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Message: <blockquote data-quote="Chosun Juan" data-source="post: 3633705" data-attributes="member: 92780">John, as per the above football kicking, it would seem that a new 600mm f4 DO would come in anywhere from ~2.7kg(6lb) - 3.15kg(<7lb) ..... so a saving of ~1200 grams to ~800grams - hopefully toward the greater end of weight savings. There is also importantly a length reduction as well as movement of the centre of mass rewards. It should be hand holdable and a big improvement for BIF. As per the 400 it should also take a 1.4xTC quite well.I fully expect the new DO to come in under 3kg - I 'd suggest anything more would be a deal breaker considering the Big Whites are also rumored to be going on a diet of an unspecified amount along with other improvements for the Mark III version (see post#6 above). The new DO at 2.7kg or less would be simply sensational!Chosun   :gh:</blockquote>