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

The other big whites (500 mm f4, 400 mm f2.8, 600 mm f4, 800 f5.6) are all larger in diameter and 112 mm is the largest commercially available threaded filter available (based on my searches at B&H). Basically, the 300 mm f2.8 would be the only big white compatible with a threaded filter. It is interesting that Canon made this decision because to my knowledge the RF 100-300 mm f2.8 is the first 300 mm f2.8 lens to ever use a threaded front filter.
Yeah, I think it was designed without a front filter or built-in teleconverter in mind from the start.
Nikon made the same decisions with their 120-300 f/2.8.
Nikon could quite easily use the same optics and make a Z-mount version with plenty of room for both a teleconverter and drop-in filters.
 
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Canon has offered alternative hoods before.
This one would make sense.
That being said, I would be more willing to bet on a third party coming up with that.
According to the 13 April CR rumour, the existing hood, if bought as a separate item from the lens, is pretty expensive:

  • Lens Hood ET-124: $650
An alternative genuine Canon hood would undoubtedly cost significantly more, due to additional design/manufacturing costs, and low demand.

It's possible that a (Chinese?) third party could produce an alternative and sell it at a fair price, but whether there would be enough demand for it is another matter entirely. I wonder how many of these lenses Canon will sell, and what percentage of users want/need to use CPL or ND filters?
 
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Can you get a combined CPL/ND drop in filter or are they always separate like the control ring drop-in filters?
They do exist.
The shortcoming of rear drop-in filters is that they can't be stacked.
That means I either have to buy a bunch of combined filters or combine them with front filters.
Are you saying there’s a combined CPL/ND drop-in filter? I know there are screw-in filters like that, but putting one in the drop-in holder would leave no way to rotate the filter once in place.
 
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For me the purpose is physical protection and it prevents one from accidentally scratching the front element. Last year I managed to physically scratch the front element of one of my large big white lenses. $950 and 3 months later I got the lens returned from Canon. I would rather replace a $300 filter in a couple of days than the alternative.
I've used super-teles with scratches on the front element, and have never noticed any impact to image quality. Did it get hit by a baseball or something?
 
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I don't understand the complaints about lack of "mid range" RF lenses. This is really a great time to be a Canon user. You can have a great R mount camera and use hundreds of previous model EF lenses on it seamlessly. I would think the latest EF L glass bought used would be more desirable than a "mid range" RF lens. There are great deals: 100 2.8 or 135 2.0 for 500-600? How about 35 1.4 or 85 1.2 for under 1000.? Not to mention zooms. And they all perform better on mirrorless than they did on DSLRs. What's not to love?
Adapted glass is not a great solution, especially not for pros. Adapters are annoying to deal with unless you buy one for each adapted lens and leave it permanently attached. Since Canon doesn't seem to want 3rd party glass on RF to fill the gaps, it's not unreasonable for people to want Canon to hurry up and release at least the key lenses.
 
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…112 mm is the largest commercially available threaded filter (based on my searches at B&H).
The Fotodiox filters that I use with my Wonderpana system (front filter setup for my TS-E 17) are 145mm threaded. I have the 10-stop ND and CPL, but they make a UV version. They also have an XL system for the 11-24/4 that uses 186mm threaded filters.

112mm is the largest filter available from B+W, though.
 
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This was actually really fun and enlightening to read through. Let me preface. I cannot afford this lens. This announcement has made my decision for me. Buy an EF 300mm f2.8 IS II. And that's fine with me. Already own the RF 70-200.

Here's what I think after reading both sides. I find the lack of drop in filters, COMBINED with the lack of a hood with a door in it odd. It is odd in the sense that the 70-200 has the door in the hood (which I personally hate. It is taped shut on mine because it gets knocked loose just looking at it). But at the same time, I can't imagine even buying filters for this lens. But I do agree, a couple hundred is nothing in the drop of $10k.

I'm also shocked to hear so many people debate even using a hood. No way you're finding me with one of my L lenses without a hood unless its in a photographer pit and is a courtesy to remove it for other photogs working by me.

Is anyone sad to see the prime lens go at the 300mm focal length? Or does Canon see the EF mark II as perfection so they made this instead for RF?
 
