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Thanks again, Fred. I found something interesting (and somewhat even more puzzling) in an article of Professor Morison's Astronomy Digest: " It is often not well noted that a single dark frame is actually quite noisy and will add noise into an image..." And so the author offers a second option...

Hi, I just wonder if NR (noise reduction) is worthy of a star trail photo taken by a long exposure, e.g., 30 min. It'll take another 30 min to finish NR after shutter is closed. Is the NR effect equivalent to the long waiting time? (I guess that after shutter is closed, the camera, etc. can be...

Before and after sunset

1st image (April 26): 2nd image (May 12):

My first double-exp photo: "The last rose of summer" Already? It's not even summer yet!

Hi, Is it possible to load back some NEF and JPG files to the camera memory card from Mac? I use a card reader to download from the memory card and then delete them from the card:hurt: Now I hope someone can give me a quick hand... (photo files are downloaded by a card reader to 1. Dropbox acc...

Another possibility: single-exposure (a matter of calculating and setting exp time)

Ok, "double-exposure in camera" is. So basically you take two individual shots and then use image overlay in retouch menu to blend. The example below (from slrlounge) shows a very impressive and interesting 2-exp result with the settings: “Silhouette Image”: 24mm, ISO 100, f/5.6, 1/1000 sec...

I am wondering if it is possible to shoot a photo like one below (from National Geographic) by a regular DSLR camera? What kind of settings are used? I am thinking of maybe long exposure... Appreciate verification and tips.

A raining day (as usual) in San Francisco: (Bamboo is not a tree, but a kind of grass?

Above or below

Needa, I tried some re-processing: 2 more instances of reducing exposure -- until everything is dark; "Color reconstruction" as the article recommends -- with little effect; "Highlight reconstruction" (also mentioned in the article, but not the primary option) -- with "Reconstructing in CL"...