(meteorobs) Meteor Spectra

[mark_vornhusen]

Ed:
Thanks for your help. This is a 50mm intensifier, so 120mm lens 
works just fine for me and I noticed 120mm gives me better image 
quality than 80mm lens. Does the g/mm value have an influence on the 
distance of the spectra to the meteor? My fear is that the spectra 
is often outside the field of view. 

I have an example video taken with 120mm lens here:
http://www.youtube.com/watch?v=6XTBrYWrey0


Mark

> >
> Mark:
> 	What you need is a replica transmission diffraction grating 
blazed for 
> the visual region of the spectrum.
> The lens you have on your system provides a very narrow field of 
view.  
> Can it be replaced with a shorter focal length lens.  I use a 50 
mm 
> lens on a 25mm intensifier with a 600 g/mm grating.
> 	You can check with the following manufactures for 
transmission 
> gratings:
> 
>            http://www.optometrics.com/products_gratings_t.html    
Max 
> size 50X50 mm
> 
> The best gratings are available from:  
> http://gratings.newport.com/home.asp    They make various sizes.  
Most 
> professional spectroscopists use these gratings manufactured by 
the 
> Richardson Grating Labs in New York.
> 
> Hope this helps:
> Ed Majden
> 
> http://members.shaw.ca/epmajden/index.htm
> 
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