Re: [APML] Black Negs a new developement

[Jerry Lodriguss <jml@astropix.com>]

If the whole roll was black, including the area of the film by the edge, 
past the sprocket holes, and including the unexposed portions of the roll 
where you did not take any pictures, then the entire roll was either 
exposed to light, or x-rayed or irradiated in the new security procedures 
for mail as Sean suggested. Did you buy this roll through the mail from 
Lumicon recently?

Irradiation through the mail would not have caused this problem with the 
first roll you shot because you said you bought it six months ago before 
all of this anthrax stuff started.

On the daytime shots you took, were they on the same roll as the black ones?

As previously mentioned by Kent, if the edges of the unexposed film are 
black, the film has been exposed to light. Possibly when loading the reel 
for development?

Don't laugh, well, ok, you can laugh, I once knew a professional 
photographer who raced back into the darkroom at the newspaper after a fire 
with what he called "absolutely great shots" and then proceeded to load the 
film on the reel with his eyes closed, as many do, but forgot to turn out 
the lights.

But again, if the daylight shots were on the same hypered roll, then that 
is not the cause.

So then we have a real mystery.

In any event, it is certainly not the developer. You could develop techpan 
in D-19 for 8 hours and it would not make the unexposed portion of the film 
black. 4 or 6 or 8 minutes development time would make no difference at all 
in this problem.


Jerry


At 10:15 AM 12/10/2001 -0600, you wrote:
>Hello Again,
>I seem to have no luck developing Lumicon hypered tech pan.  I took 4 more
>TP shots Saturday night, none came out.  I have not had any astro shots come
>out.  Four tries now and all sessions black negs.  I am thinking I should
>only be going 4-6 mins in d19?  I went 8 minutes on Saturday night and all
>black negs again.
>I took daytime shots used the same developer for 8 minutes and the shots
>came out.
>At first I kept trying to blame something else, but it must be the hypering
>developing combo ain't a workin.  These exposures Saturday were Halpha
>filter, Pentax SDUF II @f4, 35mm TP 30-60 minutes.
>Any tips?
>thank very much
>Brian

Astrophotography, Tips and Techniques
for Digital Enhancement in Photoshop:
http://www.astropix.com

--  APML Archives at <http://astro.umsystem.edu/apml/>  ---
             Unsubscribe at <majordomo@seds.org>