24-70L vs 24-105L @ f4

I don't need f2.8. However, I do need good performance at f4.

Some lenses don't perform too well wide open.

So, how do these two lenses compare at f4 with a full frame camera?

The 70-105mm range is honestly not important to me (I have primes covering that range)... but the IS is a significant variable because I do a lot of handheld video work.

So, anyone want to weigh in on their thoughts about these two lenses at f4?

The 24-70 @ F4 will perform better than the 24-105 @ F4. Same thing as saying the 50L at 1.8 will be sharper than the 50 1.4 at 1.8.

Make sense?

cassidyphuey wrote in post #12803014
The 24-70 @ F4 will perform better than the 24-105 @ F4. Same thing as saying the 50L at 1.8 will be sharper than the 50 1.4 at 1.8.

Make sense?

I know this is usually the case, but sometimes lenses perform really really well wide open. The 70-200 f2.8 II comes to mind, for instance.

But in the cases between these two lenses, there is a significant different at f4?

HansSteinert wrote in post #12803052
I know this is usually the case, but sometimes lenses perform really really well wide open. The 70-200 f2.8 II comes to mind, for instance.

But in the cases between these two lenses, there is a significant different at f4?

Well in my case, yes, there was a difference in comparison when I had the 24-105. The 24-70 was sharper at F4.

Had both lenses and sold one because one offered what I wanted more of. At f4. And yes it was the 24-70, not by a lot but when I printed two similar pics at 16x20 size the blur showed more than I thought acceptable

Anybody else want to chime in?

I tested 24-105 and didn't buy it. Bought the 24-70 instead. Sharpness wasn't an issue though... even wide open. Mainly I needed f2.8 minimum for a "standard" zoom. I liked the smaller size and lower weight of the 24-105 though. OTOH, the 24-105 vignettes pretty heavily in the corners at 24mm (can largely be corrected with Peripheral Illumination or in post processing). Heck the 28-135 IS at one quarter the price is virtually equal in image quality to either of the L-series, vignettes a lot less than the 24-105 at the wide end, but is not as well made or sealed, and of course is slower at f3.5-5.6.

Overall you'd have a hard time telling apart 11x14 or 13x19 prints made from images made with each of these lenses. The difference between them are mostly things other than IQ.