[Konvas] 250mm vs 135mm Jupiter lens test

[H. W. Stone]

 Part of the "cine focus and use" problem is that "still frames" do not match frames at 24fps.? The film is floating, comes to a rest, is snugged, exposed, and then floated again when you are running at speed.? This is the reason you test and check high speed cameras at the speed you will be shooting, and not just to some standard for everything.? 

On the Konvas and Arri II series the camera does NOT snug the frame-- in any camera with locking pins it does snug the frame, but even for an Arri II you should test focus distance and focus quality at 24fps, not at a lower speed or by stills.? 

There is a painful difference.


 


 

-----Original Message-----
From: olivier satnet <firefly at uio.satnet.net>
To: Konvas Discussion List <cinema at konvas.org>
Sent: Thu, 25 Sep 2008 11:18 am
Subject: Re: [Konvas] 250mm vs 135mm Jupiter lens test










first of all , I AM VERY INTERESTED IN DOING THE SMAE THING with my Pentacon
six teles
(120, 150,180,250 and 500mm !) wich adapter you use ?

Another way : I have used this to do tests for colimation of lenses !
with a 36 exposure slide film or negative , i have enought frames to can
calibrate 6 lenses , from
0 to +1,+2,+3,+4,+5 in milimeter scale on the lens focus barrel
and -1,-2,-3,-4,-5, ...

so with this system i konw if i am Less or More Flange on the lens
colimation ...

of course , the first test is calibration of Viewfinder ! ...

i have to do this because NO film lab in the counntry ... so a simple photo
one hour lab , and that,s is ...

The use of flash (studio flash, softbox, lightmetered of course !) ... give
me a SHARP exposure
i habe place a mark in the white know of the motor for "open" and "close"
Shutter ....
and i fire the flash with my Minolta lightmeter ....

IT is Soooo much efficient than filming at 8FPS !!!
 



 

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