Delta 3200 developed at 6400 seemingly underexposed
Hey, I‘m pretty new to home development and decided to shoot and develop a roll of Ilford Delta 3200 at 6400 since it apparently is a pretty flexible film stock.
I shot on a Canon 1000FN with a Sigma 17-50mm F2.8, manually setting the ISO to 6400 and relying on its light meter for exposure, like I usually do with good results.
I used fresh stock D-76 for development, 13 minutes at 20°C, as suggested online by the Massive Dev Chart. It didn’t say anything about agitation, so I did the first minute continuously then the first 10 second of each minute, like I usually do with good results.
I scanned on a simple negative scanner with built-in inversion which usually yields good results.
Now what I find weird is that my pictures almost all look like they’re underexposed by at least a couple stops of light. The pictures above are a few examples. Does anybody know where this could come from?
tl;dr:
Ilford Delta 3200 at 6400, shooting on Canon 1000FN with working auto exposure.
Developing for 13 minutes with stock D-76 at 20°C, „standard“ agitation.
Pictures look very underexposed, why?