[rollei_list] Re: Planar 2.8 coverage
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <rollei_list@xxxxxxxxxxxxx>
- Date: Tue, 2 Oct 2007 22:19:01 -0700
----- Original Message -----
From: "ERoustom" <eroustom@xxxxxxxxxxx>
To: <rollei_list@xxxxxxxxxxxxx>
Sent: Tuesday, October 02, 2007 6:31 PM
Subject: [rollei_list] Planar 2.8 coverage
Why are my Rolleiflex shots darker in the middle of the
frame, and lighter on the sides?
I've only noticed on this last roll, and only on shots
that have a lot of sky in them. Is it possible the lens
sends more light to the outside of the frame, could the
square lens hood be causing it - in most of the shots the
light sun is to my right? Or is it fogging in the process
of loading the film onto the reel for processing (I'm
pretty sure my room is light tight).
http://www.flickr.com/photos/99071700@N00/
Thanks,
Elias
---
This is pretty common when using tanks. There is more
agitation at the edges than the center. It seems to happen
with both inversion agitation and swirling agitation tanks.
The edges get developed more. One can investigate this by
sacrificing a roll of film. the entire roll should be given
a uniform light fogging outside of a camera and then
processed. If the image is darker at the sides it is pretty
good proof that its an agitation problem.
You can also try developing a roll the old fashioned
way by see-sawing it in a tray. This is uniform as far as
edge to edge development and should show whether the problem
is the camera or the development.
I use stainless steel tanks of the Nikor type and
generally use Kodak agitation, that is, five to six
inversions in five seconds repeated every 30 seconds. I have
also used the Ilford method of agitating for 10 seconds once
every minute. Both work and I have not experienced much
uneveness but there is always a little. I generally adjust
developer dilution to get development times of around 8 to
12 minutes.
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
---
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