RF 600mm f/4 L IS USM

[Fast Glass]

So looking at your tests, it's bizarre that the EF 2x III is better, but Bryan's crops show the RF 2X having a clear advantage.

My only explanation is the RF extender is optimized for the RF 600mm. Which if I am correct is optically the same as the III. And since you were testing it on the EF 600mm f/4 II. Maybe that is the reason for the discrepancy between your results and Bryan's results.

But even then it hardly makes a lot of sense since the 600mm II is actually a touch sharper than the 600mm III.

There possibly could be some sample variation in the mix as well.

[HDNitehawk]

But even then it hardly makes a lot of sense since the 600mm II is actually a touch sharper than the 600mm III.

There possibly could be some sample variation in the mix as well.

Copy variation?


I ordered the RF 1.4 and RF 2x extenders last night.
Also ordered LensCoat in RealTree, wasn't able to get the Hoodie though.
Went with the Lowepro Lens Trekker 600 AW III, I would have went with the Tamrac version but apparently they do not make their Expedition 9 anymore and the version they had for big lenses were not in stock.
I am set.

[Busted Knuckles]

This looks like a job for the guys at lens rentals