It’s here, Canon RF 100-300mm f/2.8L IS USM officially announced

There's a developer interview (the pdf can be downloaded at the bottom of the preorder page on usa.canon.com) with this statement:

The drop-in filter was omitted by pursuing a compact size, reduced weight, and an optical design where the lens group is placed close to the mount. As a result, the large diameter of the lens barrel, which was a concern in terms of lens strength, has been removed, and the thinner outer barrel also contributed to further weight reduction.
This lens should have never been released without a drop-in filter. It's a glaring omission and oversight for outdoor sports and motorsports. I'm seriously so mad about this...it's a joke that they expect us to walk around with 120mm filters. On any given day I'll use a CPL and at least 2 ND strengths. So that's 3 massive, expensive filters that I have to worry about and keep clean because they're now exposed externally, and I have to remove the lens hood every time I want to rotate the CPL or change the filter. I'm just astonished they thought this was a good trade off. It makes the lens totally useless for me.
 
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Without a drop-in CPL (or at least a flap at front like 70-200/100-500) it is useless for almost any motorsport, automotive and many outdoor sport-photographers as canon presents this lens for. :oops::oops::oops: What the hell...:sick:
This is one of the most insane miscalculations and mistakes I've ever seen. This is far worse than the 100-500 not being able to use extenders unless it's zoomed out to 300mm. No, that's a strange compromise. This is a totally absent-minded choice that ruins the functionality of a lens for an entire demographic of photographer. It's 100% an unusable lens for motorsports and automotive or anyone that wants to creatively use ND filters for shutter/aperture control. This is nothing more than a $9500 indoor sports lens now.
 
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Curious about this line in Adorama’s description:

“The Canon RF 100-300mm F2.8 L IS USM Lens is the lightest f2.8 lens with a 300mm focal length at the time of its release.”

It’s just barely heavier than the 300 IS II, guess they meant to say “lightest f/2.8 zoom lens”. Seems like a cool lens but not for me, personally not thrilled if this is the direction Canon’s heading with their RF super tele’s. A 300mm f/2.8 DO with a built-in extender would have been a pre-order for me. Guess it’s time to think about switching to Nikon, bummer because I really love my R3.
I am pretty sure that was supposed to say "lightest f/2.8 zoom lens".
 
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There's a developer interview (the pdf can be downloaded at the bottom of the preorder page on usa.canon.com) with this statement:

The drop-in filter was omitted by pursuing a compact size, reduced weight, and an optical design where the lens group is placed close to the mount. As a result, the large diameter of the lens barrel, which was a concern in terms of lens strength, has been removed, and the thinner outer barrel also contributed to further weight reduction.
I figured that was why I saw the lens was 5.8 pounds.
I figured there must have been a 6-pound requirement.
That is what they get for not using the metric system.
 
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The weight of the bare lens is, according to Canon 2650g and the EF300II, according to TDP is 2350g, but with the EF-RF adapter (110g) and a much larger hood (80g?) the weight difference is much less, a 100-ish grams. That does add up when using it all day, though. And like you say, the lens itself is much larger.

With the zoom function only adding a 100-ish grams in total, it makes me wonder what the weight for a prime would have been, I bet far, far lighter than the EF300II.
The hood is smaller (shorter) to accommodate the wide end of the zoom, and thus as with most zoom lenses it’s not terribly effective at the long end…which for this lens is where it will likely be used most.

Of greater concern to me is that the zoom adds 7.5 cm / 3” in length. Not that such a lens is ever going to be unobtrusive, but that’s a big add over the EF prime.
 
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This is far worse than the 100-500 not being able to use extenders unless it's zoomed out to 300mm. No, that's a strange compromise.
...or the 70-200 without any Extender usability. :ROFLMAO:

If this lens would be an all in all more flexible successor of the 300/2.8 and would cost around 7.5k $ okay, but ~12k all incl. here in europe I´m not in the mood for compromises of things generations and generation before have it.

For now I have ordered one and I will test it (hopefully with at least a 120mm front-thread), but I´m not really happy to spend 12k for a compromise.
 
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...or the 70-200 without any Extender usability. :ROFLMAO:

If this lens would be an all in all more flexible successor of the 300/2.8 and would cost around 7.5k $ okay, but ~12k all incl. here in europe I´m not in the mood for compromises of things generations and generation before have it.

For now I have ordered one and I will test it (hopefully with at least a 120mm front-thread), but I´m not really happy to spend 12k for a compromise.
For the price of one 120-300 lens you can get the EF300 f/2.8, two R8s and the RF100L lens! And have money left to take your family out to dinner.
 
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Surprised that I seem to be one of the few people truly excited for this lens :ROFLMAO:

Most of my work for newspapers would really benefit from this lens in different capacities. While I love having the 300 2.8 for basketball and football, it's not super practical to need to use three cameras to cover 24-70, 70-200, and 300. I see this lens as basically replacing the 70-200 and 300 for most sports, since I won't miss the 70-100mm range between the 24-70 and 70-200. That saves me from needing to use 3 cameras to cover the same range, and will definitely be a big plus for not having to switch cameras.

Same thing goes for breaking news--this will be an excellent news lens for a lot of breaking news and event photography where 300 2.8 is a really nice bonus when it's dark and you're needing range.

For me, add to the fact the 2x makes this a 200-600 F/5.6, and things only get better from there. I often use the 100-400 with a 1.4x for a 140-560mm F/8 on field sports, so having the option to make it into a 200-600mm F/5.6 will be excellent for that use. Even better, instead of having to swap the 140-560 combo for a 70-200 2.8 when it gets darker, I'll just toss off the extender at halftime and keep shooting.

Another bonus is wildlife, it's tough using the 140-560 F/8 combo when things get into the shade or later into the evening, so 200-600 will be a really nice range at f/5.6 for those uses too.

I personally never use CPs or NDs, so I'm not hugely bothered by that omission
 
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Canon is positioning this as a lens for indoor sports.
The EF 100-400 f/4 x 1.4 is the outdoor sports lens.
Canon says: "...the lens primarily appeals to professionals and enthusiasts who specialise in sports photography – from indoor sports to motorsports."
For the price of one 120-300 lens you can get the EF300 f/2.8, two R8s and the RF100L lens! And have money left to take your family out to dinner.
I know, but then I still don't have any fast zoom lens.
 
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Price in UK = £11,499. Take off the 20% tax (VAT), convert tax-free price to $ gives $11882 = 25% mark up by Canon. Forget it Canon.

And lenses are made of bread: The Canon RF100-300mm F2.8 L IS USM offers excellent optical quality, edge-to-edge. Its optical design includes one flourite lens,
Canon India also started to price gouge customers on lenses quite heavily to subsidize US market.
 
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