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Solution to 39mm to 52mm Macro Coupler?

Started 9 months ago | Questions thread
3D Gunner Senior Member • Posts: 1,025
Re: Solution to 39mm to 52mm Macro Coupler?

I give you a quote from an article about "Extreme Macro":

"You maybe tempted to try using a macro lens as the rear lens (ie the longer one), but be aware that this is not necessarily a route to success. Macro lenses tend to have the front element recessed into the body of the lens, and you really want the front element as close to the reversed lens as possible. And with macro zoom lenses as the rear lens, the front pupil might be too far back. Both of these will lead to vignetting."(Johan J Ingles-Le Nobel)

For the lenses in this discussion, the front elements are not too recessed into the body of the lenses, so -+few millimeters may not influence the optical system.

Longer distances between reversed lenses can induce vignetting at high apertures. I can confirm that for some situations.

Vignetting usually does not occur with close-up lenses used on lenses with normal or long focal lengths, because they have a large open surface, but may occur if used on wide-angle lenses.

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