Using Macro Extension Rings for People Portraits

Started 2 months ago | Questions thread
OP charley5 Senior Member • Posts: 2,253
Re: Using Macro Extension Rings for People Portraits

BBbuilder467 wrote:

charley5 wrote:

Dem Bell wrote:

Holger Bargen wrote:

Don't know if it helps - but if you look at this calculator you can see whatt happens if you add extension tubes:

Just go up with the extensiontubes and see what happens with magnification and DOF.

Be careful interpreting the results from this calculator. "Focusing distance" is the distance at which the lens is in focus without the extension tube attached. For example, if you set infinity focus by using the distance marks on the lens barrel while it is attached to an extension tube, the "focusing distance" required by this calculator is infinity while things that are actually in focus will be much closer to the camera (because of the use of the extension tube). Confusing, right?

Ouch. I can't deal with this. For me, photography is a pleasure, not a math problem. Although I understand that other people have a different view on what is pleasurable or not.

It's all about the math. You said that you are adding extension tubes to an 80mm lens and doing portraits from 7 feet away.

20mm tubes with an 80mm lens at infinity should be 1:4. A postcard would barely fit in the frame.

I don't know how you can be using 2 of 3 extension tubes and still do portraits.

That's a good question. The helical focusers (I am using two) add even more extension, in fact, a lot of extension. Here is my setup:

To be honest, I may be 6 or 8 feet away from the subject. I don't remember for sure.

What do you think?

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