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500mm vs 600mm?

Started Nov 13, 2017 | Questions thread
Steve Balcombe Forum Pro • Posts: 15,582
Re: I'll complicate the matter a little...

GreyGoose wrote:

Directly comparing bokeh of refractive vs. diffractive optics, same background & aperture, at similar FL

This direct comparison is very convincing.

I've seen examples of very similar distracting bokeh from my 300 and 500 with TCs - shooting wildlife it's not uncommon to have problem backgrounds - so I've wondered whether there might be an element of confirmation bias in the examples chosen to illustrated the DO's blur quality. However yours is almost as direct as it can be.

I say "almost" - there is one key difference which is that you've used the 2x on the DO but only the 1.4x on the 600. The difference could be due to the Extender. Did you also try the 2x on the 600?

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