spectro-aras.com

Tom, The optimization of eShel for very fast optical beams is another area of ​​work that I analyze. There are a lot of things: (1) the characteristic aperture of the current guidance module is near f/5, and clearly a fast telescope from f/3.5 to f/4.5 is poorly exploited at the present time (it is ...

I have added more info about the computation of RSB and also I have introduced a simple and nearly global criteria for evaluate all the imaging detector, CCD or CMOS, the detectivity (D*), given by the formula: D* = (f x QE x p^2) / RON with, f, the binning factor, QE, the quantum efficiency at a gi...

This ASI294MM is not a so bad product. One quality for me is the size of the sensor for the price. Concerning the noise, the interpretation of the values is nether an easy task. For a correct analysis it is important to compare cameras with the same equivalent pixel size, an ASI294MM with these pixe...

An evaluation page of rhe very new camera ASI294MM, in French AND in English

http://www.astrosurf.com/buil/asi294mm/

Christian Buil

Une mise à jour assez complète de ma page sur l'optimisation de eShel :

http://www.astrosurf.com/buil/asi6200mm/

(but still in French for the moment, really sorry).


Christian

I am currently testing an ASI294MM. The results are coming in no time...

Christian

Yes, it is the 135 mm F/2 L !

Christian

I present the measured comparative efficiency of gratings (used in UVEX, but the purpose is general) in function of the blaze model selected. ThorLabs models. Comparison of a 300 l/mm blazed at 500 nm and a 300 l/mm blazed at 300 nm: http://www.astrosurf.com/buil/forum25/_RATIO_300t_blaze500_VS_blaz...

Michel, je dirais q'avec une erreur d'angle de 0,5 à 0,7° (ce qui commence a être une grosse erreur bien visible dans l'image), il n'y a pas vraiment de soucis. Donc il y a une certaine tolérance. Pour des angles plus forts, il y des risques d'accroissement de l'incertitude de mesure, notamment avec...

Michel, Tu es un fin observateur Michel... oui le spectre est plus large à gauche qu'a droite est c'est un pur effet de Keystone que l'on voit là. Donc c'est bien la géométrie de l'optique, et cela ce voit bien sur d'autant mieux que le spectre est large. Ton décalage vient du fait que les traits du...