Use of extension tube on Sony A7M2

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gp ken
gp ken New Member • Posts: 11
Use of extension tube on Sony A7M2

I needed to get a closeup shot and rather than purchase a Macro lens, I bought a set of auto-focus extension tubes instead. The result was a dismal failure. The images were only in focus in the center while the edges were all very much out of focus.

In my humble analysis, I believe that the problem is that the because the design of the Sony mirrorless lenses is tailored to achieving a flat field from such a close proximity of lens to sensor that this can only be achieved at only one given lens to sensor distance. Changing this distance by using a extension tube alters this distance and consequently distorts the field.

Any comments?

 gp ken's gear list:gp ken's gear list
Sony a7 II Sony FE 35mm F2.8 Sony FE 55mm F1.8 Sony FE 28mm F2 Sony FE 85mm F1.8 +1 more
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