Differing C-Mount flanges?

[mr_x]

Hi,

Have a 1958 Bolex H-16. I bought several tv/video c-mount lenses for this camera. I was lucky, they all fit. Recently though I came by a c-mount lens with an extended rear flange, which fits the screw socket but cannot focus because of the extra flange length - about 1/4 to 1/8 inch. Is there any way of spotting the 'wrong' c-mount for a Bolex, other than by scrutinising the rear element flange please? A lot of the time that end of the lens is not pictured on the net, or a rear lens cap obscures the all-important thread there.

Thanks

[bolextech]

To fit the turret on a 1958 Bolex, the thread on the lens must extend no further than 4mm deep.
The older Bolex turrets from the 40s and early 50s had thicker turrets and could take a deeper thread, around 8mm deep.
The H16M cameras also have a very deep mount, in excess of 8mm deep.

Jean-Louis

[mr_x]

Thanks, it's a pig-in-a-poke unless you can see the rear element before you purchase a lens

[nikonr10]

Thanks, it's a pig-in-a-poke unless you can see the rear element before you purchase a lens

Hello Mr X ,
Yea had the same kind of thing, when looking for a prime lens for my anamoprhic baby isco lens for my Beaulieu 4008 , like on ebay ? still looking gave up for now ?
found need to go too a lens dealer so can play around and find the right c mount lens to work with my anamoprhic lens pay more but then you get it right .
Thing on ebay sometime's it really not easy to tell as there is some differents in c mount lens on rear which photos make it hard to see or tell ? then on bolex you have rx mounts then tv lens can have a long rear which is also called c mount ,

Then the digital people also sent price's of old lens cazy higher also makeing it harder to find with alot not knowing how to look after these hand made gems etc ,
The age's when all lens fit most dig bodys with the right mounts ?

[bolextech]

By the way, concerning the Beaulieu 4008, the C-mount cavity is a bit less than 4mm before hitting bottom. About 3.8mm.
A lens with an exact 4mm deep thread would hit bottom before being completely seated.

Jean-Louis

[mr_x]

It's tough. Got a super Pan Cinor 85 (17mm-85mm f/2) c mount lens now but there are situations where I need other lenses. Was very lucky to pick up some okay 'tv' lenses which fit, a 12.5mm and a 35mm but I'm always on the lookout. Anamorphic lenses interest me but I will never convert to widescreen, I much prefer 3:4 format, I've even stock piled 3:4 computer monitors because the 16:9 widescreens drive me nuts! ;)

[nikonr10]

It's tough. Got a super Pan Cinor 85 (17mm-85mm f/2) c mount lens now but there are situations where I need other lenses. Was very lucky to pick up some okay 'tv' lenses which fit, a 12.5mm and a 35mm but I'm always on the lookout. Anamorphic lenses interest me but I will never convert to widescreen, I much prefer 3:4 format, I've even stock piled 3:4 computer monitors because the 16:9 widescreens drive me nuts! ;)

Mr x ,
I found over the year one needs go away from what one knows or think he knows or what man on iphone or tv man says facebook etc , as it becomes so little what we do know ? or what lordGoogle tells me, so puting this into my filmmaking and Anamorphic filmmakeing ?when you can get it right can really blow you away only thing< its look very strange to them people that are watching you on cctv ,
That why am looking for the right wide c mount prime for my baby isco so it's more pocket size on my beaulieu 4008 , mind you have got it to work really good on my leicina speical only thing it works from 35mm and up on a prime .

Also finding super 8 film making very constrian at times , film being what it is or price of it now still works out to be cheaper with home diy cooking , would love to go super 16 but that adream for now . maybe look for a Arri sb .

[mr_x]

have an anamorphic lens, started filming it with a Super 8 camera which suddenly & inexplicably stopped working in the middle of the project. Now use clockwork cameras which are more reliable, and more challenging - since you need to get your pans in before the spring winds down! Would love to do a widescreen short but it is way down on my list. I consider 4:3 a standard format at the end of the day, but different strokes for different folks as Joan Jett (Joan Marie Larkin) once sang ;)

[nikonr10]

have an anamorphic lens, started filming it with a Super 8 camera which suddenly & inexplicably stopped working in the middle of the project. Now use clockwork cameras which are more reliable, and more challenging - since you need to get your pans in before the spring winds down! Would love to do a widescreen short but it is way down on my list. I consider 4:3 a standard format at the end of the day, but different strokes for different folks as Joan Jett (Joan Marie Larkin) once sang ;)

There alot of people who have different strokes out there ? as Lord Google knows , what I like about filmmaking is pushing what I don.t know /so give me something new to learn, and even master if I can , with what cameras and lens I have , some time you just need that one lens you do not have to make it work on a string ,the only thing is that lens you need , a rare thing to find < and can come at a price or two , then fitting the whole rig can be a real pain ,
Anamorphic is one part of filmmaking , when you have nature around with space and dept to work with it "can really comes out to play " and colours can really pop with 100d on a sunny day .

Anyway we can always go back and look at the master Sergio Leone ,

[mr_x]

thanks, someone lookin' fer a widescreen round here?



;)