[Konvas] 250mm vs 135mm Jupiter lens test

[olivier satnet]

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 !!!


----- Original Message ----- 
From: "olivier satnet" <firefly at uio.satnet.net>
To: "Konvas Discussion List" <cinema at konvas.org>
Sent: Wednesday, September 24, 2008 11:13 PM
Subject: Re: [Konvas] 250mm vs 135mm Jupiter lens test


> HI ADAM .... to test lenses , i have a best idea i have used many times
with
> my konvas ...
>
> i do Open flash during night ... i use the knob to Open and close the
> shutter ....
> I use studios flash ... so i can expose one single frame ....
> Open shutter , fire the flash ---and turn to the next frame, place the
lens
> cap ....
> etc , etc untill i expose full 36 exposure ...
>
> I generally do tests at wide open , at 5,6 and 11 ....
>
> Bests, Olivier .
> ----- Original Message ----- 
> From: "Adam Frey" <thefirstrule at chainsawlinux.com>
> To: "Konvas Discussion List" <cinema at konvas.org>
> Sent: Wednesday, September 24, 2008 3:26 PM
> Subject: [Konvas] 250mm vs 135mm Jupiter lens test
>
>
> > I did a small test this morning, just to see if it would work, and it
> > kinda did. I decided to try and shoot some FUJIFILM 400 Superia X-tra
> > 135 film (still 35mm film) thru my Konvas. The test was to compare the
> > Jupiter 250mm Pentacon Six lens with the Jupiter 135mm OCT18 lens.
> >
> > Check them out here:
> > http://adamfrey.com/images/lenses/konvas-1m-135mm-lens.jp2
> > http://adamfrey.com/images/lenses/konvas-1m-250mm-lens.jp2
> >
> > They both look pretty good, don't you think? The test was inside my
> > son's new "house" that he got for his birthday. It was sitting in the
> > shade, and I thought it was the perfect place to test. So I put the
> > light-meter inside the little house, with a few objects behind it for
> > lighting/color contrasts and grass/dirt between the boards on the
> > fence. I only popped the meter where it sat (this wasn't a film test,
> > but now I wished I'd have done it to see what kinda latitude the film
> > has). It popped at f11.4, so I set the lenses halfway between f11 and
> > f16. Anyway, here's two pictures ripped from the negs. I scanned them
> > in at 24-bit, 1200x1200dpi and imported the to LiveQuartz 1.8.1, where
> > I got them down to a size that was more manageable, and was able to at
> > least stay in 16-bit. These are JPEG-2000 images (thus ending in .jp2)
> >
> > For those that can't read JPEG-2000 or they are too large for you to
> > download, after export, I loaded the pics into the GIMP and re-
> > exported them as 86% JPEGs (Jpegs are 8-bit ONLY). Every effort was
> > made to keep the images as close to their original look as possible,
> > while trying to cut them down to a manageable size. And here they are:
> > http://adamfrey.com/images/lenses/konvas-1m-135mm-lens-test.jpg
> > http://adamfrey.com/images/lenses/konvas-1m-250mm-lens-test.jpg
> >
> > Note that these pics weren't doctored in anyway other than resizing -
> > and I kinda had an issue with getting the *exact* exposure, since the
> > Konvas hiccuped a few times at 8fps (Like an idiot, I did this on it's
> > first run and it was a cold morning), and, well, I only had a foot or
> > so of raw film to play with (it was a 135 roll of 24 exposures, which
> > meant I'd get 48 exposures - but, of course, you have to burn a good
> > many frames just to load the film). Anyway, I chose the frames that I
> > thought represented the proper exposures...
> >
> >
> > Enjoy,
> >
> > Adam Frey
> > Director/Cinematographer
> > Crimson Chain Productions
> > http://crimsonchain.com
> >
> >
> >
> >
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>
>
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