Can I approximate the max focus distance for extention tubes?

Started 4 months ago | Discussions thread
mga010 Regular Member • Posts: 448
Re: Can I approximate the max focus distance for extention tubes?

mangurian wrote:

I want to use 27mm of extention tube on a Canon EF-100mm macro lens.

Is there any way to approximate what the maximum focus distance will be or is it too dependent on the actual lens design?

thanks,

F+F^2/E should be pretty close. In your case, 100+100*100/27 which is roughly 470mm.

Update: That's measured from the lens. You can add another F+E from the sensor, so roughly 60cm.

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Nikon Z5 Nikon Z 50mm F1.8 Nikon Z 24-200mm F4-6.3 VR Nikon Nikkor Z 28mm F2.8
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