Re: [Leica] TMZ revisited: the facts

["Rob Studdert" <audiob@ozemail.com.au>]

On 6 Sep 98, at 12:11, Erwin Puts wrote:

> Here some densitometer values to prove the underexposure scenario.
> 
>  TMZ  as 1000	as 1600		as 3200
> 
> Zone 1		0,04	0,00		0,00
> Zone 2		0,11	0,06		0,01
> Zone 3		0,30	0,14		0,08
> Zone 4		0,54	0,24		0,31
> Zone 5		0,70	0,40		0,42
> Zone 6		0,93	0,57		0,70
> Zone 7		1,15	0,71		0,88
> Zone 8		1,34	0,89		1,13
> Zone 9		1,50	1,04		1,34
> Zone 10		1,65	1,18		1,51
> 
> The film exposed at EI 3200 has been developed in Varispeed,designed to
> exploit the inherent film densities. This can be seen in the higher
> values, where the curve is steeper than in the EI1600 case (deleoped in
> XTOL).But even the Varispeed cannot get shadow detail as can be seen in
> the lower values of the shadow parts (zone 1 to 3). The EI1000 exposure
> gives a vey nice curve and a printable range from zone 2 to zone 8. Below
> 0,10 and above 1,30 there is no detail to be printed. What happens in the
> 3200 case: we see the same values as in the 1000 case (0,08 to 1,34) but
> shifted two stops. As theory has it. In many situations where you will use
> the EI3200, the faces of persons are very well lit and the rest is dark.
> The very overexposed faces are now high in the range and can be easily
> printed. No shadows however, but quite often there is no shadow, so the
> absense of shadow density will not be noticed. Exactly the same analysis I
> did for Neopan 1600 and Delta400 and Tri-X all at nominal speeds and 1 and
> 2 stops underexposed. Results identical, with of course the usual
> variations in film character. The thin negative of the ZMZ at EI1600 could
> be improved with some lobger development.
> 
<snip>
> 
> Erwin
> 

Erwin,

As noted TMZ at EI1000 produces good greyscale linearity, which developer 
was used for the TZM shot at EI1000? does the linearity remain similarly 
constant when TMZ is shot at EI800? At EI800 does the film start to lose 
dynamics?

Cheers,


Rob Studdert
HURSTVILLE AUSTRALIA
Tel +61-2-9554-4110
Fax +61-2-9554-9259
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audiob@ozemail.com.au