[Konvas] 250mm vs 135mm Jupiter lens test

[olivier satnet]

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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