[Konvas] camera frame by frame .... Olivier .

Sean McVeigh konvas at smallpony.ca
Wed Dec 10 14:59:29 CST 2008 

oh, and one other thing.. I fiddled with motor control on my Arri 2C 
once.  It seems that the consensus when it comes to time-lapse work on 
those cameras is that you really need a capping shutter of some sort.  
There is apparently enough light bounce around the shutter cavity that 
it will leak light slowly and start exposing your frame.  Some sort of 
mechanical shutter in front of the lens may be required to block out all 
light.
Cheers,
Sean

Sean McVeigh wrote:
> Hadn't thought about doing it that way before!
> The only thing that would concern me about such a solenoid would be 
> consistent exposure.. you'd have to find one with spot-on 
> repeatability.  A servo motor of some kind might do the trick for you 
> and give you slightly more control over the revolution speed.  Stepper 
> plus a chopper for feedback?
>
> Cheers,
> Sean
>
> H. W. Stone wrote:
>> About ten years ago I had a "time lapse staging solenoid" drive for 
>> the Arri 2b/2c camera, and it worked like a charm, but would be 
>> cheaper to build than to buy.
>>
>> Get an Arri or Panavision brand "flat base adapter" for the camera.  
>> That's made to put the camera motor beside the camera, not under it-- 
>> but then, instead of an Arri motor get an off the shelf "staging 
>> solenoid" used on sorting conveyor belts, and set it up to pull a 
>> ratcheted drive cog mounted where the motor would normally go.  This 
>> means you can program the staging solenoid to trip at given 
>> intervals, anywhere from twenty or so times a second down to once a 
>> month.  The difference is that when it fires it fires fast, and you 
>> get a properly exposed, advanced, and handled frame.
>>
>> If you do get a motor from Clive, it will work, but staging solenoids 
>> are interval set items, the motors are not.
>>
>>
>>
>>
>> -----Original Message-----
>> From: olivier satnet <firefly at uio.satnet.net>
>> To: Konvas Discussion List <cinema at konvas.org>
>> Sent: Wed, 10 Dec 2008 2:00 pm
>> Subject: [Konvas] camera frame by frame .... Olivier .
>>
>> HI guys, for this moment , i own a Arri2C full overhaulhed with a 
>> 24FPS motor (24fps syncro only) and PL mount ...
>> i will receive my 1000 feet magazine for Arri2/Arri3 ....
>> so i will have completed my system with own equipment for tape to 
>> film ....and mount all in a metalic structure with marks for
>> 1:85, 16/9, and scope transfer
>>  
>> BUT, i am really interested in a 3 to 4 FPS transfer from stills ... 
>> (animation or frame by frame transfer ...) OK it take more time but 
>> will make another option to tranfer video to film for my customers )
>>  
>> SO i need info about a TOBIN motor for low speeds ... frame by frame 
>> 1 fps 2fps 3 fps .... (like the timelapse ones ...) to mount it on my 
>> Arri2C
>> I need so a Inverse Baseplate to plate the motor in a side of the 
>> camera and NOT below ... for more stability ...
>>  
>> so any Timelapser have info wich motor TOBIN or other will be good 
>> for this system ???
>>  
>> Bests, Olivier .
>>
>>     ----- Original Message -----
>>     *From:* Speedbirdmgh at aol.com <mailto:Speedbirdmgh at aol.com>
>>     *To:* cinema at konvas.org <mailto:cinema at konvas.org>
>>     *Sent:* Tuesday, December 09, 2008 7:23 AM
>>     *Subject:* Re: [Konvas] funny mount
>>
>>     "Thee´s a nice zoom lens on EBay these days… Do you know the funny
>>     kind of lens mount? Item 220323145688"
>>          Ole,
>>          Yes, that looks like a 16mm "C" mount to me. but there seems 
>> to be
>>     a sealing ring missing over the rear element, should'nt affect the
>>     image though.
>>          I have one identical to above but with Arri standard mount. 
>> Mine
>>     has "minty" glass and has been serviced.
>>     Euros 200.00 to you!
>>          These are nice lenses if you can get a good one. The 35mm 
>> version
>>     is stunning.
>>          Rita   (got Uher spares if you need any)
>>                    
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> _______________________________________________
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> http://konvas.org - All about Konvas, Kinor and other Russian Cinema 
> Cameras
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