Is light gathering at fast aperature constant despite stopping down?

Started 4 weeks ago | Discussions thread
ForumParentFirstPrevious
Flat view
Thinh28 Regular Member • Posts: 142
Is light gathering at fast aperature constant despite stopping down?

As stated in title. For example if I bought a 35/1.4 lens vs a 35/1.8 lens. If I shoot photos with both at f1.8, will the 1.4 lens allow better low light (and thus allow me to use better iso/faster shutter speed?)

Mainly asking because I shoot alot of candid family shots indoors at low light. It has been suggested to look into a quick lens like the 1.4 to get the extra 2/3rd stop. I want to be sure this extra 2/3 stop improvement remains despite shooting at the same aperature (I usually shoot 1.8 to 2.8 indoors).

Also, does this 2/3rd stop improvement translate equally for both of and apsc.

Thanks in advance!

 Thinh28's gear list:Thinh28's gear list
Canon EOS 80D Canon EF 50mm f/1.8 II Canon EF 85mm f/1.8 USM Canon EF-S 18-135mm F3.5-5.6 IS USM Canon 70-300 F4-5.6 IS II
ForumParentFirstPrevious
Flat view
ForumParentFirstPrevious
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark MMy threads
Color scheme? Blue / Yellow