WIDE FIELD SURVEY


Optic: Canon 85 mm f:1.2 L @ f:2. Camera: Standard Canon 40D at ISO200. Mosaic of nearly 200 fields exposure (RAW 3900 x 2600 pixels).
Processing: Iris software. Exposure: 3 x 30 seconds for each individual frames.
The assembled image is reduced by a factor 0.2X relative to the original (the size of the starting image is 50 000 x 37 500 pixels !).

Reduced view

 
Click here for display an anoted large version (0.2X scale factor, 10000 x 5300 pixels, 23 Mb).

Click here for display a unanoted large version (0.2X scale factor, 10000 x 5300 pixels, 23 Mb).

Note the presence of two comets in the field. The images are taken in suburban condistions (naked eye limit magnitude 2 to 3)
 

Image aspect comparison relative to the scaling factor (1.0x = original scale of RAW Digital SRL)


Acquisition condition of the images, from Castanet-Tolosan Observatory, near Toulouse (France) - Note the suburban sky!
(left a Stellarium software similation, right a Canon 5D + Peleng fisheye lens view - February 3, 2008 - 23h15 UT)


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