How did this happen? M7, Yellow Filter, Rollei 80s

[robglickman]

if you shot the film at 80 then that also adds to the underexposure. RR80s in most developers is an EI 50 film. the only developer that I shoot it at 80 with is beutler and it gives amazing results. to me it looks under exposed and a little under developed. do you know what developer they use?

No, I didn't ask ..
Now I am home, back in San Diego ..
The chemistry is all new to me, next time I will definitely ask ..