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Hi, A compilation, for many discharges tube, of lines position and the implication for calibrate spectra (in relation with the spectral resolution or spectral region). You can downwload the atlas in the form of a PDF here : http://www.astrosurf.com/buil/specinti/Atlas_Spectral_Lamps.pdf Christian Buil

The technique I show is only suitable for relatively intense spectral lamps. For example, here the calibration of the red part of the spectrum by using an easy to find neon lamp + fibers on a 4-inch refractor - this gives a good reference for very precise calibration (powerful for high resolution H-...

Hamish, for the adjustment of the intensity, the solution is quite simple: I modify the distance "d" between the source (a simple E10 neon lamp, see down to the page http://www.astrosurf.com/solex/specinti.html ) and the input of the fibers. The intensity of course depending on the "d...

I'm developing the following precision spectral calibration : (1) The spectral calibration flux is permanent at the entrance of the telescope/refractor or semi-permanent (low intensity miniature lamps or low cost plastic optical fibers (1.5 mm diameter, 25 euros for 100 meters - see Amazon - see pho...

Pour info, une vidéo concernant un atelier Star’Ex sur ZOOM qui c’est déroulé le 21 janvier : https://youtu.be/A5V6xnmRyZ8

Ainsi qu’un PDF des planches ici : http://www.astrosurf.com/buil/specinti/ ... StarEx.pdf

Christian Buil

Spectrum of T CrB taken the 12/01/2021 by using a 4-inch refractor and a Star'Ex spectrograph at power resolution of R=20000: http://www.astrosurf.com/buil/forum27/_tcrb_20220112.png The spectrum can be downloaded here: http://www.astrosurf.com/buil/forum27/_tcrb_20220112_111.fits Christian Buil

Publication d’une vidéo montrant l’usage de Star'Ex sur un instrument relativement modeste (lunette de 100 mm) et une petite introduction à specINTI. La vidéo est en deux parties, jour et nuit : Partie 1 (le jour !) : https://youtu.be/8uupSa9wXaU Partie 2 (la nuit !) : https://youtu.be/ccyvpIxm3Nk (...

J'ai le plaisir de vous annoncer la sortie des logiciels de traitement de spectres specINTI et specINTI Editor. Vous pouvez les télécharger et consulter la documentation à cette adresse : http://www.astrosurf.com/solex/specinti.html Il s'agit d'applications écrites en Python, pouvant tourner sous Wi...

Hi,

The level of astigmatism aberration is proportional to the power 3 of D/F ratio.
The level of spherical aberration is proportional to the power 2 od D/F ratio.

The difference between f/5 and f/10 is considerable in terms of image quality (better at f/10 of course).

Christian

A spectrum of the event taken nearly at the same date of your spectrum Robin. I use a 250mm f/4 Newton + a Star'Ex spectrum (low cost 3D printing setup) in a low resolution version (R=750): http://www.astrosurf.com/buil/forum27/_pnvj030227_28+191754_5_20211129_78.png http://www.astrosurf.com/buil/fo...