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From: charles on 13 Jul 2010 22:20
on this page
http://www.bhphotovideo.com/c/buy/For-Black-White-Contrast/ci/113/N/4288586952

The first listed item is

122mm 040 Yellow-Orange (16) Glass Filter

The 122mm is obvious, what do the numbers "040" and "(16)" mean?

I'm guessing that the (16) refers to the old Wratten filter number.
anyone know?

From: Peter on 14 Jul 2010 09:11
"charles" <ckraft(a)SPAMTRAP.west.net> wrote in message
news:lh7q36p04jj9g42dms932bagvo6nh91v04(a)4ax.com...
> on this page
> http://www.bhphotovideo.com/c/buy/For-Black-White-Contrast/ci/113/N/4288586952
>
> The first listed item is
>
> 122mm 040 Yellow-Orange (16) Glass Filter
>
> The 122mm is obvious, what do the numbers "040" and "(16)" mean?
>
> I'm guessing that the (16) refers to the old Wratten filter number.
> anyone know?
>

You can ask B&H, right on their website.

--
Peter

From: Allen on 14 Jul 2010 15:04
krishnananda wrote:
> In article <4c3db7c9$0$5546$8f2e0ebb(a)news.shared-secrets.com>,
> "Peter" <peternew(a)nospamoptonline.net> wrote:
>
>> "charles" <ckraft(a)SPAMTRAP.west.net> wrote in message
>> news:lh7q36p04jj9g42dms932bagvo6nh91v04(a)4ax.com...
>>> on this page
>>> http://www.bhphotovideo.com/c/buy/For-Black-White-Contrast/ci/113/N/42885869
>>> 52
>>>
>>> The first listed item is
>>>
>>> 122mm 040 Yellow-Orange (16) Glass Filter
>>>
>>> The 122mm is obvious, what do the numbers "040" and "(16)" mean?
>>>
>>> I'm guessing that the (16) refers to the old Wratten filter number.
>>> anyone know?
>>>
>> You can ask B&H, right on their website.
>
> 16 is the Kodak Wratten number; 040 is B+W's number for the same color.
The only one of the Wratten numbers still lodged in my memory is 25 for
red, as in the RGB (A-B-C5) color separation set. Can't even remember
the number for the oft-used K2. I assume that 16 is the G filter.
Allen
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