Archived posting to the Leica Users Group, 2004/07/20

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Subject: [Leica] Re: Kodak BW400CN
From: pdzwig at summaventures.com (Peter Dzwig)
Date: Tue Jul 20 01:53:44 2004
References: <000201c46df3$49c934a0$6401a8c0@dorysrusp4>

Don,

Fascinating about the chemistry.

So are you saying that in some ways you can think of these films rather like 
digital media in that you can effectively change ISO within a single roll 
and 
you should get something usable without compromising neg quality too much?

Peter Dzwig

Don Dory wrote:

> Adam,
> You don't really push or pull C-41 with these chromagenic films.
> Basically you are trusting to the really long characteristic curve of
> these films.  At the low ISO settings you find more of the image from
> the shadows, lose detail in the highlights, and reduce contrast. At the
> high ISO settings you lose shadow detail and gain more detail in the
> highlights.
> 
> The chemistry of C-41 films is fascinating.  Each color layer is at
> least two; one of high sensitivity and one of low sensitivity.  Within
> each layer is a chemical restrainer that doesn't let the density build
> up too fast or too far.  The restrainers are why four stops overexposed
> can still produce flat but reasonable prints.
> 
> 
> Don
> dorysrus@mindspring.com
> 
> -----Original Message-----
> From: lug-bounces+dorysrus=mindspring.com@leica-users.org
> [mailto:lug-bounces+dorysrus=mindspring.com@leica-users.org] On Behalf
> Of Adam Bridge
> Sent: Monday, July 19, 2004 7:29 PM
> To: Leica Users Group
> Subject: Re: [Leica] Re: Kodak BW400CN
> 
> So how do you ask to have it processed if you're going to shoot at 50
> which is pulling the film 3 stops. Do you then get an incredibly thin
> negative that's still scannable?
> 
> I'm just curious because I haven't liked the resuilts when I shoot TCN
> at 200 wtih normal processing and I don't want to process it for 200
> (read I'm too damn cheap and don't like to wait the extra time it
> takes.)
> 
> Thanks for any thoughts. It's good to know that there is SOMETHING
> about this new BW400CN that people are liking.
> 
> adam
> 
> 
> On Mon, 19 Jul 2004 17:14:10 -0700, JCB <jcb@visualimpressions.com>
> wrote:
> 
>>At 04:55 PM 7/19/2004, Oliver wrote:
>>
>>
>>>When I dropped off some color negative film at the New Lab today I
> 
> asked
> 
>>>whether they had formed an opinion on BW400CN, the successor to
> 
> TCN400. I
> 
>>>was told that the new film is sharper and has better shadow detail.
> 
> The
> 
>>>reply to my question whether the new film should also be rated at ISO
> 
> 200
> 
>>>was, "most pros who want a little extra snap in the prints expose it
> 
> that
> 
>>>way."
>>>Oliver Bryk
>>>PS www.newlab.com is the leading pro color lab in San Francisco.
>>
>>
>>Like T400CN, BW400CN has a huge latitude. Kodak states ASA 50 thru 800
> 
> can
> 
>>be used with confidence with normal processing. Of course, what you
> 
> take
> 
>>your light meter reading of (its reflectance) will make the biggest
>>difference in your results regardless of the ASA you use.
>>
>>Even though it is called "400", most folks find it marvelous at 200.
> 
> As you
> 
>>probably do. I have used it at both ends, 50 to 800, and have not been
>>disappointed.
>>
>>JB
>>
>>PS... www.calypsoinc.com (Calypso Imaging) is the leading pro
> 
> color/B&W lab
> 
>>in the south bay.
>>
>>
>>
>>
>>_______________________________________________
>>Leica Users Group.
>>See http://leica-users.org/mailman/listinfo/lug for more information
>>
> 
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> 
> 
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> 



Replies: Reply from dorysrus at mindspring.com (Don Dory) ([Leica] Re: Kodak BW400CN)
In reply to: Message from dorysrus at mindspring.com (Don Dory) ([Leica] Re: Kodak BW400CN)