Why do you buy fast lenses/cameras?

Started 3 months ago | Polls thread
OP Lee Jay Forum Pro • Posts: 54,792
Re: nope

Michael Fryd wrote:

tko wrote:

trungtran wrote:

If i want better IQ in the low light, i use a bigger sensor

Bigger sensor don't gather more light, but bigger lenses do.

In terms of the lens, the angle of view and aperture diameter are the two main factors in how much light you gather. Generally, for a given angle of view, it's easier to find a lens with a large aperture for larger sensor cameras.

Correct, and the reason for that is larger sensors require longer focal length for the same angle of view, and longer focal length means slower f-stop for the same aperture diameter.  Slower f-stops are easy to design and correct, with the limiting factor the fact that you can't scale the refractive index of glass.

-- hide signature --

Lee Jay

 Lee Jay's gear list:Lee Jay's gear list
Canon IXUS 310 HS Canon PowerShot SX50 HS Canon EOS 7D Mark II Canon EF 70-200mm F2.8L IS II USM Canon EF 8-15mm f/4L Fisheye USM +23 more
Post (hide subjects) Posted by
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark MMy threads
Color scheme? Blue / Yellow