That's why I'd like to see some samples of the combo. From what I've seen on some shorter 2.8 telephotos the TC2 doesn't seem to degrade IQ that badly when stopped down a few extra stops from wide open.A 400mm f/2.8 must indeed be wonderful to shoot but the TC2.0 seriously affects IQ which forces you to downsample if you want to maintain the same quality.
A TC1.4 only costs some % of loss but a TC2.0 is meh.
That's why I'd like to see some samples of the combo. From what I've seen on some shorter 2.8 telephotos the TC2 doesn't seem to degrade IQ that badly when stopped down a few extra stops from wide open.
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