[Alt-photo] [Alt-Photo] Wet Plate Collodion Sensivity Filter for Normal Film

Joseph Smigiel smieglitz at gmail.com
Sun Sep 10 00:31:47 UTC 2017

Forgot the URL in my previous post:



On Sep 9, 2017, at 8:29 PM, Joseph Smigiel wrote:

> Mustafa,
> Salted collodion is UV-sensitive well below 400nm and the sensitivity drops to almost nothing around 500nm. See the graph in this post on the collodion forum.
> The transmission of quartz lenses and modern lens coatings may also be factors in the overall exposure.
> An orthochromatic film emulsion may get you close to the collodion sensitivity, but I don't believe any filter will mimic the collodion sensitivity since a filter can only subtract rather than extend the range. IIRC, a Wratten #44 cyan will be about the best you can do if using panchromatic film.
> Joe
> On Sep 9, 2017, at 5:03 PM, Mustafa Umut Sarac via Alt-photo-process-list wrote:
>> I looked to wet plate collodion sensivity and it starts from 400 goes to
>> 512. Mid zone is the most sensitive. Who can make me such a filter to take
>> same spectral picture on ordinary BW film ? And to what cost ?
>> Mustafa Umut Sarac
>> Istanbul
>> _______________________________________________
>> Alt-photo-process-list | altphotolist.org

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