24-70 or 24-105 for indoor flash

Will the 24-105 f4 do as good a job with indoor flash as the 24-70 f2.8

For what subjects, situations?

I'm struggling to see a relationship here.

For the most part yes, but the 24-70 does allow you to go to F/2.8 which allows you to use a wider aperture and less fill flash vs. available light, 1 full stop more than the 24-105. Flash will negate the benefit of the 24-105's IS to some degree. If you are shooting a lot indoors aperture matters and the larger and heavier 24-70 will probably be a better fit, but for a walk around lens the 24-105 can't be beat. Just depends on what you need and mostly shoot.

24-70L = pleasant creamy bokeh. It fails in reach compared to 24-105L

L.Morey wrote in post #11464529
Will the 24-105 f4 do as good a job with indoor flash as the 24-70 f2.8

i'd say the biggest difference is the 24-70L focusses better in low light but either would be fine.

ed rader

robtaylor22 wrote in post #11464592
For the most part yes, but the 24-70 does allow you to go to F/2.8 which allows you to use a wider aperture and less fill flash vs. available light...

The ratio of fill to available is dictated by the flash power, not the lens aperture.

AlanU wrote in post #11464617
24-70L = pleasant creamy bokeh. It fails in reach compared to 24-105L

ed rader wrote in post #11464621
i'd say the biggest difference is the 24-70L focusses better in low light but either would be fine.

ed rader

Help me out here - how do these relate to flash?

Yes but for a given shutter speed you can shoot in a 1 stop darker ambient with f/2.8 vs f/4. - provided the DOF works for you

xarqi wrote in post #11464628
The ratio of fill to available is dictated by the flash power, not the lens aperture.

i usually try to shoot f5.6ish with flash indoors.

ed rader

In some situations, the best lighting comes from bouncing the flash and allowing the bounced light to be the only light contributing to the exposure. In these situations, the faster lens doesn't help at all because it will need to be stopped down to make sure that none of that crappy orange light infects the nice clean light from the flash.

Ive shot at f8 with flash indoors with great/sharp results. With a 24-105.

I'd go with the 24-105L.

Frugal wrote in post #11464747
Yes but for a given shutter speed you can shoot in a 1 stop darker ambient with f/2.8 vs f/4. - provided the DOF works for you

But the point is moot once flash is involved. You can either drag the shutter or using a higher ISO to allow more ambient light to fill.

If the room is small I will usually light the whole room with the flash. In this case I typically use f/5.6 or so and thus the lighter weight and greater range of the 24-105 is preferred.

In large rooms I will often gel the flash and drag the shutter. In this case I usually want f/2.8 to keep ISO and shutter speeds reasonable and so the 24-70 is preferred.