[Konvas] 250mm vs 135mm Jupiter lens test

[H. W. Stone]

 Slap your negative under the microscope at 200x or greater and actually check the sharpness when comparing "run at speed" footage and "off speed" footage.? More than once I have had to have the camera adjusted to shoot time lapse-- when the original footage was "that's dead on" but the adjusted footage became "that's {deleted} GREAT!"? 

Each camera may be slightly different than the one before or after, but if the speed is cut in half or doubled I feel it needs readjustment and checking.




 


 

-----Original Message-----
From: olivier satnet <firefly at uio.satnet.net>
To: Konvas Discussion List <cinema at konvas.org>
Sent: Thu, 25 Sep 2008 12:19 pm
Subject: Re: [Konvas] 250mm vs 135mm Jupiter lens test
















for me work perfectly at still frame 
!!!


If your theory is good ... 


?


what happend?switching ?KONVAS at 1FPS or 
one frame each 5 or 10 sec on time lapse shooting ?


versus the same konvas at 24fps !!! 


?


I have done boths , at Wide open and focus is FOCUS 
!!!film have a "right position" at many speeds ...


?


?


?


?


Of course, some thinks can only be done at running 
speed like "fixity", and registers tests ...or a 500fps camera is some kind 
different "physical" system than time lapse ...


?


my 3 "pesos"? contribution ...


?


Olivier . 


?


?


?


?


?



  
----- Original Message ----- 

  
From: 
  H. W. Stone 

  
To: cinema at konvas.org 

  
Sent: Thursday, September 25, 2008 10:49 
  AM

  
Subject: Re: [Konvas] 250mm vs 135mm 
  Jupiter lens test

  



  
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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