[Alt-photo] Re: density Pictorico film

[Sandy King]

Chris,

These days I just determine exposure time via testing the digital negative, with no reference to an analog step wedge. However, if I were to do adjustments based on the UV transmission of Pictorico the correction would be closer to a full stop than 1/2 stop. A full stop would be log 0.30, about what you should measure with a UV densitometer with either the regular Pictorico or the Ultra Premium. As you can see, the measurement of about 0.25 for Pictorico (regular and same measure about the same here) is very close to one full stop.


Sandy


On Nov 4, 2013, at 10:58 AM, Christina Anderson wrote:

> Sandy et al,
> This is interesting. I don't use, nor feel the need to, buy the Ultra Premium (is that the black label one?) but I do use the regular Pictorico and add 1/2 stop (by dividing the final printing time by .707). WIth your logs if I read logs correctly you are adding less than I, correct? I don't have a UV densitometer and just do it all by math and the Stouffers. 
> Chris
> 
> Christina Z. Anderson
> https://urldefense.proofpoint.com/v1/url?u=http://christinazanderson.com/&k=dsHy%2FVymniCD0osh6tze%2Fw%3D%3D%0A&r=dYT0wJ7z%2BCcVHeTjyqxYIEEvMAqwHSv5bUSBDFKI6dA%3D%0A&m=hMfKJRMg0oOJiTNpGHwqZSzV%2BETQB1JidLk7kCNrJ%2Fg%3D%0A&s=2e5059d7f0b163ceaecd7a3a152bb8afcc8b6f6d9f68b0b45dcb540f96100a19
> 
> On Nov 4, 2013, at 6:29 AM, Sandy King wrote:
> 
>> 
>> Early versions of Pictorico, back  around 2000,  measured about log 0.13 - 0.17 by UV transmitted light. Current versions, including Ultra Premiums, measure about log 0.25 - 0.26 by UV light. I have measured Pictorico with both an X-Rite 361T and a Gretage D200II so I am confident the density readings are reliable.
>> 
>> Sandy
>> 
>> 
>> On Nov 4, 2013, at 4:09 AM, Christian Nze wrote:
>> 
>>> I have  some revolution transfer HD and premium and also tecco at home if
>>> you want some sample
>>> just send me your address
>>> 
>>> 
>>> 
>>> 2013/11/4 Erich Camerling <e.camerling at tiscali.nl>
>>> 
>>>> Dear Members,
>>>> 
>>>> With my 365 nm UV-Densitometer I measured the optical densities of :
>>>> 
>>>> -Colorgate Screenfilm (from 2007 !)  D=0.67.  I ordered a new piece
>>>> yesterday
>>>> because they told me they have a new, better quality (CG Screenfilm) and I
>>>> want to measure that ( 0.13 ??)
>>>> 
>>>> -Permajet Digital transfer film 165 µ.  D=0.39
>>>> 
>>>> -Agfa Copyjet   D=0.28.
>>>> 
>>>> But I don't have Mitsubishi Pictorico OHP,premium OHP  nor Pictorica OHP
>>>> Ultra.
>>>> Can anybody send me a small piece? (5 x 5 cm) is enough.
>>>> I will put the data on the alt-photo site.
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