Re: nice spectral plots of both film & filters

[Dan Cardish <dcardish@xxxxxxxxxxxx>]

At 12:55 PM 20-04-98 +0000, w.j.markerink wrote:
>On 20 Apr 98 at 0:20, Dan Cardish wrote:
>
>> One thing that these charts drives home to me is the relative utility (or
>> lack of) of the various 87 series filters.  I have never been able to see
>> the reasoning behind using anything other than a #87 filter with HIE film.
>>  Since the 87 is visually opaque, it should be the most desirable for
>> non-scientific uses. The 'higher' order filters such as the 87C,B,A all cut
>> off useful IR from the film.  I can't see how there can be any gain in
>> image quality by eliminating any of the IR wavelengths past 700 nm.
>
>A #87 already cuts off usefull IR, at least when considering that the 
>Wood-effect starts at 695nm.
>
>Yet most people see a difference between #89B and #87C, and the same
>holds for anything darker. [snip]

Can you point me in the direction (on the web) of side by side comparison
photographs taken with 87 and higher filters?

Thanks

Dan C.


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