RF 15-35 vs 24-70 at 24-35mm

TonyG

R5
Oct 17, 2022
112
121
Toronto
You can do some comparison is image quality here:
You can compare the two lenses at the same focal lengths and it will give you a bit of an idea between then two.
In my opinion the 24-70 is a little sharper at 2.8 but they are pretty much the same at 4.0.
This also requires a lot of pixel peeping so it’s up to you if the difference is negligible.
 
Upvote 0
Jul 21, 2010
31,094
12,857
You can do some comparison is image quality here:
You can compare the two lenses at the same focal lengths and it will give you a bit of an idea between then two.
In my opinion the 24-70 is a little sharper at 2.8 but they are pretty much the same at 4.0.
This also requires a lot of pixel peeping so it’s up to you if the difference is negligible.
Worth noting that the link you posted compares the RF 15-35/2.8 on the R5 with the EF 24-70/2.8 (Mk I) on the 1DsIII. Probably better (and what the OP asked about) is comparing to the RF 24-70/2.8. Use the links from @docsmith above that are the appropriate comparison (with the caveats below about TDP ISO12233-type testing).

Also important to keep in mind that for most lenses, Bryan/TDP tests and reports on a single copy of each lens. In a few cases, usually with lenses where he expects better performance, he tests multiple copies. For example, if you select the EF 24-70/2.8L II from the list and set the camera to the 1DsIII, you'll see another drop down where he tested four copies because the first two were defective. In other cases, e.g. the EF-M 18-150 for which he also received a poor copy, he just replaced the poor results with the better ones from the second copy. But in most cases, it's n=1 and Roger Cicala (Lensrentals) has written many blog posts about the copy variation that occurs even in high-end lenses.

Testing a single copy is a common practice among most review sites, and can lead to erroneous conclusions. @eoskai you might consider just buying a 15-35/2.8L from a reputable dealer with a proper return policy, testing it yourself against your 24-70/2.8 and making a decision.
 
  • Like
Reactions: 2 users
Upvote 0

TonyG

R5
Oct 17, 2022
112
121
Toronto
Worth noting that the link you posted compares the RF 15-35/2.8 on the R5 with the EF 24-70/2.8 (Mk I) on the 1DsIII. Probably better (and what the OP asked about) is comparing to the RF 24-70/2.8. Use the links from @docsmith above that are the appropriate comparison (with the caveats below about TDP ISO12233-type testing).

My bad, I had the RF 24-70 selected when I gave my pixel peeping opinion, but I guess the link got copied wrong? Either way pretty sure since the selections are there the OP would have noticed it and changed it, or compared any other lens he might be interested in.

Also important to keep in mind that for most lenses, Bryan/TDP tests and reports on a single copy of each lens. In a few cases, usually with lenses where he expects better performance, he tests multiple copies. For example, if you select the EF 24-70/2.8L II from the list and set the camera to the 1DsIII, you'll see another drop down where he tested four copies because the first two were defective. In other cases, e.g. the EF-M 18-150 for which he also received a poor copy, he just replaced the poor results with the better ones from the second copy. But in most cases, it's n=1 and Roger Cicala (Lensrentals) has written many blog posts about the copy variation that occurs even in high-end lenses.

Maybe a good suggestion to allow for more degrees of freedom on a single lens sample would be to take multiple captures to make sure there is no variable in the images from the body / shutter etc. Does he let auto focus lock onto the test card or does he do it with manual focus?
 
Upvote 0
Jul 21, 2010
31,094
12,857
Maybe a good suggestion to allow for more degrees of freedom on a single lens sample would be to take multiple captures to make sure there is no variable in the images from the body / shutter etc. Does he let auto focus lock onto the test card or does he do it with manual focus?
 
  • Like
Reactions: 1 user
Upvote 0

Ozarker

Love, joy, and peace to all of good will.
CR Pro
Jan 28, 2015
5,933
4,336
The Ozarks
Quick question…

How does the 15-35 RF compare to the 24-70 RF at the focal range of 24-35mm.

I have the 50mm 1.2, 24-70, and the 70-200, but I’m primarily a prime shooter. If the 15-35 is better at those ranges, then I’ll drop the 24-70 and buy the 85mm 1.2 so the setup would be:

15-35mm 2.8
50mm 1.2
85mm 1.2
70-200mm 2.8
I like your setup plan a lot. I've not used the RF zooms you list, so I can't comment on that. It looks like you're building an awesome lens kit.

I've owned the RF 50, 85 f/1.2 and the RF 28-70. If I could do it today:
RF 35 f/1.2
RF 28-70 f/2
RF 50 F1.2
RF 85 F1.2
RF 70-135 f/2 if it existed, otherwise RF135

I could be perfectly happy with what you list, though I would miss a 135mm. Great list. :)
 
Upvote 0
I like your setup plan a lot. I've not used the RF zooms you list, so I can't comment on that. It looks like you're building an awesome lens kit.

I've owned the RF 50, 85 f/1.2 and the RF 28-70. If I could do it today:
RF 35 f/1.2
RF 28-70 f/2
RF 50 F1.2
RF 85 F1.2
RF 70-135 f/2 if it existed, otherwise RF135

I could be perfectly happy with what you list, though I would miss a 135mm. Great list. :)
Thanks!!

Oh I only mentioned the stuff that’s out.. if I could have my perfect RF kit it would be:

14 or 16mm 1.4
24mm 1.2
35mm 1.2
50mm 1.2
85mm 1.2
135mm 1.8

I wouldn’t even use the zooms if I had those primes. Those primes + crop mode would cover me for everything I do, stills and video.
 
  • Like
Reactions: 1 users
Upvote 0