PDA

View Full Version : Reciprocity corrections for FOMAPAN 200.



kev curry
10-Nov-2007, 08:35
Does anyone know where I'd find Reciprocity corrections for FOMAPAN 200.
Regards kev

BradS
10-Nov-2007, 08:40
Have you looked at the data sheet at...
http://www.retrophotographic.com/technical.htm

BradS
10-Nov-2007, 08:45
Oops! they only posted the second page of the data sheet!

Digital truth has the whole data sheet at the bottom of this page...
http://www.digitaltruth.com/store/foma.html

The PDF has a little chart on the first page of the mfgr's data sheet (which is the second page of this "pamphlet").

kev curry
10-Nov-2007, 09:10
That was rapid Brad!
best
kev

kev curry
10-Nov-2007, 09:32
This was lifted from the data sheet:

Exposure (seconds).................1/1000–1/2 1 10 100
Lengthening of exposure......................1x 3x 9x 18x
Correction of aperture number.............0 -1,5 -3 -4

That throws up a couple of questions?
eg: if the meter reading was between 1 sec and 9sec's exposure, then x by 3?
if the meter reading was between 10 sec and 99sec's exposure, then x by 9?

Correction of aperture number....thats got me really baffled?

Put me into the light someone!
Kc

kev curry
10-Nov-2007, 13:05
This was lifted from the data sheet:

Exposure (seconds).................1/10001/2 1 10 100
Lengthening of exposure......................1x 3x 9x 18x
Correction of aperture number.............0 -1,5 -3 -4

That throws up a couple of questions?
eg: if the meter reading was between 1 sec and 9sec's exposure, then x by 3?
if the meter reading was between 10 sec and 99sec's exposure, then x by 9?

Correction of aperture number....thats got me really baffled?

Put me into the light someone!
Kc

Any clues on how to interpret the above, apols for not being the sharpest tool in the box!

regards
Kc

MIke Sherck
10-Nov-2007, 14:22
Reciprocity for this film is atrocious; just about the only thing I dislike with it. Here's how you interpret it:

Let's say you have a calculated exposure, everything included, of 1/2 second. According to the table above, you need no correction for reciprocity, so go ahead and shoot at 1/2 second.

Suppose the calculated exposure is 1 second? According to the table above, multiply the time by three (so you'd have a three second exposure,) OR open the aperture by 1 1/2 stops.

If the calculated exposure is 9 seconds, you really have to expose for 27 seconds or, again, open up the aperture by 1 1/2 stops.

If the calculated exposure is 10 seconds, the table says that you really have to keep the shutter open for 90 seconds, OR open up by three stops (that is, if you have calculated the exposure at 10 seconds at f/64, EITHER expose 90 seconds at f/64 OR expose for 10 seconds at f/22.

Did that make sense? If not, I can have another go at confusing everyone!

Mike

kev curry
10-Nov-2007, 14:44
Ahhh........ I see now as the blind man once said........
Clear as crystal Mike thanks
Kc