Canon RF 300-600mm Update…. Again

Some people just need to vent their frustration or aggressiveness. A psychiatrist might help...
The psychiatrist could call the police. Forcing someone to spend 13 years getting electroshock therapy before escaping by making a ladder from plastic spoons and cross dressing in a nurse's uniform. This is not from my personal experience. Honest. I would not lie.
 
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If you have infinite money then sure, buy all Canon/Sony/Nikon glass. Or buy all Leica glass. Whatever floats your boat. But the reality is that when viewing a processed & printed photograph from a normal viewing distance, 99.999% of the population (if not 100%) won't be able to tell if you spent $2.5k on Canon glass or $250 on Viltrox glass. If you pixel peep, you can tell. So what's more important, the print or the pixel peeping?

This all circles back to the fact that the #1 most important part of photography is the skills of the person behind the equipment, not the brand on the front of it. The best rated lens or body matters not to the end product if the user doesn't know how to exploit the equipment to the max and have a good photographic eye, and in the case of sports, wildlife, and other action, have fast reflexes.

Personally, I don't care what brand other photographers use because that is either a personal decision or mandated, such as in the case with AP staff photographers who are supplied Sony by contract, or NASA astronauts who are given Nikon. Look at any pro sports photographer section and lots of Canon. All the photos made with these bodies and lenses that a released to the public are fantastic.

When I'm looking at someone else's photos I don't ask what equipment they used. What I'm curious about is focal length, exposure info, natural lighting condition, and technique if it's of a difficult subject.
 
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On the 2x extenders - I have both the RF and EF (somewhere!) but I can't mount the same lens in front of them so how would I compare, genuine question? Am I being dim?
Maybe just not adventurous enough... You need to get an EF-RF mount adapter (preferably a 3rd party one) and modify it by widening the opening so the protrusion of an RF extender can fit. Then you can use an EF lens and either mount an RF extender behind the adapter or an EF extender in front of it. Or both. I used a Commlite adapter because it's the one that starts with the widest opening.

Screenshot 2026-03-27 at 11.06.06 AM.png

That's how I tested RF vs. EF and various combinations of them with the EF 600/4 II. In this case, since I'm planning to test two copies of the RF 2x, I'll just use the 100-300/2.8.
 
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Maybe just not adventurous enough... You need to get an EF-RF mount adapter (preferably a 3rd party one) and modify it by widening the opening so the protrusion of an RF extender can fit. Then you can use an EF lens and either mount an RF extender behind the adapter or an EF extender in front of it. Or both. I used a Commlite adapter because it's the one that starts with the widest opening.

View attachment 228600

That's how I tested RF vs. EF and various combinations of them with the EF 600/4 II. In this case, since I'm planning to just test the two copies of the RF 2x, I'll just use the 100-300/2.8.
I remember that, pretty tempting :) But alas I now only have long RF lenses, the longest I can go with EF is 180mm (and as a third party lens it doesn't take native extenders anyhow).
 
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Maybe just not adventurous enough... You need to get an EF-RF mount adapter (preferably a 3rd party one) and modify it by widening the opening so the protrusion of an RF extender can fit. Then you can use an EF lens and either mount an RF extender behind the adapter or an EF extender in front of it. Or both. I used a Commlite adapter because it's the one that starts with the widest opening.

View attachment 228600

That's how I tested RF vs. EF and various combinations of them with the EF 600/4 II. In this case, since I'm planning to test two copies of the RF 2x, I'll just use the 100-300/2.8.
Haha — I remember the digital picture article on that. Loved the fun-ho attitude! 😎🛠️🪚
 
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On the 2x extenders - I have both the RF and EF (somewhere!) but I can't mount the same lens in front of them so how would I compare, genuine question? Am I being dim?
Do you have an extension tube? They often allow the extender protrusion to fit into a space pre-lens and the space is just air. That kills infinite focus but if you replicate filling the frame in each case you can make a good estimate.

Note that DLO for a lens + TC combo accounts for related factors (clarity, contrast, sharpness, distortion, and so forth) so if you don’t have profiles for any one of the setups then I suggest inspecting the images with DLO and corrections turned off for all setups compared. Just as a reminder for people making other comparisons.
 
