WIDE FIELD SURVEY
Optic: Canon 85 mm f:1.2 L @
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 !).
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)