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

Joseph Smigiel smieglitz at gmail.com
Sun Sep 10 00:29:41 UTC 2017


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.


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
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> Alt-photo-process-list | altphotolist.org

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