AMATEUR ASTRONOMY PAGES
Javier Gómez Laina                                             M20 - M8  "Trifid" & "Lagoon" nebulas  in  Sagittarius
                       (click on image for a larger size)

Object:             M20  &  M8   - emission and reflection nebulaes -
Optics:             TeleVue TV-76 with 1.1x  flattener  (f 528mm). IDAS LPS filter.
Camera:           Canon 350d  DSLR modified (infrared filter removing)
Exposures:       39 x 240"  ;   156' total exposure
ISO:                  800
Date:                29 Jul 2005
Guiding:            MX716 on Celestron C-8
 

Processing:

ImagesPlus:
Darks & Bias calibration; average combining.
Digital Development Processing (DDP).

Registar:
images aligning

PhotoShop:
Curves and Levels adjust.
Noise removing with Grain Surgery Plug-in
Unsharp mask

PixInSight:
Dynamic Background Extraction (sky gradient correction)
Subtractive Chromatic Noise Reduction on Green Channel