Different lens front Diameter... Matte Box homemade Donut ? or ?

V

vincent thomas

Well-known member
All right, first, im someone who is more confortable in doing image and writting then being a camera technical guru. So please be indulgent of my lack of experience here.

I about to buy a matte box, a tanguerinebright viv and at the moment, i don't own a full set of cinelens with a unified front diameter liek the zeiss cp2 .
in order to save money i was advised to build a home made donut neoprene rings to adapt my different lens (Contax zeiss 21mm, 85mm, Leica Summilux , hasselblad CFI and...)

Any suggestion where i could find one already made which could fit the tanguerine mattebox (rear housing is 150mm) ?
Or what about trying to unified the front diameter of my actual lens to a certain diameter and buy a 150-114mm clamp on rings for example?

Is there any online database which could list of the front diameter of all the lens? I found difficult actually to get this kind of information...
Are the rokinon cine lens unified? If yes, in which diameter?

Thanks for all

vince*
__________________________________________________________
Vincent Thomas
VFX Supervisor / Lead Artist / Director & Cinematographer
http://fr.linkedin.com/in/vincentthomas
http://www.stranger-than-paradise.book.fr/
 
Best way would be to install same size hard fronts on all the lenses. The inexpensive way would be to purchase step rings off eBay. I have my matte box setup with an 80mm insert. The step rings installed on my lenses was 77mm with an 80mm exterior diameter, allowing the use of 77mm screw-in filters if needed. I can install larger diameter inserts in my matte box if needed, or remove the rear donut assembly if needed to accommodate large lenses like my Cooke 20-100mm zoom.
 
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