proms May 15th and 16th with spectro in Littrow mode
Posted: Mon May 16, 2022 10:44 pm
Hello,
i've been working on a problm that's been nagging me for years! Why my images were a bit "shrunk" ?... I finally found the answer. in 1868 they were using prisms and the way they used it introduced no deformations. Diffraction had not been invented yet. Diffraction gratings used in a "classical config" produced whats called anamorphosis : the image is magnified or shrunk in the direction of the spectrum. Still, there is one way to use a grating without this problem : The Littrow design...
Here are the results...
Chris
i've been working on a problm that's been nagging me for years! Why my images were a bit "shrunk" ?... I finally found the answer. in 1868 they were using prisms and the way they used it introduced no deformations. Diffraction had not been invented yet. Diffraction gratings used in a "classical config" produced whats called anamorphosis : the image is magnified or shrunk in the direction of the spectrum. Still, there is one way to use a grating without this problem : The Littrow design...
Here are the results...
- littrow 1200 tm 3_20220515_155542.998_UT +++++++++.jpg (118.92 KiB) Viewed 593 times
- 1200 tmm littrow spicules_20220515_155518.753_UT comparaison anamorphose.jpg (184.69 KiB) Viewed 593 times
- image 1_20220516_121432.332_UT.jpg (25.04 KiB) Viewed 593 times
- 2022-05-16-1437_4-CI-R-Sun_Halpha++++_F1647-1784 restacked annotée.jpg (306.63 KiB) Viewed 593 times
- 1800 trmm mode littrow ++ grand best++++++++ annotée.jpg (204.37 KiB) Viewed 593 times
- 600 tmm Littrow +++ annotée.jpg (173.53 KiB) Viewed 593 times
- 600 tm littrow grosse protubérance + best_ mode coro.jpg (279.19 KiB) Viewed 593 times
