The Star Analyser mounted in front of a telephoto lens fitted to a Digital SLR camera works remarkably well on bright stars. Because the light from the star is...
... with ... Hi Robin For these tests you used a 100 lines/mm Star Analyser grating with a Canon 350D camera fitted with a 75-300mm zoom lens at 200mm focal ...
... with ... Hi Robin The small grating aperture produced some vignetting but not so severe that it could not be removed using a flat field. Ok but what is...
... I have not tried it but I think it is easier to use the Star Analyser :-) You will need a much shorter focal length lens with a 500l/mm grating if you want...
Hi Robin, wouldn't a slight camera lens defocus increase star size? Regards, Richard ... Analyser :-) ... grating if you ... the star ... cover all the ... ...
Hi Richard, That would work too, but using drift to trail the spectrum perpendicular to the dispersion would give better resolution as the star size would not...
Alex, I'm unable to get your link to work! If you want to use a 1200lpm grating, the solution will be to use a reflection grating and build a classic/ Littrow...
Hi Alexandros, Probably the simplest way to record the solar spectrum using the Star Analyser is to use the reflection of sunlight off a needle instead of...
Hi all, At mag 7 this object is an absolute must for anyone with a spectrograph who lives far enough South. A spectrum may well determine what sort of object ...
It is possible to take spectra of bright stars without a telescope or tracking mount. Just fix the Star Analyser on the front of a DSLR with a telephoto lens,...
Thanks Robin - excellent - there's no excuse not to try stellar spectroscopy :-) Nytecam ... or ... with ... camera ... take ... spectrum ... spectral ... ...
Hi Ken - although it doesn't directly answer your query I 'picture' the illumination of a transmission grating in the convergent beam of a telescope like this...
Gavin, A very good illustration of the problem/ solution! My difficulty was accepting that only a relatively small number of the available lines are producing...
At mag 14 currently, this supernova should just be in range of the Star Analyser from a reasonably dark site and a CCD astro camera. It is type 1a (the...
Thanks Robin - that's two mags fainter than you example in 11m exposure so about 60m exp needed for this new SNe which begs the question - How low can the...
Hi Maurice, In this case the signal/noise at mag12.5 was easily good enough to identify it as type 1a. I have a few examples of fainter spectra but it does...
Hi Robin - recorded the SN tonight under a bright gibbous moon via my 70mm f/5 ETX but only the field and no spectra attempted. It may be a difficult spectral...
Ah yes, that's a tough one. Those three stars are very close. I guess by orientation the grating vertically in the image you might possibly be able to split...
Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the staranalyser group. File :...
staranalyser@yahoogro...
Dec 10, 2008 7:14 pm
1344
good evening, on 03 dec. 2008 I took the spectrum of eps Auriga how ? with the proposition from Robin: The Canon D350 with objective 200 mm and the SA fixed on...
Hello Dominique, can you tell me what angs/pixel you achieved with your setup? I agree with your comments that this method of capturing spectra is very quick...
Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the staranalyser group. File :...
staranalyser@yahoogro...
Dec 11, 2008 7:10 am
1347
good morning, i send the image of eps Auriga in the user files of the group(11dec 2008) the dispersion is 3.25 Ä/px i have not other spectra of calibration...
Hello Dominique, I have overlaid my spectrum (and a spectrum from OHP) on yours and put the result in your folder. The Sodium line is at 5890 (Actually 2 lines...
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