[rollei_list] Re: Henry Schering & Z-I Super Ikonta B film advance
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <rollei_list@xxxxxxxxxxxxx>
- Date: Mon, 13 Apr 2009 15:24:37 -0700
----- Original Message -----
From: Choiliefan@xxxxxxx
To: rollei_list@xxxxxxxxxxxxx
Sent: Sunday, April 12, 2009 5:47 PM
Subject: [rollei_list] Re: Henry Schering & Z-I Super Ikonta
B film advance
One article with pictures of the Super Ikonta B advance is
at:
http://www.davidrichert.com/rebuilding_the_super_ikonta.htm
Health, Peace
Lance
Selma, NC 27576
This is interesting because it shows the spacing is
fixed by the notches in a wheel. The spacing would be
affected by the thickness of the film wound up on the
take-up spool. Now, the question is whether there really is
enough difference between film and backing paper made at the
time the camera was made and now to account for spacing
problems. My guess is that there is not. Note that the
maximum diameter must be less than the flanges on the spool
in order to be light tight. So, one can get some idea of
relative diameters by the amount of excess diameter at the
spool flange. It seems to me that I never see much. Also
note that the error would be progressive, i.e., the spacing
would start out about right and become narrower toward the
last frames.
A similar system is used on the Graflex and Calumet
roll film adaptors for sheet film cameras. While these were
made in the late 1940s until the 1960s (for Graflex) and
until pretty recently for Calumet and, presumably, were made
for "modern" film, the spacing on both (I have both types)
is quite uniform.
I don't have much information on roll film standards
but I think they have not varied much since the 1930s or
even earlier. Roll film has been with us for over a century
so I think it stabilized in dimensions quite a long time
ago.
No definite ideas as to why some Ikontas don't wind
evenly but wear and dirt seem possibilities.
I would still like to know the difference between the B
and BX models. Perhaps just another notch on the metering
wheel but perhaps the mechanism is different in some other
way.
--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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