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Beaulieu Lens Collimation


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#1 Maurizio Di Cintio

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Posted 08 October 2013 - 04:17 PM

Hi all.

I'm in the process to receive a lens for my Beaulieu 6008 and I'd like to know if all C-Mount lenses have to be collimated or, in the case of lenses that are not actually screwed on but are equipped with a ring which "fastens" the lens to the body (llike the standard Schneider or the Angenieux 6-90 with LCU), such a process may be waived; in fact I suspect the different way the lens is attached to the camera makes it impossible to have microscopic variations in the rear element-to film plane distance which usually accounts for the need of collimation.

 

Or, is there a way to assess if a lens actually needs collimation? Possibly by shooting some feet of film? I guess with rather poor light so as to have the iris work at maximum aperture AND the focal length set at the widest. How does it sound?


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#2 Andries Molenaar

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Posted 08 October 2013 - 11:29 PM

Just shoot some film from a tripod. :)

Use wide aperture and focus on the ground-glass circle in the viewfinder. Do several shots and find objects nearby and at infinity with many sharp lines. Judge the film using a viewer or microscope.


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#3 Maurizio Di Cintio

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Posted 09 October 2013 - 11:34 AM

Thank you. I'l do like you suggested.


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