M42, the great nebula in Orion. 100mm f/9 Sky-Watcher apochromat, focal-plane photo with Nikon D3100, 22 exposures 30 seconds at 3200 ISO, stacked in Siril and adjusted to subtract San Francisco’s sky-glow with Pixelmator.
![](http://timberwoof.com/wp-content/uploads/2021/03/pp_M42_pixelmator-900.png)
M42, the great nebula in Orion. 100mm f/9 Sky-Watcher apochromat, focal-plane photo with Nikon D3100, 22 exposures 30 seconds at 3200 ISO, stacked in Siril and adjusted to subtract San Francisco’s sky-glow with Pixelmator.
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