Adjustments for Long Exposures

[Erik Hartmann]

I am testing my 'new' 13x18 pinhole camera......Hole 0.4 mm f=100 mm
Out in a nearby park I shot 6 films (Fomapan 100 iso)..... Sunny Day with lots of shadows .....after developing almost nothing on the film.......
I think I did not made any adjustments for Long Exposures.......

and where can I find something about reciprocity factors.......

 

[Tom A]

I am testing my 'new' 13x18 pinhole camera......Hole 0.4 mm f=100 mm
Out in a nearby park I shot 6 films (Fomapan 100 iso)..... Sunny Day with lots of shadows .....after developing almost nothing on the film.......
I think I did not made any adjustments for Long Exposures.......

and where can I find something about reciprocity factors.......

Hej Erik

You can find info about Fomapann 100 and reciprocity factors in the datasheets, here...
Fomapan 100.pdf

Based on my limited experience with Fomapan 100 and low ligth photography I would say it is a pretty awful film for low ligth photography, or pin-hole in your case. It gave me consistent underexposed negs.

Good luck with it

Tom

 

[Pinholemaster]

I also find using a Black Cat Exposure Guide very helpful when using pinhole cameras.

They are good to visualize f/stops below f/90, and what possible exposure times you are up against.

http://pinholeresource.com/store/agora.cgi?cart_id=8855183.18007&p_id=210&xm=on

That said, testing is the only true answer. Read the data sheet for any film before using.

 

[CBG]

Pretty much any film can be used under pinhole (or very low light) situations, but some films are less challenging than others. You will have longish exposures with a slowish film that is very prone to reciprocity losses.....

C