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How about the fact I work with these lenses for a living and actually OWN the EF 300mm f/2.8L II. I'm sharing what literally every single motorsports photographer that actually knows what they're doing is going to say about it - we all use CPLs and we all use ND filters. They are essential items for (good) motorsports photography without any question at all.

Canon now describes this lens as an "Indoor Sports Lens" so it's clear to me they are away of this limitation.
Would you have purchased an RF version of your 300mm? Or were you staying put no matter what? Assuming you own an R body of course.
 
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We will. never know just how many ef50/1.4 were sold but Canon do know this. We do know that the EF50/1.4 wasn't a great lens though. Let's hope that an eventual replacement is better
IMHO, there are higher priorities than a series of 1.4 primes. So if I were to place a bet, I'd bet on 3rd party makers getting there way earlier than Canon.

But I agree with you that the old EF 50mm 1.4 was a mediocre lens at best. My copy was really bad, essentially unusable at 1.4. So I am not sure why people are clamoring for it. Yes Canon could spend the time and effort to design a modern one, but they haven't with the 50 1.8 and even some of the big whites... so there're no guarantees there.
 
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Cutting an opening is not the same as adding a door. The latter can be closed.

Is there such a thing as a carbon fiber 3D printer?
A door would obviously be better, but if it was a choice between having no hood at all, or having a hood with a cutout, the latter might be more appropriate for @LSXPhotog. And the opening could be taped over if/when needed. Far from an ideal solution, and not very pretty, but a perfectly usable workaround.

Sometimes excellent photos are made by people willing to "botch" their gear, e.g. most of the best macro-flash photos that I've seen have been taken with crude home-made snoots and reflectors.

I have no idea whether it's possible to 3D print carbon fibre, but I'm sure some suitable composite could be used.
 
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I'm also shocked to hear so many people debate even using a hood. No way you're finding me with one of my L lenses without a hood unless its in a photographer pit and is a courtesy to remove it for other photogs working by me.
Same here. I wouldn't contemplate using any of my lenses without a hood, and it amazes me that some people don't. A hood not only helps to protect the front element from dust and rain, it greatly reduces flare when shooting into bright light, and offers protection against minor knocks and bumps.
 
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What amazes me is seeing people out shooting with the hood on the lens, but mounted in reverse.
My wife used to do that with the old 100-400 EF. She had used the 100-400 I, which was a push-pull lens and liked to zoom that way. With the lens hood reversed on the II version, she could grab the hood and quickly zoom using push-pull. Worked for her. Taught me not to judge insignificant things like how people use or don't use hoods. Judge by the pictures they get.
 
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My wife used to do that with the old 100-400 EF. She had used the 100-400 I, which was a push-pull lens and liked to zoom that way. With the lens hood reversed on the II version, she could grab the hood and quickly zoom using push-pull. Worked for her. Taught me not to judge insignificant things like how people use or don't use hoods. Judge by the pictures they get.
With long lenses such as my RF100-500, or the 800/11 (that I've just sold), instead of supporting the lens in the traditional way by cupping the barrel mid-way, I grip the hood with my left hand, with fingers gripping the inside of the hood. It's a tip I picked up from ace bird photographer Jan Wegener. With most hoods, if you grip them this way, your fingers don't intrude into the frame. It makes the set-up much more stable.
 
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The Fotodiox filters that I use with my Wonderpana system (front filter setup for my TS-E 17) are 145mm threaded. I have the 10-stop ND and CPL, but they make a UV version. They also have an XL system for the 11-24/4 that uses 186mm threaded filters.

112mm is the largest filter available from B+W, though.
Thank you for correcting me. I typically use B+W filters and that is the largest one they manufacture. I learned something today.
 
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Thank you for correcting me. I typically use B+W filters and that is the largest one they manufacture. I learned something today.
I also use B+W, except for the aforementioned Wonderpana 145 setup. I likely no longer need that, the drop-in adapter is much more convenient. I’ll likely hang onto it in case there’s a compelling RF TS lens that ends up taking those filters, e.g., the rumored 14mm.
 
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