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Canon officially announces the EOS R5 and EOS R6 along with 4 new lenses and two teleconverters

Interesting that the extenders only extend focal range from 300-500 mm on the 100-500mm lens. This is an interesting and potentially amazing advance. It will preserve the wide of 100 and 200 while extending the reach to 700-1000mm. I assume sacrifice in f stop throughout range but not sure about that as well. Would be amazing if it didn't impact f stop either until 300mm.
 
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Interesting that the extenders only extend focal range from 300-500 mm on the 100-500mm lens. This is an interesting and potentially amazing advance. It will preserve the wide of 100 and 200 while extending the reach to 700-1000mm. I assume sacrifice in f stop throughout range but not sure about that as well. Would be amazing if it didn't impact f stop either until 300mm.

I was getting the impression that it was stopping you from zooming in closer.
 
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Interesting that the extenders only extend focal range from 300-500 mm on the 100-500mm lens. This is an interesting and potentially amazing advance. It will preserve the wide of 100 and 200 while extending the reach to 700-1000mm. I assume sacrifice in f stop throughout range but not sure about that as well. Would be amazing if it didn't impact f stop either until 300mm.

I think it means that you have to extend the lens to 300mm before you can mount the extender. If that's true it is actually a hindrance because you won't have
100-300mm available and also cannot pack the lens with the extender on.
 
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I am sold!! Congratulations Canon!! You did it!! I even think now that the 100-500 as a fair price (I wish it was a bit cheaper but it´s fair)! Definitely I will buy the R5 and the R6 but now I am thinking also about the 100-500! The new ISO capabilities makes the F7.1 less relevant! DAmn I am even thinking in the print!!!

I am very excited and looking forward th get my hands in this diamonds!!! THANK YOU CANON!!
 
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I was getting the impression that it was stopping you from zooming in closer.
That would be a bit of a bummer and make the lens not nearly as valuable for landscape. I use my 100-400 for shooting dunes and definitely work throughout the focal range. I guess you would definitely not be using either extender as a result.

Same with some wildlife shots. I don't always need to be at 400. Sometimes you are able to get close enough that the short end of the 100-400 is all you need or you want to add some context to the wildlife shot and shoot the animal/bird wider. Won't be useful for this situation either. Makes me think I will not be pre-ordering the extenders until I think that through a bit more.

After re-reading the product introduction on the B&H site I think you are right. Limiting this lens to either a 420-700 or a 600-1000. Not sure how I feel about that. Adding and removing those extenders in field is not an option most of the time. Definitely either shooting long or over 100-500 range but not both.
 
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I think it means that you have to extend the lens to 300mm before you can mount the extender. If that's true it is actually a hindrance because you won't have
100-300mm available and also cannot pack the lens with the extender on.
This. Here's what DPreview has in their write-up:

"The 100-500mm is compatible with Canon's new RF 1.4x and 2x teleconverters, though the lens must be set to 300mm or longer before one can be attached. A physical hard stop prevents the user from accidentally zooming out past 300mm with these teleconverters."
 
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