Canon EOS R5 Unite and Discuss!

My meike adapter should be here today, and it is weather sealed unlike the viltrox and it doesn't seem to get the negative reviews of the viltrox.

Jeff USN Photog 72-76 wrote in post #19122563
Dumb question, but why instead of an EF-S lens, wouldn't you just shoot with an EF lens and then crop to 1.6? Wouldn't it be the same thing?.

Since I originally inquired about EF-S glass on the R5, I'll chime in. For me, it's simple, I don't have EF glass on the wide end, but do have some good EF-S glass. Coming from a 7D2, when shooting wider, I could (potentially) get all the benefits of the R5 and end up with a file very close to what I get today from the 7D2.

ct1co2 wrote in post #19122600
Since I originally inquired about EF-S glass on the R5, I'll chime in. For me, it's simple, I don't have EF glass on the wide end, but do have some good EF-S glass. Coming from a 7D2, when shooting wider, I could (potentially) get all the benefits of the R5 and end up with a file very close to what I get today from the 7D2.

Same here. Love my 10-22. Not a very popular option, but it works great for me if I can keep my toes out of the picture.

The 55-250 STM lens is very good and would be a lightweight option on the R5.

TeamSpeed wrote in post #19122605
The 55-250 STM lens is very good and would be a lightweight option on the R5.

You're gettin' the idea. Got that one too. LOL

TeamSpeed wrote in post #19122605
The 55-250 STM lens is very good and would be a lightweight option on the R5.

My Sigma 18-35 shines on the M50, and hoping it would do the same on an R5.

Jeff USN Photog 72-76 wrote in post #19122563
Dumb question, but why instead of an EF-S lens, wouldn't you just shoot with an EF lens and then crop to 1.6? Wouldn't it be the same thing?

Of course I have a Sigma 18-300 that is plenty sharp on my 90D and 7D2, nothing quite like that (the 28-300 EF is big and expensive) I use it as a walk-about lens when I can get it back from my son.

- Because you might happen to already have some cool EF-S lenses.
- Dealing with those smaller files v. 45MP files.
- 18-135mm EF-S
- 10-22mm EF-S
- Just more options and flexibility of the camera overall.
- One of the things I love about the EOS-R is I can put ANY lens on it!

Most often I would want all 45MP, but for some it might be handy with an EF-S to pretty much be getting the file size of an R6.

CyberDyneSystems wrote in post #19122664
- Because you might happen to already have some cool EF-S lenses.
- Dealing with those smaller files v. 45MP files.
- 18-135mm EF-S
- Just more options and flexibility of the camera overall.

Most often I would want all 45MP, but for some it might be handy with an EF-S to pretty much be getting the file size of an R6.

I'm still confused about the ISO performance on a cropped file out of the camera.

I've sen some incredible high ISO photo even at 51000 ISO that looked clean. So what happens when an EF-S lens is used? Will the sensor still produce super clean images at higher ISO or will they degrade?

CyberDyneSystems wrote in post #19122664
- Because you might happen to already have some cool EF-S lenses.
- Dealing with those smaller files v. 45MP files.
- 18-135mm EF-S
- 10-22mm EF-S
- Just more options and flexibility of the camera overall.
- One of the things I love about the EOS-R is I can put ANY lens on it!

Most often I would want all 45MP, but for some it might be handy with an EF-S to pretty much be getting the file size of an R6.

Enabling the 1.6 crop mode will also reduce the filesize.

ct1co2 wrote in post #19122610
My Sigma 18-35 shines on the M50, and hoping it would do the same on an R5.

I used to use that lens @35mm on my 6D for astro, especially panoramas. A bit soft and dark at the extreme edges but those were always cropped out in panoramas and are also the areas that most lenses suffer from coma anyway.

I sold it because I could never trust the focusing when in combo with the 7Dii. Shame, because it would have been great on my R and R5 (if it ever arrives).

CyberDyneSystems wrote in post #19122664
- Because you might happen to already have some cool EF-S lenses.
- Dealing with those smaller files v. 45MP files.
- 18-135mm EF-S
- 10-22mm EF-S
- Just more options and flexibility of the camera overall.
- One of the things I love about the EOS-R is I can put ANY lens on it!

Most often I would want all 45MP, but for some it might be handy with an EF-S to pretty much be getting the file size of an R6.

Thanks.

I do have a bunch of good EF-S lenses including the Sigma 18-300 which my copy is a good sharp lens

i-G12 wrote in post #19122666
I'm still confused about the ISO performance on a cropped file out of the camera.

I've sen some incredible high ISO photo even at 51000 ISO that looked clean. So what happens when an EF-S lens is used? Will the sensor still produce super clean images at higher ISO or will they degrade?

When an EF-S lens is used, the camera just records the center 17 MP of the sensor. So those 17 megapixels are native pixels (ie, the high quality that you've seen). The remaining 28 MP are thrown away.

LJ3Jim wrote in post #19122689
When an EF-S lens is used, the camera just records the center 17 MP of the sensor. So those 17 megapixels are native pixels (ie, the high quality that you've seen). The remaining 28 MP are thrown away.

Thanks.

Yo Canon...TAKE MY MONEY.

i-G12 wrote in post #19122666
I'm still confused about the ISO performance on a cropped file out of the camera.

I've sen some incredible high ISO photo even at 51000 ISO that looked clean. So what happens when an EF-S lens is used? Will the sensor still produce super clean images at higher ISO or will they degrade?

On a per pixel level, @ 100% measured noise should be the same.


...but resolution = lower perceived noise.

ie Lets assume (might not be actually true) that 7D2 and 5D-S have exactly the same noise when you look at the same subject viewed at 100% crop.
but when you look at the entire image with both framed to achieve the same overall image, the massive addition of 30 million more pixels comprising that image will reduce the perceived noise dramatically.

Measurement is the same, but results to our eyes is far different. That's using apples to apples, like we would be with the R5 and crop from within it. (A 1.6 crop from the 5DS happens to be 20MP just like the 7D2. It's speculated, and I believe it to be true, that the 7D2's actual sensor is a 1.6x sized piece of the same stuff that makes a 5Ds sensor.)


In a famous apples to oranges we can see similar results.
When the 1D MkII was out it was tested by the makers of "The Corpse Bride" to be the DSLR with the lowest noise of any camera tested.
Relatively large APS-H sensor with only 8.5 MP.

So it measures with testing to have the lowest noise,. The then current 1DS Mark II with it's FF 16 mp sensor was denser and made more noise.
however in final printed image, this was often not the case. The extra detail could often result in a final printed image that appeared to be less noisy.

Anyway, I am not arguing that the 1.6 from the R5 will look as good as the FF image, it won't it will be missing nearly 30MP of image detail! But it will look better than any APS-C I've shot to date.

tommykjensen wrote in post #19122667
Enabling the 1.6 crop mode will also reduce the filesize.

Exactly!

( I think that was point 2. )