RF 24-105 f4-7.1 vs RF 24-70 f2.8 in daylight

[Salamander]

I currently have the R6ii with the RF 24-105 f4-7.1 lens. I’m considering getting the RF 24-70 f2.8. I know the 2.8 will be better in low light. I’m curious if there is much difference in the quality of pictures taken outside in daylight, particularly as you zoom towards 70mm.

 

[neuroanatomist]

Daylight, so maybe say, "F/8 and be there." I presume you mean the RF 24-70/2.8L IS USM. In the center of the frame at 70mm f/8, the L-series lens is a little sharper, away from the center of the frame the L lens is noticeably better.

https://www.the-digital-picture.com/Reviews/ISO-12233-Sample-Crops.aspx?Lens=1504&Camera=1508&Sample=0&FLI=3&API=3&LensComp=1415&CameraComp=1508&SampleComp=0&FLIComp=3&APIComp=4

If by some chance you mean the non-L 28-70/2.8 IS STM, you can compare that lens using the above tool as well, and run through more focal lengths and apertures if you like.

 

[Michael Clark]

I currently have the R6ii with the RF 24-105 f4-7.1 lens. I’m considering getting the RF 24-70 f2.8. I know the 2.8 will be better in low light. I’m curious if there is much difference in the quality of pictures taken outside in daylight, particularly as you zoom towards 70mm.

The constant aperture f/2.8 obviously also gives you the option to shoot at wider apertures in brighter light if your camera can shorten exposure times enough to compensate or if you use Neutral Density filters. The minimum exposure time of the R6 Mark II is 1/8,000 with mechanical shutter and 1/16,000 with electronic shutter. "Sunny 16" gives you ISO 100, f/2.8 at 1/6,400.

 

[Salamander]

The constant aperture f/2.8 obviously also gives you the option to shoot at wider apertures in brighter light if your camera can shorten exposure times enough to compensate or if you use Neutral Density filters. The minimum exposure time of the R6 Mark II is 1/8,000 with mechanical shutter and 1/16,000 with electronic shutter. "Sunny 16" gives you ISO 100, f/2.8 at 1/6,400.

I thought I understood the sunny 16 rule, but apparently not. My understanding is if the ISO is 100 then the shutter speed should be 1/100, not 1/6,400. I’m new to this, so I need more help understanding this.

 

[AlanF]

I thought I understood the sunny 16 rule, but apparently not. My understanding is if the ISO is 100 then the shutter speed should be 1/100, not 1/6,400. I’m new to this, so I need more help understanding this.

The sunny 16 rule is that at iso 100 you need 1/100s at f/16. So, at f/11 you need 1/200s. f/8 1/400s etc etc to 1/3200s at f/2.8. (Not 1/6400s).

 

[Salamander]

The sunny 16 rule is that at iso 100 you need 1/100s at f/16. So, at f/11 you need 1/200s. f/8 1/400s etc etc to 1/3200s at f/2.8. (Not 1/6400s).

Thanks. I found a handy chart that further explains it. It’s going to take me some time and practice to get handy at this.