Re: Horizon banding

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

On 24 Dec 98 at 13:15, Leong, Ka Tai wrote:

> After using my Horizon 202 for about a month, I have started to notice
> narrow bands across the film, right angled to the rotation of the lens.
> They show up when there is an even background of light grey (I shoot only
> B/W with this camera). I assume this is due to jerky ratation of the lens.
> 
> Is there any way to elimate this banding problem?

I have yet to come acrross 202 banding caused by rotational- or 
speed-irregularities (vertical that is, never seen any image 
'defects' oriented horizontally).
That said, there are still two/three[*] possible errors that can cause 
vertical artifacts: 

#1: More or less 'user error', when shooting right into the sun
(and thereby mistaking swing-lens flare for actual (mechanical
speed-related) banding).

#2: the shutter not closing on rewind/recocking. Does not have to 
appear with every intermediate shutter speed (I recall that the 
smaller slits showed a problem, while full open did not, and it can also vary 
with recocking in one full throw or with multiple short throws (latter 
being worse)).

#3: leaking felt trap on the sides of the drum. Only heard about this once 
with a 202. Appears to be easy to correct, by pushing the felt back 
in.

[*] there is a fourth one, but that one only applies to Kodak
Infrared HIE b&w film, and is not so much 202-related: 
Fogging of film caused by not loading (or developing!....~!@#$%^&*
shops!) in the dark....the effect 

Summary, in order of frequency/likelihood:

1) flare
2) shutter not closing on rewind 
3) felt trap not correctly assembled
4) daylight-loading of Kodak HIE

> Please reply to "102261.1743@xxxxxxxxxxxxxx". I do not check this mailbox
> everyday.

I have cc'd it this time, but please be aware that most people will 
ignore this line, and only reply to the list. IOW: don't count on 
this, better subscribe with a frequently used account.

PS: if your warranty is over, I can sell you a brand new 202 for
US$375....just in case you were thinking of forking out another
US$800 or so, not an uncommon price in the USA and elsewhere....;-))
I also fabricate a range of custom-color filters, like #21 orange, 
#25 red, #87 infrared and polarizer. A definate next project is a 
colored polarizer (a la 'vari-color' Cokin/Hoya)....took 
Blue/Yellow and Green/Orange with me skiing this year, and had a 
blast while using it with my EOS-gear (20mm required some tinkering 
with the filter holder)....very intense colored skies (and ski's....:-)), 
much much different than using plain color filters....eye-boggling! 


--                 
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'!]