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Multiple Exposure in a Single RAW file???

Discussion

7 replies
Posted by Steve Sieren on October 24, 2008 at 2:54 PM
Does anyone know if the Canon 5D has the ability for multiple exposures in the same single RAW image file?? Or if the new 5D will be capable of that?

Sorry guys I should of elaborated. Josseph Rossbach has a multiple exposure with the moon and trees like a multiple exposure w/ film. So I guess only Nikon. Thanks guys appreciate the help.
Posted by Guy Tal on October 24, 2008 at 3:05 PM
Steve, some Nikon cameras offer a form of in-camera HDR from multiple exposures. In my opinion this kinda defeats the purpose of raw capture though since the camera needs to process each frame and merge them based on some built-in algorithm, which is pretty much the opposite of why you want raw capture to begin with.

Tools like Photoshop give you a LOT of options for merging multiple exposures. Doing so in-camera is at best very limited in comparison.

Guy
Posted by David Bostedo on October 24, 2008 at 4:42 PM
Well, Guy, I think some cameras also allow simply layered RAW data - no HDR or fancy processing. They'll underexpose each shot properly so that the final shot is properly exposed, even though made from several exposures. This can be used, for instance, to capture some motion blur (although each frame may not have motion) and other artistic effects. I'm pretty sure some of the flora guys here use it this way. I'm not positive it actually works in RAW and not just JPG though.

In any case, I have no idea if the 5D MkII will have a feature like this...
Posted by Robert Fisher on October 24, 2008 at 7:36 PM
No Canon DSLR offers a multiple exposure feature and no Canon DSLR is likely to offer a multiple exposure feature in the near future. Canon film SLRs were known for having this feature throughout the line from the earliest EOS the 620. It's a feature that's definitely lacking in their DSLRs. I've asked Canon about it in the past and have been told they have no plans to put it into any of their DSLRs. I've seen nothing in any of the previews of the 5D Mk II to indicate Canon's position has changed.

A few Pentaxes and a couple Nikons have multiple exposure features. The Pentaxes can do up to 9 and I think the older Nikons can do up to 2 (I'm not positive on that) while some of the newer ones like the D3 can do up to 10. David is right that the exp. comp. is automatic in the Pentaxes and I don't think it can be turned off. The feature, particularly in the Pentaxes, is useful for creating the impressionistic look. Doing these after the fact in PS or other software isn't as good as doing them in camera.

With the Nikons (at the least the D3) the multiple exposure feature can be used to create an in camera quasi-HDR by turning the auto exp. comp. (they call it Auto Gain) off. In this case you'll get, say, 5 shots layered together at different exposure settings which will give you the broader dynamic range you're looking for. I don't know how well it works. It's not true HDR because you're not working with 32 bit HDR files and aren't doing any tonemapping. It's more like an in camera blended exposure than HDR.

In the cases of both the Pentax and the Nikons; however, it's not a multiple processing of the same RAW file. It's multiple, individual RAW files that are being combined.
Posted by Steve Sieren on October 24, 2008 at 8:30 PM
Definitely don't want to do any HDR work in camera.
Posted by Toni Lankerd on October 26, 2008 at 8:08 PM
With the Pentax K10D (and more than likely the 20D as well), you can set the options in the Menu to either auto adjust the exposures or not......your choice.
Posted by Robert Fisher on October 27, 2008 at 8:25 AM
Thanks Toni. I wasn't sure if you could or not with the Pentaxes.
Posted by Steve Sieren on October 27, 2008 at 11:10 AM
Thank you Toni, glad to find that out.