Horsehead Nebula
Four, five-minute exposures, "stacked" together.
The image was NOT taken in color, but was displayed in "Red-to_White"
false color with MegaFix and saved.
Four sets of 5 minute images, taken at F3.1, then made into a mosaic.
False color was again used.
Four unbinned images, taken at F2.1, two minutes each, then stacked. Notice
that the field of view at this F-ratio is almost the same as for the Mosaic
image, but larger in size, due to not binning the pixels. Also notice the
blooming that shows up with short exposure times at this low F-ratio.