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	treciprocity.1 - filmtools - various tools for photographic film development an…
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	treciprocity.1 (703B)
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	1 .Dd $Mdocdate$
	2 .Dt RECIPROCITY 1
	3 .Os
	4 .Sh NAME
	5 .Nm reciprocity
	6 .Nd calculates compensated exposure time for film reciprocity failure
	7 .Sh SYNOPSIS
	8 .Nm
	9 .Ar film
	10 .Ar time
	11 .Sh DESCRIPTION
	12 Photographic films suffer from low-intensity reciprocity failure
	13 during long exposures (usually >1 s). This program returns the
	14 compensated exposure time.
	15 .Bl -tag -width Ds
	16 .It Ar film
	17 specifies the film type and can be one of the following:
	18 .Bl -bullet -compact
	19 .It
	20 panf
	21 .It
	22 fp4
	23 .It
	24 hp5
	25 .It
	26 delta100
	27 .It
	28 delta400
	29 .It
	30 delta3200
	31 .It
	32 sfx
	33 .It
	34 xp2
	35 .It
	36 acros
	37 .It
	38 tmx
	39 .It
	40 tmy
	41 .It
	42 tmz
	43 .It
	44 trix
	45 .El
	46 .It Ar time
	47 is metered exposure time in seconds or format MM:SS
	48 .El
	49 .Sh AUTHORS
	50 .An Anders Damsgaard Aq Mt [email protected]