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| William Shaheen | profile | all galleries >> Astronomy - Astronomical objects, images and astronomy related projects >> Flat Field Exposure Testing | tree view | thumbnails | slideshow |
 One of 12 original light frames - unprocessed |
 Boosted to show vignetting |
 White poster board |
 Telescope aimed at white poster board |
 First flat at 1/25th sec. |
 1/60th sec |
 1/125th, And so on ... |
 1/250th |
 1/320th |
 500th |
 800th |
 1000th |
 1250th |
 1600th |
 And now, the reults when applied to light frames. |
 q. CombineFilesExcAvg-60th.jpg |
 r. CombineFilesExcAvg-125th.jpg |
 s. CombineFilesExcAvg-250th.jpg |
 t. CombineFilesExcAvg-320th-2.jpg |
 u. CombineFilesExcAvg-500th-2.jpg |
 v. CombineFilesExcAvg-800th-2.jpg |
 w. CombineFilesExcAvg-1000th-3.jpg |
 x. CombineFilesExcAvg-1250th-3.jpg |
 y. CombineFilesExcAvg-1600th-3.jpg |