Quote: I am not sure what you are referring to, so I guess not. The one problem that I run into with these types of shots is the amp noise showing up as magenta areas in the image.
Yeah, that is about what I get. What do you do to get any sort of clear image? Amazing!
By the way, noise reduction is done by the camera taking a "dark frame" after a long exposure. This involves the camera actually taking a second photo with the shutter down, right after you take you initial long exposure. Since electronic noise occurs with a repeatable pattern, this dark frame will contain only noise. This can then be subtracted from the original image, thus reducing noise.
Sadly, to work, the "dark frame" must be created with the same parameters as the original image. Same ISO, and same shutter speed. In other words, a 30 second exposure requires subtraction of a 30 second dark frame. A 10 minute exposure requires a 10 minute dark frame exposure to be created. Which of course results in a 20 minute gape between taking photos.
This is why people are so upset that Pentax FORCES dark frame on long exposures. If you are trying to catch lightning, for example. A 30 second or longer gap is a LONG time to miss potential shots.
If you are taking a lot of long exposures, you can do this same dark frame subtraction yourself, and do so by creating your own library of "dark frames". Thus you do not need to wait after each image is taken. You simply take you dirty noisy images, then go back to you library and "subtract" out the noise using the corresponding dark frame image.