C Mount Possibility?

[David Altizer]

Im considering moving from my 1DC to RAVEN in the next few months and am starting to build out my kit.

With the almost Super16 sensor size I have been wondering if it would be possible to mount C Mount lenses on the Camera. Even if I need to go into a " 3K or 2K crop mode" that would be fine.

I found an EF to C Mount adapter online and Im wondering if this would work. https://www.amazon.com/Fotodiox-Lens-Mount-Adapter-C-Mount/dp/B003EAY5S6

 

[Jacek Zakowicz]

You won't reach infinity with it. Other than for extreme close up macro with long lenses it is useless. In order to work it needs to go in about 20+mm- it would hit the olfp before then..

 

[David Altizer]

Thank you for your reply. I couldn't find the answer anywhere. Thanks! A real shame because you can get such fast wide angle primes in C Mount.

 

[Dan Kanes]

Zero guarantee of this working well at all... but this is kind of a whacked out solution if you wanted to experiment:

This adapter takes m42 lenses:

http://amzn.to/2BNZUHl

This adapter takes C Mount to an M42 thread:

https://m.ebay.com/itm/Camera-Adapt...m=321654320270&_trksid=p2385738.c100689.m4649

But your lens still may not recess enough into the cavity to reach infinity as Jacek said, and if you'renot careful you could accidentally donkey kick your OLPF or cover glass.

Still - fortune favors the bold if you like to experiment. For a production environment this would not be ideal.

Your real best bet is this lens, it’s freakin superb:

http://amzn.to/2C4GZna

And get one of these if you find you need the speed;

http://amzn.to/2EcLsGn

 

[Jacek Zakowicz]

This really is NOT a matter of luck. Simple math is enough to calculate. m42 45.46mm -c-mount 17.526mm = 27.934mm -this is how deep c-mount lens has to protrude inside m42 camera. This ring is obviously about 28mm off .
Dan you are in the lens business- you should know better than that ...;-)

 

[Dan Kanes]

Jacek -

starting with the canon mount - the M42 threads are actually recessed into the mount.

Next, you have the free-threaded C-m42 part which can recess into that mount...

so, in theory, your threads concentrically back into the mount space - think about Dante's Inferno - where the concentric rings get lower and lower.

IF (big if) your hypothetical C mount objective was thin enough around not to interfere with the threads as it becomes backed into the cone, you may be able to get an image - again - not ideal, but possible.

You could be backed way in there, making an image, but making your lens not easily operable.

Again, highly not advisable - but in theory relatively rather possible.

Looking more closely at the m42 to EF mount - you're better off with the Fotodiox type 1 - which would appear to not have a stopper on the threads - allowing you to back your M42-C adapter deeeeeeep in there. again - foolhardy but possible.

Save yourself the time and suffering and get a nice wide EF mount lens like the ones I linked to.

 

[Jacek Zakowicz]

Dan do you know how much is 28mm? these are nowhere near that. Not to mention the fact that RED is 21.5mm FFD so the lens would have to protrude 4mm (actually 7.25mm with the c-mount thread) into the camera body. It is really a pretty simple concept....

 

[Dan Kanes]

Dan do you know how much is 28mm? these are nowhere near that. Not to mention the fact that RED is 21.5mm FFD so the lens would have to protrude 4mm (actually 7.25mm with the c-mount thread) into the camera body. It is really a pretty simple concept....

Yeah, it's about 1.1 inches. hahaha.

What do you want me to say - YOU'RE RIGHT!?

You're right.

Have a nice day.

That's why I offered a good wide angle, inexpensive, native EF mount alternative as a suggestion, and which could in theory be driven by an Optitron Focus wheel using AF motors.

Byeeeeeeeeeeeeeeeeeeeeeeee

 

[Jacek Zakowicz]

Sorry if I came off too harsh. This is not about me being right- this is about math and physics being right. No amount of wishful thinking will change that. Some things are just black and white- and this is one of these things....