The first light, 30 seconds exposure at
ISO1600, no Darkframe. Camera temperature
was at 15°C.
Uploaded at: 2016-10-30 11:16:56
The Great Orion Nebula (M42)
The second light, 30 seconds exposure at
ISO400, no Darkframe. Camera temperature
was at 15°C.
Here you can see the problem using a
achromatic lens for imaging!