A Site for Photographers by Photographers

Community > Forums > photo.net > Lenses > Simple Lens Diagram

Featured Equipment Deals

Factors to Consider when Choosing a Digital SLR Camera Read More

Factors to Consider when Choosing a Digital SLR Camera

Read about how to choose a DSLR camera from Photo.net. We take a look at everything from Format size, Image stabilization systems, metering, etc. Includes example images.

Latest Equipment Articles

Lensbaby Spark Review Read More

Lensbaby Spark Review

This inexpensive gadget does indeed spark your creativity. Read on to see how.

Latest Learning Articles

26 Creative Photos of Water Drops Read More

26 Creative Photos of Water Drops

These absolutely amazing macro photographs feature a tiny elemental thing that can hold a lot of mystery. Take a moment to enjoy these photographs of water drops.


Simple Lens Diagram

Jeffrey Rodgers , Dec 21, 1999; 03:23 p.m.

I am attempting to help beginners understand the terms used for camera lenses. There seems to be confusion about aperture and "f-stop". Is anyone intersted in seeing a diagram with explanation of terms used for a simple lens? I hope this helps... Click on my name and check out "portrait". Read text also.

Responses

Wayne DeWitt , Dec 22, 1999; 12:10 a.m.

You must have a point - I don't know what it is though. We tend to leave the "actual" aperture to the astronomers and the astrophotographers (I don't care if my 200mm f/4.0 lens has a 50mm aperture) - they care more than most other photogs. I guess we could all start saying "effective aperture" if it would make you happy. I would rather you spent your time explaining "t-stops" to people (it would help them to understand why a 5" 1000mm mirror isn't the same as a 5" 1000mm refractor), it would be more educational with regards to actual earth-bound photography. We use many misnomers in everyday language, it's just one more.

Jeffrey Rodgers , Dec 22, 1999; 01:50 a.m.

I don't really care if everyone uses proper optical terms. I just want them to understand how a camera lens works. I thought a picture would be helpful. However, a diagram of an actual camera lens would be better. Maybe some people are happy memorizing settings and techniques, but I like to understand how a camera lens works and why it works(or doesn't).

Wayne DeWitt , Dec 22, 1999; 10:35 a.m.

I stopped trying a long time ago to correct everyone I met on the usage of the word "aperture", they tend to look at you strangely after the monologue is over. I was serious about the "t-stop" thing though, I bet 9 out of 10 photographers (maybe 99 out of 100 in theses "auto-everything" days) are not aware that that they misunderstand the meaning of the term f-stop (as well as aperture). Didn't see reference to it on your site (forgive me if I missed it).

Alan Gibson , Dec 22, 1999; 11:37 a.m.

What you have called a 'field stop' is actually an 'aperture stop'. A 'field stop' would be at the focal plane.

Jeffrey Rodgers , Dec 22, 1999; 02:39 p.m.

OK, I am going to redo diagram showing an actual camera lens design. If anyone knows where I can find detailed info on lens elements & iris position of a common camera lens(50mm.)let me know. Sorry if I have caused more confusion to those of you trying to learn about lenses. In the meantime, I'm removing the diagram.

Back to top

Notify me of Responses