My spouse and I are walking the Overland Track from Cradle Mountain to Lake St Clair in just over a month. The lenses currently in my kit are Tamron 18-250 f3.5-6.3 (which will be the main lens I presume will be attached to my Pentax K5), Pentax FA 50 f1.4, and a Sigma 10-20 f4-5.6. Although I received advice from a fellow bushwalker photographer that I would not require longer lenses, I am becoming doubtful about walking without my beloved DA*300 f4 and a teleconverter or two.
So, I would particularly appreciate any advice re the value of taking a long lens for birds in particular.
As this is a significant weight decision (1.5kg), taking it with me means I have to give up other things.