged, I recocked the shutter, put on a wide angle lens, turned the camera toward the right and recomposed so the full moon would appear to be just over the trees at mid-right. I relied on the F3's auto exposure mode to do the rest - it's surprisingly accurate for long duration nighttime exposures. (Note the star trails, while the moon itself has no "trail".)

 

So, in most situations, sure, you'd cut each exposure in half for a double exposure to be properly exposed. But not always.<div></div>

[lex_jenkins]

And here's a less successful variation on the same trick. This time I overexposed the moon so there's no detail. But the dock and everything else looks good. To fix it I suppose I could Photoshop in the better moon from the other shot, but I was hoping to produce a series of successful double exposures the old fashioned way, each on a single slide.<div></div>

[mo_zhang]

unless the background of the two positions you will be posing in are completely black, you will come out transparent.

[James G. Dainis]

And if the backgrounds are completely black, then you would take both exposures at 1/60,f4.

[j_smith6]

If you want to make phto with multi exposures-

= when you are exposure 2 times you must reduce everything for 1 diphram

= when you are exposure 3 times you must reduce everything for 1.5 diphram

= when you are exposure 4 times you must reduce everything for 2 diphram.

[j_smith6]

If you want to make phto with multi exposures-

 

= when you are exposure 2 times you must reduce everything for 1 diphram

 

= when you are exposure 3 times you must reduce everything for 1.5 diphram

 

= when you are exposure 4 times you must reduce everything for 2 diphram.

[imaginator]

This is the Film and Processing Forum... isn't it?

[ronald_moravec1]

If the exposures overlap on the frame, underexpose each 1 stop. The the secondary one is in a blank area, give two normal exposures.