Development time for Arista 400 @ 800 in ID-11

[pismo923]

I recently pushed Arista Premium 400 one stop and want to develop with ID-11 (stock). I have looked at the Massive Dev Chart and no times are given for 800. I did notice that the chart indicates that Tri-X in D-76 times development times are the same whether shooting at 400 or 800. Does this apply as well to AP in ID-11. I was going to interpolate between 400 and 1600 times and try 8.5 minutes. Any suggestions or recommendations?

 

[Leigh Youdale]

S we don't have Arista in this country I've never used it, but I think I've seen people claim it's Tri-X repackaged. Whatever.
The Ilford charts for ID-11 don't give any times either, but that's not because it's not recommended. It simply means they haven't tested it.
I'd be inclined to use the time for Tri-X @ 400 in ID-11 stock but increase the time by 20% for 800. Say 9 mins.

 

[pismo923]

Thanks Leigh. I will give that a go and see where it takes me.