Modify CS mount to C-Mount?

[Justin Lovell]

is this possible, has anyone done it?

Would like to use the CSMOUNT lens on my beaulieu.

[dirb9]

You might be able to adjust the focus of the lens to fit C mount's longer register. On some lenses, the focus ring can be detached from the helical by a screw, and you could try alternatly loosening the screw, moving the focus ring, tirghtening it again, and turning the focus ring until the image is in focus in the viewfinder. The worst that will happen will be that the lens will run off the end of it's helical before the image is in focus, or the helical simply won't be long enough to accomidate the required focus change.

[sciolist]

A CS-mount lens has a flange focus that's 5mm shorter than a C-mount lens and so must be 5mm closer to the film plane. I think you'll only need to examine the camera to see that this isn't feasible (the guillotine shutter is in the way, for one thing). It's possible to fit C-mount lenses to a CS-mount camera by adding a 5mm spacer, but CS-mount lenses cannot be made to fit a C-mount camera.

Unless you use a wide-angle conversion lens (like Century's 'death lens' or the Schneider ultrawide III), the only way to go wider than 6mm with a Beaulieu of which I'm aware is to pay big money for a Century 3.5mm or Century 1.9mm prime lens. These lenses are made for 16mm cameras but can be adapted to Beaulieu 4008 series cameras. Du-All in NYC offer a Beaulieu Super 8 rental package that includes the 1.9mm.

Back in the 1980s, Century offered 2.5mm and 3.5mm lenses for Super 8, but I've yet to find either secondhand. I've spoken with a representative of Schneider-Century at their Van Nuys office, learning that they've got the front components of the 2.5mm lens still in inventory, but not the rear. Maybe if there's a groundswell of interest in these super wide lenses (not really all that wide when compared with 35mm still camera lenses), Schneider could be persuaded to offer them again, but they won't come cheaply. I'm guessing the 2.5mm lens would probably cost about $1.5K (it was $595.00 in the early 1980s).

[Lunar07]

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Unless you use a wide-angle conversion lens (like Century's 'death lens' or the Schneider ultrawide III), the only way to go wider than 6mm with a Beaulieu of which I'm aware is to pay big money for a Century 3.5mm or Century 1.9mm prime lens.
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In addition to what you say, a good way is to use the Schneider Kreuznach C-mount 10mm Cinegon made for the 1"CCD (the 55mm front thread variety) or the one made for the 3/4" CCD (the 32mm front thread variety) along with the 0.5x wide angle attachment made by Schneider Kreuznach (Type I with dual 55mm, 62mm mount thread).
Note that the Cinegon 1" CCD lens also covers S16 frame in addition to S8. So, it is a good combination to have around.

[sciolist]

The 10mm Cinegon w/Schneider 0.5x accessory may be a good choice for 16mm and Super16, but with only a 1mm advantage over the 6-66mm and 6-70mm lenses with which the Beaulieu 4008 ZM II and 4008 ZM4 cameras are usually equipped, it doesn't seem worth the expense. Simply using a Schneider Ultrawide III converter gives 4mm with those lenses, so why would one need a Cinegon 10mm?

In my view, the format needs C-mount prime lenses in the 2.0mm to 3.0mm range. Fitting the Century 0.3x converter (http://www.schneideroptics.com/g/deathl ... HgodzhQ3hw) to the 6-66mm or 6-70mm lenses would theoretically deliver a field of view equivalent to a 2.0mm prime lens, but I've not tried this combination and don't know if it would work.

[aj]

Maybe these are interesting for Super-8 usage too?

A 20mm lens is easy to get and gives plenty of wide-angle. Would these modern kit-lenses 17-35mm be usable too?

http://www.guerilla35.com
http://www.redrockmicro.com/

[sciolist]

Maybe these are interesting for Super-8 usage too?

A 20mm lens is easy to get and gives plenty of wide-angle. Would these modern kit-lenses 17-35mm be usable too?

http://www.guerilla35.com
http://www.redrockmicro.com/

Focal lengths longer than about 8mm aren't wide angle lenses for Super 8. The 17-35mm and 20mm lenses you name are wide angle for 35mm cameras, not for Super 8. Maybe you missed the decimal points in my post?

[aj]

The links point to suppliers of apparati which use 35mm still camera lenses to project images on very fine ground glasses. These glasses are then filmed from the rear...
Gives excellent control over depth of focus and focal angle. One might even use fish-eye etc.

Much intended for video camera and digital camera which have little facilities and hard to get DOF control due to coarse pixels and short focal lengths.

All posted and discussed before. Like the eternal desire for a wide-angle.
All understood quite well.

[sciolist]

Another ultra wide angle lens that might be suitable for the Beaulieu is the 1.98mm f/1.9 Super Tegea made by Kinoptik. Its bulk would require a rod support system and, like the Schneider-Century lenses, it's expensive (Igor's Camera Exchange has a used example in mint- condition offered at $1,795.00).