Adding a video tap
Posted 20 July 2005 - 06:34 PM
The current method that I'm pursuing is replacing a prism with a two-way mirror in order to split the light. It seems to be working so far except for one thing, focus. If I focus on an object, then pull the prism and insert the two-way mirror, I can't seem to get the picture back in focus. I adjust the mirror in, out, check both sides and it's still soft. Just to clarify, it's affecting the focus to the viewfinder, not to the film plane.
Does anyone have any ideas? I hope you enjoy my picture at the least.
Posted 20 July 2005 - 08:57 PM
Posted 20 July 2005 - 11:12 PM
That means that if you replace the prism for a mirror, you should take the eyepiece lens further away from it to get focus, but this might introduce other things like vignetting.
The best way is to get a prism which has on one side a 50% reflective layer and the videocamera could look through that......
Otherwise, go for full 100% video assist and operate on a LCDscreen and trust your focus puller....
Posted 21 July 2005 - 09:46 AM
Posted 26 October 2005 - 01:07 PM
This seems like a wonderfull camera. I was thinking of buying an Arri 2C then discovered this camera.
Even though I have never seen the camera I seems to have a lot of ADVANTAGES:
*Variable Shutter on most models? (10-200 degree or 15 -200 ??)
*Possible PL mount upgrade
*Apparently the mechanics of this Camera are much more durable,sofisticated and less prompt to have problems with it than the Arri 2b or 2c
*Less expensive than Arri 2c
* Some Models will shoot 16mm AS WELL! but someone told me It's really made to shoot with 35mm and shooting with 16MM could be risky (comments on this???)
* possible S35 and S16 modifications
But it also seems to have disadvantages:
* NO VIDEO ASSIST POSSIBLE
DOES ANYBODY KNOW IF IT IS EASY TO RIG SOME SORT OF VIDEO ASSIST WITH LCD SCREEN THAT CAN BE QUICKLY REMOVED SO YOU CAN ALTERNATE QUICKLY FROM OPERATING WITH THE LCD TO THE EYEPIECE ????
* Not a lot of people know about the cameflex CM3 so it seems it would be risky to buy one because it would be hard to find someone for maintenance / repairs and PARTS..
ANY THOUGHTS OR LINKS ON THE CAMEFLEX CM3 WILL BE VERY MUCH APPRECIATED!
Posted 27 October 2005 - 09:00 PM
Edited by Christopher D. Keth, 27 October 2005 - 09:06 PM.
Posted 30 October 2005 - 07:13 PM
I drew a very fast illustration (literally about 20 seconds, so excuse the shotty quality and inaccuracy of the reflection and refraction angles ) of how the prism bounces light. It uses internal reflections to bounce light, so if it's built like my picture, the light would travel a longer path, as well a possibly being altered further by the prism's surfaces.
I thought a prism worked like this.
Posted 22 November 2005 - 08:23 AM
Posted 22 November 2005 - 11:08 AM
I thought a prism worked like this.
i think it does.... but if you are looking at a subject 10 feet away, doesnt it now look 20feet away after going thru the prism just as if you were experiencing the same illusion by looking into a mirror??
Posted 06 December 2005 - 10:00 PM
exchanging a mirror for a prism does basically the same but it there are some issues, like the refraction index of the glass and such, but it has been so long ago that I learned about this....
But you can find yourself a 50% transparent silvered mirror and replace the original with that. You need to make a construction that keeps the light out, also the picture is reversed because it is not mirrorred by the mirror (it goes straight through). Some tiny CCD camera´s have a switch to reverse scan.
Posted 08 December 2005 - 06:16 AM
What about mounting the DV cam at the eyepeice? I'm considering this for an XL2 on my Arri IIb. I'll have to see what the eyepeice optics project on a white card in a dark room. If it will render an image 1/3", it may be do-able.