ecce_lex

I always thought the spectrum should be as spread as possible, and one had to compensate by long exposures for low light that comes with the spread. I guess the software can read short spectrums without too much trouble? 6mags is huge - hadn't realised the difference was so great. I had noticed - and this was quite a surprise - that the spectrum itself often asks for HDR images, as some emission lines are considerably fainter than others, which makes you expose differently for different areas of the spectrum.

Thank you all for your input. The reason I suspected the star anaylser to be lower quality was because it has comparatively fewer traits / mm. This does not seem to be the unique criteria, as I have now learnt, so please accept my apologies as I had no intention of offending anyone, especially not the person who designed it That being said (and now that my ignorance has surfaced) I shall gladly dig in the documentation you have been so kind as to provide me with. I am familiar with C. Buil's literature as well as the various (french speaking) forums he's active on... somehow I got stuck on th

Thank you for the info & hints Merlin. I shall properly align, orientate and present the spectrum as you suggested. You speak of "objective grating" - I deduce that there would be a "focal point" grating option? Seems to me that the screw-on "star analyser" is quite poor quality...

Hello, I have acquired a 1000 traits/mm diffraction grating that I stuk on a regular photo clear filter. I use it with a 11mm and a 200mm lens. The setup and a sample of what kind of spectrum I get can be seen below. It seems to me that resolution is not so bad - considering it sharply increases at longer focals The source of this spectrum is a street lamp - mercury and sodium I believe. The plan is to adapt this to the astro setup, but I still need to find some calibration software...

Hello SGL, I have joined interested in astrophotography, optics in general and spectroscopy. I play with focal lengths ranging from 11mm to 4m and apertures up to 200mm. I use a modified 7D and a regular 350D for imaging, the EQ6 and a standalone guidecam. The primary instruments are a 60mm APO refractor (370mm) and a 200mm schmidt-cassegrain reflector (2032mm). Lack of time, unfriendly skies, global conspiracies against me and sheer laziness usually prevent me from shooting hours and hours of exposures, so I don't produce high level, pixel perfect pictures. I do however consume cheese and red