Excuse me for answering so late! You should contact Dr.Daniel Sablowski, I think you know him…..The distance between the lenses is 109 mm +/- 1mm
Cheers Berthold
Search found 35 matches
- Thu Feb 16, 2023 6:39 pm
- Forum: Spectroscopes and Softwares
- Topic: eShel
- Replies: 5
- Views: 4136
- Wed Jan 25, 2023 3:31 pm
- Forum: Spectroscopes and Softwares
- Topic: eShel (II) progress, with problems
- Replies: 6
- Views: 5993
Re: eShel (II) progress, with problems
Dr. Daniel Sablowski has calculated a Petzval lens from two achromats with 1:2/109, which shows practically no error of the chromatic longitudinal aberration and due to the slightly shorter focal length than 135 mm still allows to use smaller chips (KAF 3200). I built the lens. Highly recommended
- Fri Dec 23, 2022 8:33 pm
- Forum: Software Demetra
- Topic: Resolution
- Replies: 0
- Views: 2098
Resolution
Lors de la réduction avec Demetra, peut-on lire quelque part quelle est la taille de la résolution dans les ordres respectifs ? C'est où s'il vous plait ?
Cheers
Berthold
Cheers
Berthold
- Mon Dec 19, 2022 9:58 pm
- Forum: Spectroscopes and Softwares
- Topic: eShel
- Replies: 5
- Views: 4136
Re: eShel
Le principal problème pour moi était que le eShel, équipé d'un objectif avec une focale de 135mm, produit un spectre qui ne rentre définitivement plus sur un KAF 1603 ou 3200. Il n'y a pas d'objectif qui ait une intensité lumineuse suffisante avec une distance focale de 100 mm et une aberration chro...
- Sun Dec 18, 2022 9:10 am
- Forum: Spectroscopes and Softwares
- Topic: eShel
- Replies: 5
- Views: 4136
eShel
en annexe, on peut voir une photo ThAr que j'ai prise avec l'eshel de Shelyak. Toutefois, ce n'est pas l'objectif Canon 1:1.8/85 qui a été utilisé, mais un objectif que j'ai construit moi-même et qui ne comporte que deux achromates. L'erreur chromatique longitudinale est de facto de 0 dans le domain...
- Fri Oct 16, 2020 8:19 pm
- Forum: Software Demetra
- Topic: What would you like to see in Demetra ?
- Replies: 24
- Views: 44459
Re: What would you like to see in Demetra ?
What would be the improvements or functions that should be implemented in Demetra? Graphic functions? automatisms? other things ? Here you have the floor to tell us about your development wishes for Demetra So don't hesitate to express yourself I try to reduce spectra created with CMOS ASI 1600 pro...
- Fri Apr 03, 2020 8:00 pm
- Forum: Spectroscopes and Softwares
- Topic: problemes avec la Calibration
- Replies: 0
- Views: 1987
problemes avec la Calibration
alf_cam30.png on vois deux spectra 2D consistant d’un spectre d’étoile (alf cam) et un spectre de ThAr superposé. Les distance des lignes de Na et des lignes de ThAr devrait etre le meme dans les deux spectres. Mais on voit la distance de Natrium et de ThAr n’est pas la meme. Quelle pourrait etre l...
- Mon Nov 18, 2019 7:38 pm
- Forum: Spectroscopes and Softwares
- Topic: Bad efficiency of the eShel from shelyak
- Replies: 20
- Views: 17653
- Mon Nov 18, 2019 6:45 pm
- Forum: Spectroscopes and Softwares
- Topic: Bad efficiency of the eShel from shelyak
- Replies: 20
- Views: 17653
Re: Bad efficiency of the eShel from shelyak
Hi,
I overlooked the message of Christian, I don’t know why. Please excuse me.
Martin Dubs pointed this out to me once more, not to use the “median filtering” .What I don’t understand: I used at time CMOS detectors, but it was the same.
Berthold
I overlooked the message of Christian, I don’t know why. Please excuse me.
Martin Dubs pointed this out to me once more, not to use the “median filtering” .What I don’t understand: I used at time CMOS detectors, but it was the same.
Berthold
- Tue Nov 12, 2019 2:58 pm
- Forum: Spectroscopes and Softwares
- Topic: Bad efficiency of the eShel from shelyak
- Replies: 20
- Views: 17653
Re: Bad efficiency of the eShel from shelyak
there must be a problem with ISIS
unfortunately I can't send *.xml
that's not a probleme of the hardware.
berthold