Foton Pharming from FRO





ASIMOPLAN

When using relatively small sensing chip video cameras on larger telescopes
for deep-sky imaging, there is a trade-off, and that is a small field of view.
A way to get a wider field and retain that high magnification and resolution, is to make an
image using multiple frames stitched together in a mosaic.
A fantastic tool for planning out such imaging projects is Asimoplan by David Loyd-Jones.
Here are a couple of examples where I have used this multi-field image planner to create a high resolution, wide field image.
The first image below is a screen grab of the planning stage using Cartes du Ciel with the Asimoplan program boxes producing a grid overlay on the Eta Carina Nebula. Each field has a 15% overlap.

The resulting image shows a section of the nebula, NGC 3372 and star clusters, around Eta Carina.
Mosaic of 3 x 4 images, each is 100 x 2.56sec video frames with GSTAR-EX deep-sky video camera through 31 cm f/5 Reflector.
Stitched together and processed in Photoshop CS2. Only a mild enhancement of the levels was done so as not to burn out the star clusters and to make the scene reasonably close to what is seen through a large telescope. See here for my colour version of this image.

For the next object, I got a bit more ambitious and did a 4 x 5 mosaic of Cluster and Nebula, IC 2948.
The screen grab shows Cartes du Ciel, the Asimoplan grid overlay with overlap of 8% and field numbers.

Mosaic of 4 x 5 images, each is 100 x 2.56sec video frames with GSTAR-EX deep-sky video camera through 31 cm f/5 Reflector.
Stitched together and processed in Photoshop CS2.
Only a mild enhancement of the levels was done so as not to burn out the stars and to make the nebula reasonably close to what is seen through a large telescope in a dark sky.

This image is reduced from the original by 33% to fit the web page.
See here for my colour version of this image.

I have created many more mosaic images to date and they can be seen on my DEEP-SKY IMAGES page

See this tutorial on how to merge multiple images in photoshop.