British Astronomical Association
Supporting amateur astronomers since 1890

Secondary menu

Main menu

BAA Community

M101 enhanced using a duo-band filter with a OSC camera.


Expand image

About this observation
Dean Ashton
Time of observation
24/03/2020 - 21:00
Observing location
St Austell, Cornwall UK
Celestron 9.25 EdgeHD with 0.7x focal reducer
Celestron Nightscape 10100 OSC Camera
Off-axis guiding with LoadstarX2 Guide Camera
Optolong L-Pro and L-eNhance filters
/f7; 75x600s with L-Pro filter: 30x600s with :-eNhance filter; 1x1-binning; total integration time was 17-hours and 30-minutes.

I had previously posted this image of M101 taken with 75x600s light frames captured on the 15th, 23rd, 24th and 25th March with an Optolong L-Pro filter.  I have now added a further 30x600s light frames taken on the 15th and 26th March with an Optolong L-eNhance filter.  The difference is a significant enhancement of the red hydrogen-alpha regions in the galaxy.  

The L-eNhance filter allows transmission at the wavelengths of Ha, Hb and Oiii.  It brings narrow band possibilities for the one-shot-colour camera user.  In this image 75% of the frames were shot with the L-Pro (luminous) filter and 25% with the L-eNhance (narrow band) filter).  

Copyright of all images and other observations submitted to the BAA remains with the owner of the work. Reproduction of the work by third-parties is expressly forbidden without the consent of the copyright holder. For more information, please contact the webmaster.