lilitalia wrote in post #17801503
Thank you, yes I also want the 35mm for indoors. Sometimes my 17-55 isn't great in low light with kids. Such a tough decision!
In low light, indoors, flash is the better answer. A fast prime gets you a little more light for the same settings, but really you will still be at higher ISO even with a faster prime, and it will still be difficult to focus accurately and quickly in truly low light like in a dark house. I used to do just fast primes inside at high ISO. I can shoot ISO 3200, 6400, 12800 no problem and get clean images. But frankly, flash and lighting is a far better tool for this job, and when I look back at snap shots of the kid around the house in poor light, I definitely appreciate my snaps that had lighting far more than my ones at ISO 12,800 and super wide aperture (though some are still quite nice).
I often shoot with manual focus indoors in low light, it's more accurate for me (plus I use a lot of manual glass). But I also use AF. AF fails if there just isn't enough light. So I bring the light. Or I turn on lights, and then stop them out with camera settings and expose the subject with lighting/flash.
Flash in general, when well used, is a lot more useful inside and makes typical in-door snap shots of family, friends, whatever, much nicer, than simply using a fast prime and high ISO.
Here's how spontaneous snap shots go in my house with cheap old gear, but specifically, using flash (note, not using flash directly, usually bounced off a wall or ceilling, or off camera and behind a small modifier on a stand... I keep them in my house in rooms for this purpose, I don't care how that looks because I like my "snap shots" later!).
Example, with a cheap 58mm F2 manual lens with a little fill flash in a dark house, against a back lit far window (flash was off camera, above and behind an umbrella on a stand):

IMAGE LINK: https://flic.kr/p/Bd3xhd
IMG_5998
by
Martin Wise
, on Flickr
Example, 35mm F2 in a dark house, but with a bounced flash off the opposite wall with no modifiers, was on camera:
IMAGE LINK: https://flic.kr/p/zNL7kG
225H7332_mark
by
Martin Wise
, on Flickr
Example, 85mm F1.4 in a dark house, with bounced flash on-camera off the ceiling:
IMAGE LINK: https://flic.kr/p/voVmxb
IMG_4450
by
Martin Wise
, on Flickr
Example, wide angle, doesn't matter what aperture, bounced flash (where flash duration becomes exposure duration, thus you can freeze motion), done with a simple bounced flash on-camera off the ceiling:
IMAGE LINK: https://flic.kr/p/rbDscb
IMG_3205
by
Martin Wise
, on Flickr
Very best,