Quote Originally Posted by HDNitehawk
A 100mm on a 1.6 will have a DOF greater by almost 1.6 than a 160mm would have on a full frame body at the same apertures.

By "at the same apertures" I think you mean "at the same f numbers". At the same apertures (ie, compare the 160mm lens at f/16 on FF with the 100mm at f/10 on 1.6FOVCF), the DOF would be exactly the same.


Quote Originally Posted by HDNitehawk


Lately thoughDenise has been posting macros that appear to have a fairly deep DOF, I believe using her new 70mm.


It makes me wonder if there is a benefit to shorter focal lengths using crop bodies for macro, just to get the deeper DOF at equal crop sizes.


I think this effect is very slight. From what I've seen and remember, Denise tends to shoot excellent medium closeups at less than 1x. For these, one can get good DOF without too much diffraction just by stopping down (if you're reading, please correct me if I'm wrong, Denise).