Wednesday, 26 February 2025

Orion's Lower Limb .

This six section mosaic was taken on 8 separate evenings . 

I was using an Atik 383L mono CCD camera piggybacked on my ten inch reflector with a 200mm lens and  Astronomik  narrowband filters attached to the front of the lens, HA , O111 and Blue, 

I captured five minute sub frames with matching dark frames and combined them with flat field frames to reduce the effect of noise and vignetting in the final image . 

The total exposure time for each section was 90 minutes using a HA filter , 15 minutes using an O111 filter and ten minute using a blue filter .

Click on an image to get a closer view