[alt-photo] Was New Platinum Prints

[Bob Barnes]

I am asking for community help, in spite of the fact I rarely post,  
really because there are so many
that have expert knowledge, and are unbelievably generous.

I am asking for advice about about starting wet-plate collodian and  
Ambrotypes.
I would appreciate any advice, links, on-list as well as off-list.    
I am very interested in printing wet-plate
  on my  Omega DXL enlarger. I have a 4x5, an 8x10 as well as a large  
antique studio camera, and I do want advice
about finding or adapting wooden film holders, but I am very  
interested in enlarging or digital negs.
Thanks to you all!
Bob Barnes



On Apr 13, 2010, at 2:50 PM, Loris Medici wrote:

> I see, you're coming from the signal processing perspective. I can
> relate to that; the mottling case I was talking about early which I
> experienced while printing cyanotype with imagesetter negatives for
> instance. The dots invisible to unaided eye were still negatively
> affecting the image quality, because they were exhibiting a
> perceptible effect.
>
> I'm not telling that digital negatives as better than in-camera
> negatives in terms of detail / sharpness BTW. All I'm saying is what
> I'm getting is enough to me, for practical purposes. Taking the fact
> that I'm a kinda fastidious person into consideration, if that's
> enough for me then it's way enough for my audience methinks. Hint: My
> sign is Aries ;)
>
> Regards,
> Loris.
>
>
> 2010/4/13 etienne garbaux <photographeur at nerdshack.com>:
>> ...
>> The limits you mention are where the digineg artifacts should, in  
>> theory, be
>> equal to the resolution-limiting effects of the process itself.   
>> However,
>> the eye can still resolve the artifacts at this level, just as the  
>> ear can
>> hear "down into the noise," because a process's ability to resolve
>> deteriorates gradually rather than falling off a cliff at the  
>> limit.  To
>> make the artifacts truly invisible, they need to be lower than the  
>> process
>> limit by a factor of 4-8 (this includes the 2-4 factor discussed  
>> below),
>> implying a digineg resolution 4-8x greater (ppi) than the process  
>> limit.
>> ...
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