elsa_cooper

Hey all,

I want to shoot some HP5 at 160 but on the massive dev chart i can only find HC110 times for ISO 100 (pulled 2 stops) and 200 (Pulled 1 stop). at 160 its pulled 1 and 1/3 stops. Anyone know how i calculate the dev times?

There's an app for calculating the dev times of in between values: https://play.google.com/store/apps/details?id=photography.darkroom.pro

Yeah, I almost added that disclaimer, but it is worth knowing about if he didn't.

It's also worth knowing the much bigger film development chart of Darkroom Solutions: darkroom-solutions.com.

Look there:

<a href="http://darkroom-solutions.com/?p=cdc&si=135&fi=Kodak%20Prof.%20Tri-X%20400&de=Kodak%20D-76&pu=1600/33%C2%B0%20%28N%2b2%29&di=1%2b0&te=20%20%C2%B0C%20/%2068%20%C2%B0F&ag=1%20Minute">http://darkroom-solutions.com/?p=cdc&si=135&fi=Kodak Prof. Tri-X 400&de=Kodak D-76&pu=1600</a></br>

This dev chart provides also times for 1+1 dilution and other temperatures than 20°C

<p>The times you suggest seems to be reasonable. The calculator of the <a href="https://play.google.com/store/apps/details?id=photography.darkroom">Film Developer app</a> says:</p>

<ul>

<li>Tri-X @ 3200 in Microphen 1+1 (Ilford agitation scheme, 20 °C): 27 minutes</li>

</ul>

<ul>

<li>Tri-X @ 3200 in Microphen 1+0 (Ilford agitation scheme, 20 °C): 14:45 minutes</li>

</ul>

 

<p>The developing times you can lookup at the <a href="http://darkroom-solutions.com/#cdtc">comprehensive dev times chart</a> or you use the dev times calculator app <a href="https://play.google.com/store/apps/details?id=photography.darkroom.pro">there</a>.</p>

<p>The dev times calculator <a href="https://play.google.com/store/apps/details?id=photography.darkroom.pro">there</a> says 4:45 min for Tri-X @ 200, Clayton F76+ (1+9, 20°C) with 30 sec agitation.</p>

<p>The <a href="http://darkroom-solutions.com/#cdtc">Darkroom Solutions CDTC</a> says Arista EDU Ultra 400 shot at 400 in D76 (1:1, 20°C) with 30sec agitation: 12:30 min.</p>

<p>I would recommend to look at the dev times chart at <a href="http://darkroom-solutions.com/#cdtc">http://darkroom-solutions.com</a>, because it's based on the manufacturers' instructions, it's comprehensive and it takes care of the agitation scheme. At MDC I never know about the agitation scheme. It seems that the time at 320iso you mentioned is for one agitation at start and one agitation after 10 minutes.</p>

<p>I agree to be consistent in the whole processing cycle, but the process starts with taking the photo. So, you said you use old cameras, then I would recommend to check or to let check the shutter speed of the cameras. Even if you would like to produce repeatable results it can be confusing if the cameras not working as expected. In my opinion the quality of the negative should have the greatest attention. For developing the negative the Rodinal developer should be a good start. Take care of the temperature, dilution, agitation scheme and developing time. For developing times there is a very comprehensive development times chart of almost all the common film/developer combinations: <a href="http://darkroom-solutions.com/#cdtc">http://darkroom-solutions.com</a>.</p>

<p>Development times can be found there: <a href="http://darkroom-solutions.com/#cdtc">CDTC</a><br /> Efke 100 / Rodinal / Dilution: 1+50 / Temp: 20°C 68°F / Agitation 15 sec : 10:30 min<br /> Efke 100 / Rodinal / Dilution: 1+25 / Temp: 20°C 68°F / Agitation 15 sec : 6:30 min</p>

<p> </p>