RE: Horizon 202 horizontal banding........... and vertical

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

On 11 Jan 99 at 20:18, Jim DUNN wrote:

> I have come across horizonatally-oriented defects...
> 
> On my Horizon 202 with the new faster 1/500 of a second speed, there
> were horizontal "streaks" of slightly greater or lesser exposure across
> the entire image.  It could clearly be seen in the blue sky, and it
> occured at 1/500, and to a much lesser degree at 1/250 of a sec.  It
> could not be seen at 1/125 or /60 sec.
> 
> I was using slide film which is very exposure sensitive.  Also, it could
> not be seen on anything other than bright blue shy.
> 
> How did this happen?  The machining of the slit was so poor, with a loop
> you could see variations on the fixed side of the slit!!  On the Horizon
> 202 the slit is 6mm for 1/60, 3mm for 1/125, 1.5mm for 1/250 and 0.75mm
> for 1/500 exposures.  It does not take much variation on one of the
> surfaces to make an impact on a 0.75mm slit!
> 
> Suggestion for anyone testing a new panoramic camera -- take a picture
> of a deep blue sky and look for horizonal defects.
> 
> >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
> 
> 
> On the subject of banding on the horizon 202, I have just recently returned
> from a trip to Arizona and almost all my films shot on the 202 have banding.
> They have vertical bands of light and dark about 3 or 4mm in width across
> the total frame, on closer inspection I noticed that the frames also had
> horizontal bands of light and dark approximately 1.5 mm in depth running the
> height of the frame.

Try to eliminate a non-closing shutter on rewind/recocking as a 
possible cause....depending on where you point the camera while you 
transport film and recock the shutter, it could create something 
similar. Just open the back and look at the shutter while you recock.
 
> If anyone is interested I will post my findings to the list.

Sure do, and tell us whether the slit on your camera looks irregular 
too....
 
 

--                 
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'!]