What does mm mean on lenses. What is it actually measuring

[Kbarredo]

So I know that the higher the number the farther the zoom. Like a 200mm wont see as far as a 300mm one. But what is it actually measuring. What is 300mm exactly. At first I thought It was the distance the lens extends its front glass.

 

[Malone]

It's measuring magnification. There probably is a formula for the actual distance, but I'm sure there are way too many variables and factors for my mind to even begin to comprehend.

 

[fokker]

Not your personal wikipedia. You should know by now not to ask questions like that on here.

 

[Dao]

mm on the lens, one of them is the filter ring size and the other one is focal length (or effective focal length). And don't mix up with the word zoom. i.e. Tamron 18-270mm lens is 15x zoom while Sigma 150-500mm only have 3.3x zoom.

 

[analog.universe]

Instead of complaining about your question, I'll refer you to this helpful diagram: Focal Length: Optical: Glossary: Learn: Digital Photography Review

(this forum sure is good at complaining though!)

 

[Kbarredo]

Cool thanks. I know its an random question but It was just bugging me.

 

[fokker]

Boy, that was hard.

If you couldn't find that information then good luck understanding it

 

[Kbarredo]

Boy, that was hard.

If you couldn't find that information then good luck understanding it

You know the time you spent coming here being a smartass you could have answered the question by now. It shows what type of person you really are.

 

[fokker]

Well no, I couldn't have answered it because to do so would have require typing a very long a complicated explanation, about something which has already been written about in great detail by people who understand it a lot better than I do. Did you even go to the wikipedia link?

It's just plain lazy and bad forum etiquette to expect people to bend over backwards and answer your questions in a way tailored to your personal level of understanding, when the information is all out there for you to find yourself.

 

[Bitter Jeweler]

Here we go again!

 

[Kbarredo]

Instead of complaining about your question, I'll refer you to this helpful diagram: Focal Length: Optical: Glossary: Learn: Digital Photography Review

(this forum sure is good at complaining though!)

Well no, I couldn't have answered it because to do so would have require typing a very long a complicated explanation, about something which has already been written about in great detail by people who understand it a lot better than I do. Did you even go to the wikipedia link?

It's just plain lazy and bad forum etiquette to expect people to bend over backwards and answer your questions in a way tailored to your personal level of understanding, when the information is all out there for you to find yourself.

Its also bad forum etiquette to complain and not contribute to a thread. If you dont like it dont look at it. If everyone just researched by themselves then this site would only be c&c. Is this not a beginners forum for those beginners who seek help. Am I not at a beginner skill level? I would rather be a lazy man than a smartass trying to start fights. At least I will contribute more because can read this thread if they are wondering he same thing. You on the other hand contribute nothing but sarcasm and complaints. So go ahead spend your time being a jerk its your loss. Just dont do it on my threads.

 

[fokker]

Once again, I refer you to the wikipedia link that I posted, and once again I will say good luck understanding it.

 

[kundalini]

After a quick search.........


Google Image Result for http://kidswestalberton.files.wordpress.com/2010/04/photolibrary_rm_photo_of_baby_being_fed_with_spoon.jpg

 

[RauschPhotography]

 

[Kbarredo]

Once again, I refer you to the wikipedia link that I posted, and once again I will say good luck understanding it.

so then why could you have not just posted it without any smartass sarcastic complaints. Because its in your nature to be a smartass. this is what I meant by "it shows the type of person you are".