M20 Trifid Nebula Widefield in Halpha, [OIII] and Blue

Click image to enlarge, click here for highest resolution

For an Halpha-only image of this area click here

Taken on July 1 and 7, 2005 from Fremont Peak State Park in San Juan Bautista, Ca.

AP180EDT f/9 imaging scope used at f/6.75

AP 0.75x Telecompressor

FLI IMG6303E imaging camera @ -30C (Halpha data), and -35C ([OIII] and Blue)

AP80/900mm guidescope

SBIG ST7E guide camera

FLI CFW7 color filter wheel

3nm FWHM Custom Scientific Ha 50mm AR-Coated filter

3nm FWHM Custom Scientific [OIII] 50mm AR-Coated filter (500.7nm)

Optec IR-Blocking unmounted 50mm Blue filter 

6 exposures of 15 minutes through Ha filter

10 exposures of 15 minutes through [OIII] filter

8 exposures of 200 seconds through Blue filter

4 hours 26 minutes total exposure time

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