I recently got the Canon EF 24-105mm f3.5/5.6 IS STM lens,
I was undecided but having now tried out the f4 ‘L’ incarnation there’s really nothing in it! In
fact I prefer the look and also the handling of the variable aperture STM one.
Considering the Canon 6D is good in low light the smaller aperture at longer
focal lengths is irrelevant, I can put the 6D on a 1000 iso in dull light such
as today 20/12/2024, stop it down to f11 at the long end 105mm and it looks sharp across the frame, and very
sharp where you actually focus at. (I wouldn’t go any more than f11 due to the
diffraction effect when smaller apertures can start having a detrimental
effect)
If I’m up close and personal as I usually am when doing street photography... and its dull/overcast I can always pop my portable flash on, as I did with the above image of a street portrait in Doncaster, South Yorkshire, UK. @ ISO 100, f5, 1/60s, direct flash, taken with said Canon EF 24-105mm IS STM variable aperture lens @ 35mm focal length on the Canon 6D. An overlooked, underrated lens, whereas in reality it’s a solid performer with great optics.
The benefits IMO of the variable aperture one far outweigh
any advantage of the constant f4, indeed if there are any advantages? Better
build quality for sure on the f4 but the other one isn’t going to fall apart on
you, it’s not built like a kid’s toy! One of the main advantages of the ‘L’
lenses are the build quality and weather sealing, and is where a lot of the
extra cost goes, great if you photograph in torrential rain or thunderstorms,
but I’m a bit of a fair-weather photographer I like a bit of sunlight.
In fact my reliable sources tell me this lens performs
better with the new Canon mirror less cameras than both the constant f4 AND the
newer f4 mk2 model! There’s a lot of snobbery
in the photography world, “photographers” more into the equipment than actual
photography (and don’t the manufacturers know it!) many “photographers” would
look down their noses at the “old” equipment I prefer and choose to use over
mirror less, etc. Reality check… the only camera that really matters (even more than a Leica 😀) is the one
in your head! That’s where images are really made, sometimes I even construct
an image in my head than go out and make it happen. The camera is just a tool
in-between you and your vision, creativity and the subject.