Re: 89B Behind shutter, any problems with that anyone??

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

On  8 May 97 at 14:56, Robert M Howells wrote:

> I've been using an 89B gel behind the shutter recently and noticed a
> few clear spots on my negs, these I assume are dust particles on the
> gel. I also assume that because the gel is very near the film plane
> the dust, as well as the image, is focused on the film. Anyone else
> had these problems and are there any solutions with regard to the
> behind the shutter method.

I have been using a #87C polyester foil (0.4mm, thicker & more rugged 
than most 'gels') for over a dozen rolls now, and I have yet to see 
the first dust problem on film. This is with less-than-perfect 
film changing condition during holidays (both darkload bag & in a 
storage closet). Checked the inside of the camera as often as I 
could, but it stays remarkably clean of dust, fingerprints and 
scratches. I sacrificed one of my EOS-1's for this solely 
purpose....:-))
Btw: do you notice any bulging/bubbling of your gelatine filter?
Apart from the vulnerable mechanical quality of gelatine I would be 
worried about reactions to humidity differences. The latter would 
definately happen inside a darkload bag....can get a pretty awful 
sweaty experience on warm days (even happens to me frequently while 
film changing on a ski slope in midst of winter....8-))

Btw, one of my last rolls of HIE was finished with a set of indoor 
portrait flashes, both with #87C inside the camera and mounted on the 
flash. Although I put the camera on manual, and forced the TTL flash to 
bracket by adjusting ISO between 25 and 800 ASA, all neg's showed the 
same (good!) density. I need another test session with the flash also on full 
manual setting (I can then bracket in 1/1 to 1/16th capacity), but I 
am a bit dazzled which of the auto-thingies screwed up here....I 
think the BTFR filter in the camera somehow fooled the flash sensor 
(it measures reflection bouncing of the film inside the camera).


- -- 
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'!]
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