Originally posted by DogLover Good info. Thanks. I assume if you just intend to create B&W's that this is not as much of an issue? Or does it make even those look funky?
That was my final approach to one image was to convert to B&W.
I think if you have a desire to accentuate certain colors, such as to imitate a red filter, the purple cast might have some minor affect. But I don't think it will be that bad.
The only bad affect is that with long exposures (at least I have not seen with short exposures), the final multiple exposure composite may have streaks and a defined grid pattern on the image which is extremely difficult if not impossible to remove.
Sadly, although Pentax Digital Camera Utility can handle the color of such an image, the streaking is burned into the image and is a permanent side effect of the multiple-exposure.
All I can say is if you find this feature useful, you may want to contact Pentax and let them know that now with the K5 this feature is usable but noticeably broken.
They know about it, but obviously it is not high on their priority list... lost of other more important and widely used features to get done. :-) :-)
As they say, this problem has existed in all of the Pentax DSLRs with Multiple-Exposure capability back to the *istD.
This should be a somewhat gray image of water flowing around a rock and a tree top (water is about 15 feet higher than normal).
Instead it is rather purple with bright horizontal streaks. This was made with 9 exposures of about three seconds each.
And Close Up near the lower left corner you can see the grid pattern emerge:
The final B&W image is on Flicker, below. I did a bit of PS work to reduce some of the streaking, but its still not an award winner. :-)
http://www.flickr.com/photos/amoringello/5541602770/in/set-72157626303647618