Re: [APML] TP for terrestrial work

[Jerry Lodriguss <jml@astropix.com>]

>I've been trying to use Technical Pan in a Pentax 67II camera
>on terrestrial subjects to get the kinks out of the process
>before moving into celestrial work.  I had come to the conclusion
>that TP is strange stuff and wouldn't work as a normal B&W film
>unhypered until I saw Mt. Leroi's stunning moon picture.  What
>I am seeing is parts of the image are either way over exposed
>or way under exposed, there is no in between.  It's like the
>middle range of the contrast has been nulled out.



That is because you are using an extremely high contrast developer with an 
extremely long development time for a normal scene, sunlight on the earth.

D-19 and 8-10 minutes are for extremely low contrast deep-sky objects, not 
normal daytime terrestrial photography.

For daylight subjects, try Technidol.

You have to match the subject contrast range to the developer and dev time.

Jerry






Astronomical photography: http://www.astropix.com



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