Re: Mamiya 645/w135 back vs. HIE

[Nate <nkeith@xxxxxxxxxxxxxxxxxxxxxx>]

Good point - I guess I made the mistake of not considering that since of all
the rolls of HIE I've done, this is the first instance of this problem.  It is
probably just a coincidence that the roll was my test spool through the new
back (and the first one I did in a non 35mm SLR)  Maybe my agitation was a
little over zealous that day.

It makes more sense that this could be the problem.  If it is, I feel more
comfortable with shooting HIE in the Mamiya.  I will test it out.

Thanks,

Nate

Elton N. Kaufmann - Cycloid Fathom Group wrote:

> Nate:
> A short time back I complained about a similar pattern of fogging and the
> list quickly enlightened me.  (By the way, thanks to those on the list who
> helped - I've been quite negligent about letting the list know what
> valuable advice I've found here.)  It's most likely not the camera at all,
> but the agitation during processing that generates excessive turbulence
> (i.e., more agitation than the average) at the sprocket holes because those
> holes disturb the liquid flow in the area.  I reduced my agitation to one
> gentle inversion plus one 360 degree slow roll of my Patterson tank per
> minute (currently using Xtol 1:1 or D-76) and the problem was greatly
> reduced.  I too saw it primarily at the top of the frames (noticed most
> easily due to the otherwise clear skies in the scenes).
>                         Good Luck
>                                         EltonK
>
> >Date: Sat, 30 May 1998 09:13:22 -0500
> >From: Nate <nkeith@xxxxxxxxxxxxxxxxxxxxxx>
> >Subject: Mamiya 645/w135 back vs. HIE
> >
> >A short time ago there was a thread regarding ir light leaking through a
> >Bronica back.  I do not recall the specific symptoms or details, but I
> >suspect I am having a similar problem and would like to confirm this.
> >My apologies for rehashing this previous topic:
> >
> >On a recently developed roll of HIE, I noticed that some of the images
> >have what appear to vertical fog patches extending from the sprocket
> >holes.  It is more noticible from the top down than the bottom up, and
> >with those negatives that are more dense.  I have not noticed any
> >fogging from the horizontal sides.  There is no apparent fogging when
> >using Tri-X 400 in 35mm format.
> >
> >My suspicion is that IR light is leaking through the top and bottom if
> >the back/body line and the patches are created extending from the
> >sprocket holes since the holes are less of a medium for the light to
> >travel through.
> >
> >Any thoughts, and what was the solution in the other instance, i.e.,
> >what type of not IR transmitting cloth/cover could be used, etc.
> >
> >Thanks,
> >
> >Nate
> >
> >
> >- --
> >Nate Keith
> >Eden Prairie, MN
> >USA
> >
> >Visit NatelanD ImageS at http://www.pioneerplanet.infi.net/~nkeith
>
> Exhibiting fine-art and editorial photography
> Cycloid Fathom Gallery
> Elton N. Kaufmann, Chairman
> P. O. Box 8129
> Downers Grove, Illinois 60517-8129
> USA
> cycloid@xxxxxxxxxxxxxxxxxx
> http://www.cycloid-fathom.com/gallery/
> ftp.cycloid-fathom.com/group/uploads/
>
> *
> ****
> *******
> ******************************************************
> *  To remove yourself from this list, send:          *
> *         UNSUBSCRIBE INFRARED                       *
> *       to                                           *
> *         MAJORDOMO@xxxxx                            *
> *----------------------------------------------------*
> *   For the IR-FAQ, IR-Gallery and heaps of links:   *
> *  http://www.a1.nl/phomepag/markerink/mainpage.htm  *
> ******************************************************



- --
Nate Keith
Eden Prairie, MN
USA

Visit NatelanD ImageS at http://www.pioneerplanet.infi.net/~nkeith


*
****
*******
******************************************************
*  To remove yourself from this list, send:          *
*         UNSUBSCRIBE INFRARED                       *
*       to                                           *
*         MAJORDOMO@xxxxx                            *
*----------------------------------------------------*
*   For the IR-FAQ, IR-Gallery and heaps of links:   *
*  http://www.a1.nl/phomepag/markerink/mainpage.htm  *
******************************************************

------------------------------

End of Infrared-Digest V0 #593
******************************