I think the concern is the force (aperture stop down mechanism) need
to operate the extension tube(s), auto-tube and lens together.
C.H.Ling
Andrew Gullen wrote:
>
> In the manual for my 65-116 tube, in the "care for use" list, it says not to
> add any other sort of extension. I was thinking of doing so to get closer to
> 2X with the 80f4 (I haven't found the 170mm closeup lens yet).
>
> Does anyone know why this isn't a good idea?
>
> Andrew
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