Re: Horizon 202 camera

[Willem-Jan Markerink <w.j.markerink@xxxxx>]

On 23 Aug 99 at 16:01, Marco Pauck wrote:

> Willem-Jan Markerink wrote:
> > > There is probably an additional source for this problem. Just take a
> > > look at the sample image in the 'Tips' section of
> > >
> > > http://www.pauck.de/marco/photo/panorama/horizon202/horizon202.html
> > >
> > > I suspect the shiny inside of the back door for this effect. Some
> > > deep-black paint will help in this case as well.
> > 
> > Light never goes through the emulsion, with exception of Kodak HIE
> > infrared (and a few other thin semi-aerials without an anti-halation
> > layer).
> 
> Your right. New theory below ... ;-)
> 
> > > I'll try to verify this theory as soon as I'll get a Horizon that
> > > outlives its six month warranty without any problems. Right now,
> > > I'm waiting for my third one as the first two had problems with light
> > > leaks and transport. From the feedback I got from other users, light
> > > leaks at the seals of the lens drum seem to be a *major* problem.
> > 
> > Are you sure the shutter did not stay open during recocking?
> 
> Absolutely.

Sometimes it can only be provoked by recocking in partial strokes of 
the lever....while a single-stroke action is fine.
 
> When you take a detailed look at
> http://www.pauck.de/marco/photo/panorama/horizon202/horizon202_banding0.jpg
> you'll notice that:
> 
> 1. The artefact in frame 23/24 includes distorted but sharp images
>    of sprocket holes (at the top on the right side of "TMX" and at
>    the bottom)!
> 
> 2. The artefact on the right of frame 25 is similary distorted (its
>    left border is strongly curved). It was casted by the sun in
>    frame 26!

Well, if direct sunlight is at the very corner of an image, even with 
a normal SLR it will 'bleed' into the next image....
 
> Also note that the sprocket holes show up as *dark* in this postive.
> Therefore, I suppose that the film inside the image area reflects
> the light of the point-like light source sun onto the film going onto
> the take-up spool (considering that the film is upside-down in the
> camera and going from right to left).
> 
> Any clues?

The back door has a 'blind' that nearly covers the frame rails from 
left to right, so I can't see how light can go through directly, 
hitting the already exposed film....
Again, it would have to go through the emulsion, and IMO that is 
unlikely with anti-halo films.

--                 
Bye,

Willem-Jan Markerink


      The desire to understand 
is sometimes far less intelligent than
     the inability to understand


<w.j.markerink@xxxxx>
[note: 'a-one' & 'en-el'!]