29 March 2006
Gundogdu - Turkey
A Pixels & Cassoulet expedition !
Left, the wide-field experience (400 mm lens + Canon 5D), right, the spectroscopy experience (Canon 24-70 + Canon 350D).
The fisheye experience (Peleng 8 mm & Canon 10D).
Transit of the moon umbra
Fisheye lens Peleng 8 mm stopped at f/8 - Canon EOS 10D DSLR - ISO 400 - Expoure: 1/90 s. A new image each 10 seconds.
Click here for download file fisheye.mov (2.4 Mb)
Click here for download file fisheye2.mov (better quality - 4.2 Mb)
Left: second contact, mid: the totality, right: third contact.
The third contact
Peleng 8 mm fisheye + EOS 10D
7 seconds before third contact.
8 seconds after third contact.
60 seconds after third contact.
4 minutes after the third contact.
The second contact
Canon lens EF 400 mm 1:5.6 L (used at f/5.6) - Canon EOS 5D DSLR - ISO 50.
Exposures of 1/200 s at ISO 50 with a linear polarization filter in place (nearly absorption of 50%)
Click for display the images at its original size
Inner corona near the time of second
8 x 1/20 s + 8 x 1/3 s (polarization sequence)
A radial filter is used for enhance the contrast (Iris implementation)
Canon lens EF 400 mm 1:5.6 L (used at full aperture) - Canon EOS 5D DSLR - ISO 50.
Inner corona: Stack of 8 x 1/20 s exposures through a linear polariser - rotational gradient processing.
Outer corona: Stack of 2 x 2 s + 2 x 1 s exposures (no optical filter) - The diffuse corona is removed (fitted by a Lorentzien function).
Photosphere image incrustation: 1/8000 s through an Astrosolar ND=3.8 film (image taken some minutes before first contact).
The saturated part of the image (non-valid data) is masked with a dark disk.
Small (1096 x 730)
Medium (2193 x 1460)
Large (4386 x 2920)
Field stars identification
The scale of the image is of 4.2 arcsec/pixel
Large (4386 x 2920)
Detail of a rectilinear plume.
Image of the
Canon 400 mm lens + Canon EOS 5D - 6 seconds exposure at ISO 50.
Mid-exposure start 15 seconds only before the third contact (the right side of the image shows some bloom).
Measure of the sun's corona polarization
For details, click here
Polarization degree of the corona.
Canon lens 24-70 mm 1:2.8 L used at f/4 + Canon EOS 350D (ISO 100). Grating: Jeulin 300 g/mm in front of the objective.
Left, zero order. Right, first order. Exposure: sum of 3 x 1/30 s. The green line Fe XIV at 5303 A dominate the coronal emission.
Second order spectrum. Exposure:
sum of 3 x 1/4 s. The green line at 5303 A (Fe XIV) is the principal feature.
The small dot are from the spectral emission of the chromosphere.
See also the 1999 spectrum.
Le groupe Pixels & Cassoulet à Istambul. Dernier jour du voyage !
De gauche à droite, Pierre Thierry, Alain Klotz, Christian Buil, Valérie Desnoux, Michelle David, Raymond David, Michel Pujol, Robert Delmas.
Sur la gauche, le Bosphore et la Grande Mosquée.
The Valérie Desnoux page
The Alain Klotz page.