Delta 100 in HC-110 pushed to 250?

[richard_volet]

<p>I had been shooting Ilford Delta 400 at e.i. 250 (my usual film/ei choice), when I shot a roll of Ilford Delta 100 and forgot to change the ISO setting on my camera. So I have exposed the roll of Delta 100 at e.i. 250.<br>

I use HC-110, dilution B as my regular developer. Ilford suggests 8 minutes for e.i. 200. and 6 minutes at 100.<br>

Any advice for my roll at e.i. 250? 9 minutes?<br>

Thank you from first time poster, Richard</p>

[larrydressler]

<p>The difference between 200 and 250 is so small I bet that 8 minutes will have you in the ballpark.</p>

[Mike Gammill]

<p>If the pictures are important you might want to try a test roll of Delta 100 @ E.I. 250 with 8' in HC110-B. If not, there's still a good chance you'll have printable negatives. Contrast will be higher as with most pushed films.</p>

[john_shriver]

<p>If you can source a speed-enhancing developer such as DD-X, Microphen, or XTol, you might get slightly better shadow density.</p>

[richard_volet]

<p>Thank you for your suggestions. I think I'll try the Microphen. I have used that once before, pushing Delta 400, which did give me better results than HC 110.</p>

[lenny_eiger]

<p>Xtol is always a good choice, however, there is only a small speed enhancement. The key point is to remember that exposure and development have nothing to do with each other. It's the basic tenet of the zone system and its as correct as it gets (about 99%).<br>

The only thing that adding development time will do is add contrast, which is useful some of the time... when shooting in low light, or compressed lighting, like inside light...</p>

 

[richard_volet]

<p>Lenny, interesting point. Having made the mistake I did, setting the meter to the wrong ISO (therefore not exposing in the intended zones), what would you do? How would you then develop the film?</p>

[glen_h]

<p>Delta 100 doesn't seem to be on the Diafine box. Otherwise, I might have recommended that.</p>

[Mike Gammill]

<p>The Massive Developer Chart shows an E.I. of 50 for Delta 100 with 5' each in part A and part B at 75 degrees Fahrenheit. Don't think it would be much help.<br>

I think going with Microphen is the best option. </p>

[larrydressler]

<p>Delta 100 looses speed in Diafine.</p>

[richard_volet]

<p>Thanks everyone. I developed the roll in Microphen for a little over 8 minutes. I haven't scanned or printed (darkroom) yet, but the negs look very good.They might be just a wee bit underexposed compared to my usual negs and they are not excessively contrasty. Looks like they'll print quite well.</p>

[glen_h]

<p>As I noted, it isn't on the Diafine box. (I just bought a box last week.)<br>

But yes, many newer films do lose speed. I am surprised about the 5', though.</p>

[glen_h]

<p>As with many Ilford films, they say:</p>

<blockquote>

<p>should be noted that the exposure index (EI) range recommended for 100 DELTA Professional is based on a practical evaluation of film speed and is not based on foot speed, as is the ISO standard.</p>

</blockquote>

<p>they then gives development times for EI 50, 100, and 200.<br>

I am not so sure what the speed would be based on ISO standards.</p>