In our recent 17 hour SHO lagoon, the Hourglass was slightly burned out. Last night, waiting for our main target to come up, we did 3 x 10 min subs in each channel, and processed to show maximum detail in the tiny hourglass.
Processing: Median combine, zero point to foothill of histogram, rough colour balance, separate into stars and starless background, working starless make background colour neutral, wavelet sharpen, add back H-alpha stars as white. All in GoodLook 64
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Here is a tight crop (0.55 sec arc/pixel) around the Hourglass.
Best,
MnT