100mm lens f/2 or f/2.8?!?!

[gumtee]

Hi guys
Looking to buy a new camera

When buying a 100mm lens what is the difference between f/2 and f/2.8!?
Think I’ve ordered a canon 100mm f/2 but noticed that most dentists use 100mm f/2.8. Should I return it ?!?!

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[Awarara]

An f2 camera lens is better than an f2.8. Although I dont imagine you would even use that low of an f stop in the office so it doesn't matter.

 

[gumtee]

An f2 camera lens is better than an f2.8. Although I dont imagine you would even use that low of an f stop in the office so it doesn't matter.

Thank you that’s what I thought but had a mini panic

 

[gumtee]

@Awarara do you know if whether the lens is macro or not is important or not ? I don’t think the lens I bought is macro ...

 

[Svart Aske]

For dental photography you won’t be using a wide aperture so what the F number is doesn’t really matter. However a macro lens allows close focusing which may be needed if you need to take a picture of a single tooth at very close range.

 

[gumtee]

For dental photography you won’t be using a wide aperture so what the F number is doesn’t really matter. However a macro lens allows close focusing which may be needed if you need to take a picture of a single tooth at very close range.

Thanks. I’ll double check when it arrives but I imagine I will have to return it

 

[free99]

With a focal length of 100mm I don't think you're going to be close enough to the subject for a macro to really matter. Assuming the f2 lens you bought doesn't have an absurdly long minimum focus distance then you should be good without the macro function. Now if you had a shorter focal length, like 35 or 50, you'd be much closer to the subject and probably want macro.