how does aperture affect noise?

Started Apr 11, 2014 | Questions thread
ForumParentFirstPreviousNextNext unread
Flat view
fastHID
Contributing MemberPosts: 616Gear list
Like?
how does aperture affect noise?
Apr 11, 2014

I did some HDR work on shots taken in a museum that was fairly dark, and noticed more noise in the underexposed areas with my 3 bracketed images shot at f5.6 as compared to less grainy and noisy image from 3 shots done at f8. Bracketed was 0,-2,+2EV.

Equipment was Canon 70D with Sigma 8-16mm set at 8mm. I'm puzzled. I would have thought shooting at f5.6 with shorter exposures would have been less noisy than the longer exposures needed at f/8.

I repeated this in a different shot, and found the same result. Why would greater aperture cause more noise, what is the reason?

 fastHID's gear list:fastHID's gear list
Canon EOS 70D Canon EF-S 18-135mm f/3.5-5.6 IS STM +1 more
ANSWER:
This question has not been answered yet.
Canon EOS 70D
If you believe there are incorrect tags, please send us this post using our feedback form.
ForumParentFirstPreviousNextNext unread
Flat view
Post (hide subjects)Posted by
ForumParentFirstPreviousNextNext unread
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark post MMy threads
Color scheme? Blue / Yellow