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FORUMS Sample Photo Archives Lens Sample Photo Archive 
Thread started 13 Aug 2020 (Thursday) 20:47
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Canon RF 800mm f/11 IS STM

 
Capn ­ Jack
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Apr 15, 2021 20:12 |  #331

John Sheehy wrote in post #19223244 (external link)
The question, I think, is "compared to what?". If you use 800/11 instead of 800/5.6, then you get more diffraction, more noise, and less background blur, AOTBE, just as if you took the same shot with an 800/5.6 lens, one at 5.6 and another at f/11 with the same shutter speed. If you use 800/11 instead of cropping from from 400/5.6, however, all the analog qualities are the same, the only differences being that the 800mm puts 4x as many pixels-on subject, which resolves the subject better. Yes, the diffraction blur, as measured in pixels, has twice the radius for f/11, but the subject is also twice as tall and wide, so the net effect of diffraction blur size relative to subject size is the same; you have the same analog subject-normalized diffraction. By sampling the subject with 4x as many pixels, though, the coarseness of the color filter array and the radius of the anti-alias filter halve in each dimension, relative to the size of the subject. What you get is pretty much the same as if you had used 400/5.6 on a a 20MP m43 camera, except that the RF800/11 seems to have nearly zero aberration, based on how impressed many people are with it. I don't know if the 400mm lenses typically used on m43 cameras are as low in aberration.

It's the same thing when you put TCs on the already "slow" 800/11, the diffraction gets larger, but so does the subject, for a net zero change in their relationship, ISO goes higher, but the subject is larger, making up for it, and the coarseness of the CFA and the radius of the AA filter both get even smaller and have less negative effect.

How does the ISO affect the diffraction?

John Sheehy wrote in post #19223244 (external link)
There is no generic loss in subject quality with maintaining the same entrance pupil (71mm in this case) with longer and slower options, when compared to cropping and shooting from the same distance; what you have to watch out for is loss of AF ability, darker sensor dirt, and any added aberrations from the TC (which are probably quite small with Canon's latest TCs). High-contrast edges with lighting high in invisible light may blur more with TCs, too, as they are optimized for visible light.

If you also get farther from the subject with a TC, your entrance pupil stays the same size, but it looks smaller to the subject because you are farther, which means more subject-level diffraction and noise, and your background gets less blurred relative to subject size, because it is less out of focus, plus the entrance pupil also looks smaller to the background, even if not as much smaller as it is to the subject. Also, when you get farther from the subject, the minimum usable shutter speed to keep motion blur small relative to subject size also increases, increasing subject-level noise.

When you don't get farther away, but use the TC as an alternative to cropping, you can increase shutter speed if you want, but it isn't as necessary as it is with being farther away, because subject-normalized camera motion blur has nothing to do with focal length, but rather, with distance. Think of a laser pointer attached to a long lens and pointed at the center of the frame; how much it moves around on a subject has nothing to with focal length, and everything to do with distance. So, even if you don't up your shutter speed for an added TC, you won't get subject captures worse than without the TC, and on the fraction of frames where there is the least camera/lens motion, you will get subject capture that is more detailed.

Please explain the highlighted text, what invisible light do you mean? If the TC is optimized for visible light (as is the lens used for most of our cameras), "invisible light" shouldn't be a factor.




  
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Archibald
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Post edited 3 months ago by Archibald.
     
Apr 23, 2021 22:00 |  #332

A white pelican that managed to overwinter here on Frank Lake. (It was injured and couldn't fly.) Tough old bird. This is a severe crop.

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Shortaction
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Apr 26, 2021 19:10 |  #333

Some different examples. First one shot with the EOS R in 1.6 crop mode.
2nd one is EOS R Full res.
One in the next post is the EOS R6 Full Res


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Shortaction
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Apr 26, 2021 19:12 |  #334


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Apr 27, 2021 05:32 |  #335


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Canon EOS R5,
Canon RF 800 , Canon RF 24-105mm f/4L IS USM, Canon EF 100-400mm f/4.5-5.6L IS II USM

  
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Snydremark
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Apr 27, 2021 11:32 |  #336

biggles2002 wrote in post #19228347 (external link)
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That's just a great image all the way around :)


- Eric S.: My Birds/Wildlife (external link) (7D MkII/5D IV, Canon 10-22 f/3.5-4.5, Canon 24-105L f/4 IS, Canon 70-200L f/2.8 IS MkII, Canon 100-400L f/4.5-5.6 IS I/II)
"The easiest way to improve your photos is to adjust the loose nut between the shutter release and the ground."

  
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Apr 28, 2021 14:52 |  #337

Canada Goose on the nest.

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Apr 28, 2021 14:59 |  #338

biggles2002 wrote in post #19228347 (external link)
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Brilliant photo! And pretty damn good for such a high ISO




  
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Apr 29, 2021 06:04 |  #339

PSteven wrote in post #19229032 (external link)
Brilliant photo! And pretty damn good for such a high ISO

There is a challenge with that f11 aperture for sure but you got a lot of help with that awesome IBIS + lens IS.


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DTBaan
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May 10, 2021 15:50 |  #340

Levina de Ruijter wrote in post #19156397 (external link)
Took the lens out today to see how it would do with songbirds. It did very well. Although a bit much lens for the park... :-P
Great tit
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Not a songbird but always fun to shoot: Rose-ringed parakeet
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Stalking the stalker. These do look good at f11 :)




  
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Levina ­ de ­ Ruijter
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May 10, 2021 16:00 |  #341

DTBaan wrote in post #19233974 (external link)
Stalking the stalker. These do look good at f11 :)

Thanks, Baan!
I was just experimenting, see how it would do on these little songbirds.
I bought the lens for waders out in the field. But this lens is more versatile than one might think!


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May 10, 2021 17:18 |  #342

A few cygnets.


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EOS R5 | EOS R | iPhone 12 Pro
RF 800mm F11 STM | RF 24-240mm USM | EF 100-400mm IS II | Sigma 150-600mm C
EF 70-200mm IS II | EF 85mm 1.8 | EF 50mm 1.8 STM | EF 35mm f/2 IS | EF 20mm 2.8

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Post edited 2 months ago by Levina de Ruijter with reason 'Corrected a typo...'.
     
May 11, 2021 15:21 |  #343

Shot a lifer yesterday: a Northern wheatear. He was not skittish at all and most comfortable with me being close. After a few shots with the RF 800/11 I decided to put the RF 1.4x TC on. This was handheld and it's not bad at all. But next time I will use a tripod.


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May 14, 2021 10:55 |  #344

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Canon EOS R6lCanon RF 24-105L| RF 50| RF 24-240| RF 800 and a bunch of Canon L lenses
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A1original
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May 14, 2021 11:12 |  #345


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Canon EOS R6lCanon RF 24-105L| RF 50| RF 24-240| RF 800 and a bunch of Canon L lenses
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Ira. “No one here gets out alive”

  
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Canon RF 800mm f/11 IS STM
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