[avandonk]

You can get more resolution from your sensor if you dither between exposures and upsize the images before stacking.

In the case of my Canon 5DH with a pixel size of 8.2 micron and a 300mm lens at f/3.5 the Airy disc is 4.5 microns in diameter at green wavelengths. So theoretically if the lens was perfect i.e. diffraction limited the lens has more resolution than the sensor. The situation is actually worse than this because of the Bayer Matrix and Anti Aliasing filter.

For dim stars your optical system actually does better than the diffraction limit as the Airy Disc is not uniform and is peaked.

I upsized by a factor of 1.6 before stacking each exposure stack.

I further enhanced the final HDR image with slight star reduction and RL enhancement after enlarging further by a factor of 1.4. This is a total of enlarging from the native pixel size of the sensor by a factor of 2.24. In sensor size it is the equivalent of 12.7MP to 64MP!

Here is the final image downsized to the native pixel dimensions. 4000x2655 pixels 6MB

http://d1355990.i49.quadrahosting.co...carnehdrSN.jpg

Here is the full size enhanced image 8834x5864 pixels 18.7MB

http://d1355990.i49.quadrahosting.co.../carnehdrM.jpg


If you want to get a maximum quality version of the full size (for a jpg) here is a 40MB version

http://d1355990.i49.quadrahosting.co.../carnehdrL.jpg

You will have to zoom in using your favourite image viewer on the downloaded images to see the vast improvement.

I also used a new version of EasyHDR to redo the image. The controls are now better and easier to use.

Bert