How long can Neopan 1600 last?

I've a frozen roll from 05. Also a roll of Delta 3200 a little older. Are they beyond use?

I don't think anyone is going to be able to give a definite YES or NO to this but if frozen from fresh then they are likely to be OK.

I might want to expose at less than box speed but the true speed of Neopan 1600 is said to be only 800 anyway and D3200 about 1250 max.

Worth trying as long as what you take aren't shots designed to win competitions or are otherwise unrepeatable.

pentaxuser