c mount lenses? at DVinfo.net

Andrew Todd · January 30th, 2006, 10:56 AM

i tried to search but cant find anything
would c mount lenses work allright.. i know they have c mount to fd adapters but what about the other way around?

c mount to fd adapter

http://cgi.ebay.com/NEW-C-MOUNT-to-C...QQcmdZViewItem

Jason Varner · February 1st, 2006, 11:46 PM

The flange depth is too short, 17.52mm. You can't get the rear element of the lens close enough to the ccd's without cannibalizing most cameras.

Andrew Todd · February 2nd, 2006, 09:35 AM

no... i mean the rear element onto ground glass

Jason Varner · February 2nd, 2006, 08:39 PM

C-mount lenses are primarily used in 16mm and cctv aplications. Meaning they at best will project a 12X16mm image onto a GG. Focusing on an image so small will magnify grain as well as causing additional light loss because you have to zoom in so far and most lenses are slower at long focal lengths. On the upside it can make for a much shorter adapter because the rear flange depth is so shallow. If you're into it, rock on, don't let me discourage you. Also CS mount lenses have an even shorter flange depth of 12.5mm so the distance to the GG is tiny by comparison to the larger 35mm adapters.

Andrew Todd · February 2nd, 2006, 09:11 PM

thanks jason

January 30th, 2006, 10:56 AM	#1
Andrew Todd Major Player Join Date: Oct 2005 Location: Saint John, CANADA Posts: 633	c mount lenses? i tried to search but cant find anything would c mount lenses work allright.. i know they have c mount to fd adapters but what about the other way around? c mount to fd adapter http://cgi.ebay.com/NEW-C-MOUNT-to-C...QQcmdZViewItem __________________ video : xl2 / letus35xl / bogen 503 photo- canon 1dmkII - bronica etrsi

February 2nd, 2006, 09:35 AM	#3
Andrew Todd Major Player Join Date: Oct 2005 Location: Saint John, CANADA Posts: 633	no... i mean the rear element onto ground glass __________________ video : xl2 / letus35xl / bogen 503 photo- canon 1dmkII - bronica etrsi

February 2nd, 2006, 09:11 PM	#5
Andrew Todd Major Player Join Date: Oct 2005 Location: Saint John, CANADA Posts: 633	thanks jason __________________ video : xl2 / letus35xl / bogen 503 photo- canon 1dmkII - bronica etrsi

February 1st, 2006, 11:46 PM	#2
Jason Varner Major Player Join Date: Aug 2005 Posts: 119	The flange depth is too short, 17.52mm. You can't get the rear element of the lens close enough to the ccd's without cannibalizing most cameras.

February 2nd, 2006, 08:39 PM	#4
Jason Varner Major Player Join Date: Aug 2005 Posts: 119	C-mount lenses are primarily used in 16mm and cctv aplications. Meaning they at best will project a 12X16mm image onto a GG. Focusing on an image so small will magnify grain as well as causing additional light loss because you have to zoom in so far and most lenses are slower at long focal lengths. On the upside it can make for a much shorter adapter because the rear flange depth is so shallow. If you're into it, rock on, don't let me discourage you. Also CS mount lenses have an even shorter flange depth of 12.5mm so the distance to the GG is tiny by comparison to the larger 35mm adapters.