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Re: [ATM] Wratten #3N5 filter responses



Dominic-Luc Webb wrote:
> It is known that the 3N5 is used in B&W photography. It is in
> fact one of the more popular filters for B&W.
>
>   
The neutral density part makes it much more limited for astronomy 
though.  In B&W photography yellow is used in landscapes and helps 
darken the sky some.  Not as important with some of todays emulsions.

Ken Lowther
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