How to save thousands and still get 800mm f/5.6 L IS USM and RF 1200mm f/8 with this one weird trick

[pRICE cUBE]

https://fstoppers.com/gear/why-shouldnt-...ses-597665
OK, that was totally a clickbait topic because you still have to spend over $10k for anything. This writer says don't but Canon's recently announced $17K and $20K 800mm f/5.6 L IS USM and RF 1200mm f/8 lenses.



Buy this instead and save thousands:
Extender RF 2x: $599 and Canon RF 400mm f/2.8 L IS USM: $11,999
Differential: $4,401

Canon RF 600mm f/4 L IS USM Plus Extender RF 2x: $13,598
Differential: $6,401

[Racer X]

But will the eye controlled auto focus still work on my Elan IIe?

[DP]

Many wish they had known this trick...

[Gareth]

But how are you supposed to get to 1600mm f/11 and 2400mm f/16?!?!?!?!

Supposedly, the RF extenders don't stack, but I haven't looked into that and am just going off a FredMiranda for sale post where someone wanted to trade their RF 400mm for an EF 400mm so they could stack teleconverters.

[pRICE cUBE]

DP wrote:
Many wish they had known this trick...

Corporations hate this!

[DP]

What's the one about "this tiny company...."?

[Racer X]

pRICE cUBE wrote:
[quote=DP]
Many wish they had known this trick...

Corporations hate this!
HOWEVER, if the converter isn't optimized and matched to that lens, the results aren't as good. How much less, I don't think anyone has calculated. If I had gotten that job at DxO labs, I would have let you know.

[AllGold]

I'm sure (almost) it's not merely a 2X teleconverter built in to the lens.