I think depth of field is related to magnification used rather than the size of the objective lens e.g. depth of field is greater at 8x than at 16x.
I think the difference the size of the objective makes is in the field of view which is smaller for larger objective lenses.
I think the reason people go for smaller objectives in HFT is that you can get them closer to the barrel giving less hold over at close ranges.
Last edited by Idlefrog; 13th September 2011 at 06:29 PM.