How does the f-number of camera lenses affect image area?

  • Thread starter Thread starter Gear300
  • Start date Start date
  • Tags Tags
    Camera Lenses
AI Thread Summary
The discussion centers on the relationship between the f-number of camera lenses and image area. It clarifies that the area of the image is proportional to the square of the image distance (q²), which contrasts with the initial assumption that it is proportional to q. Participants note that while the f-number affects image brightness, it does not influence the field of view. The distinction between image area and brightness in relation to the f-number is emphasized. Understanding these relationships is crucial for photographers when considering lens selection and image composition.
Gear300
Messages
1,209
Reaction score
9
I was reading on the f-number of lenses for cameras...somewhere in the text, they stated that the area of the image is proportional to q2, in which q is image distance. I figured the area to be proportional to q, but I don't really see it as q2...so how does this work out?
 
Science news on Phys.org
The f/# doesn't affect the field of view, so I'm not sure what you mean, exactly. The image *brightness* goes as the square of the f/#, but that's different.
 
Thread 'A quartet of epi-illumination methods'

Thread 'A quartet of epi-illumination methods'

Well, it took almost 20 years (!!!), but I finally obtained a set of epi-phase microscope objectives (Zeiss). The principles of epi-phase contrast is nearly identical to transillumination phase contrast, but the phase ring is a 1/8 wave retarder rather than a 1/4 wave retarder (because with epi-illumination, the light passes through the ring twice). This method was popular only for a very short period of time before epi-DIC (differential interference contrast) became widely available. So...
View full post »

Thread 'Effective absorption coefficient of gold nanoparticles'

I am currently undertaking a research internship where I am modelling the heating of silicon wafers with a 515 nm femtosecond laser. In order to increase the absorption of the laser into the oxide layer on top of the wafer it was suggested we use gold nanoparticles. I was tasked with modelling the optical properties of a 5nm gold nanoparticle, in particular the absorption cross section, using COMSOL Multiphysics. My model seems to be getting correct values for the absorption coefficient and...
View full post »

Similar threads

How does changing projector lenses affect brightness?
Replies
15
Views
4K
I How to couple light from a very small source into spectrometer?
Replies
10
Views
1K
I Image appears outside of q -- Lens Maker's Equation confusion
Replies
17
Views
3K
I Condenser lens retrofit for a lighting application
Replies
24
Views
2K
Simulate other lenses with Time of Flight (ToF) camera
Replies
22
Views
4K
I Understanding magnification of concave mirrors for near-eye situation?
Replies
11
Views
2K
I How Can I Build an Effective DIY Helmet-Mounted HUD?
Replies
19
Views
3K
Alternative to bifocal and varifocal spectacle lenses?
Replies
18
Views
6K
Sensor "pixels" count vs digital image output pixels count
Replies
8
Views
2K
Optics: Working out distance of an object from single digital camera using the captured image
Replies
3
Views
2K

Hot Threads

Recent Insights

Back
Top