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

dcm

Good or bad - it's not the gear.
Apr 18, 2013
819
167
Regarding the RF 100mm -500mm lens, according to Gordon at CameraLabs, here is the breakdown of apertures across the zoom range. Not too disappointing:
  1. f/4.5: 100mm - 151mm
  2. f/5.0: 152mm - 254mm
  3. f/5.6: 255mm - 363mm
  4. f/6.3: 364mm - 472mm
  5. f/7.1: 473mm - 500mm

It would sure be nice if they had a lockout at 473mm...I'd give up a tiny bit of range for not having to worry about losing 1/3 stop.
I guess it all depends on why you want to limit yourself to f/5.6.

You can just monitor the f stop through the viewfinder as you zoom. When you go above your max preferred f stop you can just back it off a little bit. This approach works for any chosen f stop you don’t want to exceed on any lens, mirrorless or not. This can be done easily by setting the f stop to f/5.6 before you zoom, and back off when it changes to f6.3. You could apply this method to the EF 100-400L II if you didn’t want to go above f/5.0. You are unlikely to notice the 1/3 stop change in most cases as others have noted. This has been my experience with the M series 55-200, 18-150, and 15-45 that all go to 6.3 at the long end.

Changing the exposure level increments to 1/2 stops to prolong the f/5.6 range as has been suggested. It just takes a bit longer to switch since the next increment is 6.7 instead of 6.3. On the EF-M 55-200 this extends the 5.6 range from about 150mm to 190mm. But the EV level metered is still the same so it decreases the shutter speed as you zoom or you’d be underexposing by a little bit in the extended range. In Av mode the shutter speed now changes at 150 to account for the EV change. So, have you gained anything? You really aren’t letting any more light in by prolonging f/5.6, that’s just physics.

The same thing happens on the 100-400L II. At 1/3 stops, the f stops are f/4.5 from 100-135, f/5.0 from 135-300, and f/5.6 from 300-400. Switching to 1/2 stops gives me f4.5 from 100-300 and f5.6 from 300-400. Extending the f/4.5 range may be tempting, but you just get a wider range of shutter speeds and ISO in this mode because it hasn’t changed the amount of light hitting the sensor. It only affects the settings the camera can choose to properly expose it.
 

dcm

Good or bad - it's not the gear.
Apr 18, 2013
819
167
Are you serious? Do not stop down... like in pinhole cameras? o_O
Actually, a lot like fixed aperture spotting scopes and telescopes, but with auto focus and image stabilization. Now you don’t have to mess with a mount adapter to attach a scope to your camera.
 
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koenkooi

EOS R
Feb 25, 2015
1,154
944
[..]Changing the exposure level increments to 1/2 stops to prolong the f/5.6 range as has been suggested. It just takes a bit longer to switch since the next increment is 6.7 instead of 6.3.[..]
I don't think switching to 1/2 stops actually changes the physical aperture size at 400mm, it only changes the number you see on screen and in the EXIF.

Placebo effect is a thing, so it might actually work for some people :)
 
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Eclipsed

EOS M6 Mark II
Apr 30, 2020
98
87
Regarding the RF 100mm -500mm lens, according to Gordon at CameraLabs, here is the breakdown of apertures across the zoom range. Not too disappointing:
  1. f/4.5: 100mm - 151mm
  2. f/5.0: 152mm - 254mm
  3. f/5.6: 255mm - 363mm
  4. f/6.3: 364mm - 472mm
  5. f/7.1: 473mm - 500mm

It would sure be nice if they had a lockout at 473mm...I'd give up a tiny bit of range for not having to worry about losing 1/3 stop.
These are presumably the displayed apertures and not actual apertures, which undoubtedly change as a continuous function of focal length.
 

jolyonralph

EOS R5 Mark II
Aug 25, 2015
1,298
625
London, UK
www.everyothershot.com
Canon states that the R5 and R6 allow powering over USB-PD, so you can plug in a huge powerbank and it will use that and not really drain the battery in the camera.
Where did you see this? I can't see anything in any of the official specs that say anything about this - only that you can charge the battery with a USB PD charger as before on the EOS R.

One word of caution, the new LP-E6NH batteries do work in the current EOS R but cannot be charged in-camera. Only the LP-E6N batteries can be charged inside the EOS R!
 

koenkooi

EOS R
Feb 25, 2015
1,154
944
Where did you see this? I can't see anything in any of the official specs that say anything about this - only that you can charge the battery with a USB PD charger as before on the EOS R.
I've only heard it being said during the presentations, "Charging and powering". Let's hope the manuals get published this week!

One word of caution, the new LP-E6NH batteries do work in the current EOS R but cannot be charged in-camera. Only the LP-E6N batteries can be charged inside the EOS R!
So glad my RP used LP-E17s which I can share with my M6II :)
 
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SteveC

R5
Sep 3, 2019
1,070
839
So glad my RP used LP-E17s which I can share with my M6II :)
I don't have an RP but that's one aspect of it that tempts me a lot--I have two other cameras that both use that battery. So if I bought one as a backup, I don't even need to think about buying spare batteries for it.