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My fl is 900mm. 90mm at f/10.

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With a 2400 l/mm grating, and 900mm focal length for the optics used in the spectroscope, I calculated that the linear dispersion would be 0.35mm/Angstrom. So if you want a bandwidth of 0.4A, the slit width would need to 0.14mm or 0.0055 inches. That is not difficult to do.

- Dave

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Thank you Dave! That was my next project before I had to move. I am hoping to make an adjustable slit. I have some old veneer heads laying around. Now I just have to rebuild my metal shop. I think it will be a year before I can do ATM projects inside again. I have 3 of the objectives. I also have some prisms to make rotating slit motion. I never found the ones from old movie projectors so I am going to have to glue up some normal prisms. 4 sides will give me a start. If I find some old projector parts I can redesign later. I keep looking on Astromart for a large flat for a heliostat bu so far I have net seen one and had the money at the saem time.

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Could someone discuss what suitable parts from projectors will work for a SHS?

Thanks

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