SIGMA to announce an 800mm f/6.3 before the end of February

I'd take an EF variant and slap a filter adapter on it... if the IQ better than the RF 800 f/5.6, and it was a good deal. Because the RF 800 f/5.6 essentially incorporates both an adapter and an internal TC, perhaps there's room to improve on it. Then again, Sigma never quite reached Canon IQ past a couple hundred mm.
 
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I'd take an EF variant and slap a filter adapter on it... if the IQ better than the RF 800 f/5.6, and it was a good deal.
Do you think it’s likely Sigma will make an EF version?

Because the RF 800 f/5.6 essentially incorporates both an adapter and an internal TC, perhaps there's room to improve on it.
IIRC, the EF 800/5.6L is optically better. Not that the RF isn’t also excellent, just a little less excellent. Similar to the EF 600/4 II being slightly better than the EF MkIII/RF. In both cases the RF lenses are much lighter, a worthy tradeoff for some. But I’d say there’s room to improve with a dedicated design vs. a tailored TC in back.

Then again, Sigma never quite reached Canon IQ past a couple hundred mm.
True. Maybe this time?
 
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But if it won't be available in Canon mount, and Nikon already has an affordable 800/6.3 (excellent condition copies under $4500), I'm kind of confused why Sigma would even bother? I might be interested in a Canon RF mount, seeing as how my EF 800/5.6 weighs as much as a minivan, but that doesn't seem too likely.
 
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But if it won't be available in Canon mount, and Nikon already has an affordable 800/6.3 (excellent condition copies under $4500), I'm kind of confused why Sigma would even bother? I might be interested in a Canon RF mount, seeing as how my EF 800/5.6 weighs as much as a minivan, but that doesn't seem too likely.
Sony doesn’t have anything modern at 800mm (until the leaked 400-800G is released).

I bet it will also be cheaper than the Nikon new and I don’t think it is fair to compare new to used since this will come down in price when it hits the used market too. The Nikon F 500/5.6 PF launched at $3600 while the Sigma 500/5.6 launched at $3000.
 
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But if it won't be available in Canon mount, and Nikon already has an affordable 800/6.3 (excellent condition copies under $4500), I'm kind of confused why Sigma would even bother? I might be interested in a Canon RF mount, seeing as how my EF 800/5.6 weighs as much as a minivan, but that doesn't seem too likely.
I won't be available on Z mount either, Sigma's FF mirrorless lenses to date have only been for E and L mount. At the moment there is no 800mm prime available for E mount so this would be more than welcome. I suspect/hope Sony will make an 800mm f5.6 or f6.3 GM at some point.
 
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Have been using the Sigma 150-600 for years and never better than on RF. recently though invested in an EF Sigma 800mm f/5.6 great condition for £1400. Motor a little noisy but great optically and a great value proposition.
I had a great copy of the Sigma 150-600, extremely sharp. However, its AF on the R5 was slow and I reluctantly let it go.
 
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I won't be available on Z mount either, Sigma's FF mirrorless lenses to date have only been for E and L mount. At the moment there is no 800mm prime available for E mount so this would be more than welcome. I suspect/hope Sony will make an 800mm f5.6 or f6.3 GM at some point.
Vengeance because Nikon is using many Tamron lenses as OEM Z lenses? ;)
 
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So, it looks like this rumor was wrong and it was a 300-600/4 lens! And what a lens it is. $6k! Half the price of the "big boy" 600/4 primes.

So...will this ever come to RF? Or Z? I have no doubt Sigma would love to sell this lens on those mounts. Will Canon or Nikon allow it? I think....probably not.
 
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Do you think it’s likely Sigma will make an EF version?


IIRC, the EF 800/5.6L is optically better. Not that the RF isn’t also excellent, just a little less excellent. Similar to the EF 600/4 II being slightly better than the EF MkIII/RF. In both cases the RF lenses are much lighter, a worthy tradeoff for some. But I’d say there’s room to improve with a dedicated design vs. a tailored TC in back.


True. Maybe this time?
The EF800 5.6L MTF (as was) is not as good as the EF600 f4L II and never got the same upgrade. I also think that the 600 f4 III was detuned a little from the II which seems to be the case from the MTF charts. So the RF600 MIGHT be similar in performance to the EF800, but would benefit from better coatings etc. As you suggest, perhaps not as good as it might have been.
 
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