PCACala@xxxxxxx wrote:
> Hi all:
>
> I should have triple checked my text. I wrote:
>
> < the 80 mm Zuiko performs better at infinity than a 90 mm macro that focus to
> infinity, but goes to 1:1 with adapter >
>
> That should have said:
>
> The 80 mm Zuiko Macro performs better at 1:1 than a 90 mm macro designed to
> focus both to infinity as well as to 1:1 (typically by use of a 1:1 adapter).
>
> Sorry for the confusion. I had thought that C.H. Ling had reported to us the
> difference between a 90 mm Vivitar macro and the 80 mm Zuiko, but my memory
> seemes to have failed me.
>
> Contrast control in slide copying can be achieved by pre-flashing the special
> slide copying films. That gives a low level fogging exposure to the shadows
> in your original slide. The fog exposure plus slide exposure will help keep
> the shadows from blacking out. The technique is covered in books about slide
> copying. It is akin to fogging at Zone 1 or Zone II in books about the Zone
> System. Slide copies like the Bowens Illumitron (if I recall the name
> correctly) have circuitry to pre-flash the emulsion.
gary,
i just want to clear this, prefogging with transparencies will improve the
shadow
detail ans not the highlight detail on slide film? i use prefogging with b&w
printing all the time and this is to improve the hightlight detail. i just can't
understand how the prefogging with slides will improve the shadow detail, i
would
think that it would also improve the highlight detail.
francis
>
>
> Gary Reese
> Las Vegas, NV
>
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