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I still have EF II extenders and they still work great once you learn their needs. 😎

No judgement on anything that works for someone. If a turnip lens gets it done…
Well I meant more, I haven't any lenses they fit (apart from the MP-E, and using extenders with that is super niche).
Do you have an extension tube? They often allow the extender protrusion to fit into a space pre-lens and the space is just air. That kills infinite focus but if you replicate filling the frame in each case you can make a good estimate.
Not any more. I broke one, if I had any others they were stolen. I used to be very experimental but now I stick to what's practical and what works :)
 
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The psychiatrist could call the police. Forcing someone to spend 13 years getting electroshock therapy before escaping by making a ladder from plastic spoons and cross dressing in a nurse's uniform. This is not from my personal experience. Honest. I would not lie.
I have my doubts, very strong doubts! 🤔
 
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No, I just understand the market and the position of the R100 in it. You just want to prove that you’re an arrogant ass, and at least that’s one thing for which you’ve provided convincing evidence. So, well done?


This, from a slavering Sony fanboi. Oh, the irony. :ROFLMAO:
I have absolutely zero brand loyalty. Not only in the camera world but with any product. Brand loyalty is for suckers and fools. I'll buy whatever is best at any given time. I've owned & used Canon in the past. And Nikon. And Pentax. And Minolta. And Hasselblad. And Contax. And Olympus. (Oddly never an L mount camera, at least not yet.) Often several mounts at once. These days Sony, yes, but if Sony suddenly decided to lock their mount down and disallow 3rd party glass, I'd move to something else.

I do not understand why people like you not only put up with Canon's locked mount BS and yesteryear sensor tech, but defend the company for it. It's an absurd position to take.
 
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Sure, if all you do is take simple shots and view the whole image without cropping at a moderate size then most gear, including a smart phone, will be adequate in many cases. But, if you are working at the limit of needing very rapid, reliable AF and cropping greatly and then viewing, then you really see the difference between cheap optics and inferior AF compared with the top grade, and the inferior unacceptable. And what counts is not what appeals to 99.999% of the population but your own standards, which might overlap with the 99.999%.

By the way, your numbers are suspect. The remaining 0.001% of the population adds up to 82,000 people, and the estimates of the number of professional photographers ranges from 1 to 2.5 million, with 20-30 million serious prosumers. So, a figure of 97.5% of the population is a more realistic estimate of the population not being serious about quality.
I doubt most photographers would be able to accurately pick between first party & third party glass in a print from a normal viewing distance. Or which brand of camera was used.

99.999% is likely too low a number as it implies 1 in 100,000 people could reliably tell, and I do not think that is the case. If you put up 1000 photos taken with different cameras and lenses in a properly managed double-blind test, I doubt there is a single person on the planet who would be able to reliably pick out the camera & lens used for each photo. Experienced photographers could likely pick out the approximate focal length and aperture ("taken at somewhere between 400 and 800mm at a fairly wide aperture" type description) but not anything beyond that. There are too many factors to consider that are only known to the photographer and would not be shared in a double blind test.
 
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I doubt most photographers would be able to accurately pick between first party & third party glass in a print from a normal viewing distance. Or which brand of camera was used.

99.999% is likely too low a number as it implies 1 in 100,000 people could reliably tell, and I do not think that is the case. If you put up 1000 photos taken with different cameras and lenses in a properly managed double-blind test, I doubt there is a single person on the planet who would be able to reliably pick out the camera & lens used for each photo. Experienced photographers could likely pick out the approximate focal length and aperture ("taken at somewhere between 400 and 800mm at a fairly wide aperture" type description) but not anything beyond that. There are too many factors to consider that are only known to the photographer and would not be shared in a double blind test.
Please be honest. You didn't write about the general situation of identifying any camera and any lens combination but specifically a very low quality named manufacturers lens against a very high quality named one, namely:
If you have infinite money then sure, buy all Canon/Sony/Nikon glass. Or buy all Leica glass. Whatever floats your boat. But the reality is that when viewing a processed & printed photograph from a normal viewing distance, 99.999% of the population (if not 100%) won't be able to tell if you spent $2.5k on Canon glass or $250 on Viltrox glass. If you pixel peep, you can tell. So what's more important, the print or the pixel peeping?
 
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I do not understand why people like you not only put up with Canon's locked mount BS and yesteryear sensor tech, but defend the company for it. It's an absurd position to take.
Now you are being a troll on a canon forum.... and for what purpose?

Should I sell all my Canon gear and then rebuy Sony + 3rd party and lose money on the switch? Just because you say that I shouldn't put up with a closed ecosystem (for AF and only full frame)? Am I being absurd with my own money?
You will be telling me to switch from Apple to something else next!

Sony makes good sensors. Canon also makes good sensors.
In past, Sony had comparably great sensors but poor bodies compared to Canon's great bodies but older sensor tech. That isn't the case on either side now.
Good to have choice.
 
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