D600 Setting for long exposure
A question regarding long exposure setting which I hope follow Nikonis can assist me with.
When I take a picture in "bulb" mode, it takes approx. the same amount of time to process after the shot. Is there a setting that will reduce the processing time?
Thank you all in advance.
#2. "RE: D600 Setting for long exposure" | In response to Reply # 0blw Nikonian since 18th Jun 2004Sun 14-Apr-13 09:45 AM
Well, it's not quite that simple. Yes, the correct first-order answer is to disable long exposure noise reduction. That is in fact what is consuming the time. You should be seeing "Job NR" blinking in the top LCD while this is happening. Whether or not you should disable the feature it is a different question. LENR is there to remove what's sometimes called "amp noise" - thermal buildup in the electronics, particularly in some parts near the sensor, can and often does cause fairly obvious errors in color rendering. Here's an example from a different camera:
Yes it's a terrible photograph, but it's pretty good for illustrating this problem even if for nothing else. The nut behind the viewfinder was pretty loose in this instance. The pinkish glow in the upper and lower right corners is NOT part of the image, or at least it's not supposed to be. That's amp noise, created by having some hot electrical components near those locations. I can't find the image at the moment, but one of my other cameras produces darker pink amp noise blobs on the center-left top of a landscape format frame.
Depending on your post processing skills, the content of your images, and the nature of the amp noise produced by YOUR camera model, you may be able to avoid the LENR time for some images. It is worth noting, however, that because this is a thermal problem, environmental conditions make a difference. This example was shot on a hot summer night; if memory serves it was probably still in the mid-80s (F) when this was taken. It is also relatively speaking not as bad as some as it was only a 15 second exposure. Had this been shot at 25F or worse, at -5F, and perhaps for 100 seconds, the amp noise would have been much more visible and probably also different. It's another file I cannot seem to locate, but I have another shot from this same camera (a D2h) shot at about 20F that shows not two but three amp noise blobs.
Attachment#1 (jpg file)
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#4. "RE: D600 Setting for long exposure" | In response to Reply # 2mirek21 Registered since 05th Mar 2013Sun 14-Apr-13 03:32 PM
True. However the D600 has almost no amp noise even for exposures several minutes long. At least for reasonable sensitivities and when the difference between camera sensor and ambient temperature is small. Moreover, when taking astrophoto pictures it is always better to take separate light and dark frames, average them and remove them in the post.
The huge disasvantage of in-camera Long exp NR is that the taking of pictures takes too long. Also enabling the feature halves the depth of the image buffer even for short exposures. Thats why always disable it.
#3. "RE: D600 Setting for long exposure" | In response to Reply # 0
To further Brian's comments, what the camera's Long Exposure NR does is take a second photo of the same duration, however, the shutter is closed. Then the camera subtracts the noise generated in the second photo from the 1st. That removes the "amp" noise from the original photo.
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