We sell quite a few of the Vivitar three extension tube sets
(12mm,20mm,36mm). Paul.
Paul Farrar wrote:
> > Thanks all for the extension ring info. So, I think that means I need a
> > 25mm for my 50/1.8? Do they make 12 or 13s so you can get 1:2, or put
> > the together to get 1:1? Thanks, John.
> >
>
> No. Not for that lens. That lens has 7mm of focus travel built in, so
> you need the full set of 7, 14, and 25mm.
>
> 50/1.8 by itself 0-7mm extension 0 - 0.14X
> 50/1.8+7mm 7-14mm " 0.14 - 0.28X
> 50/1.8+14mm 14-21mm " 0.28 - 0.42X
> 50/1.8+14mm+7mm 21-28mm " 0.42 - 0.56X
> 50/1.8+25mm 25-32mm " 0.50 - 0.64X
> 50/1.8+25mm+7mm 32-39mm " 0.64 - 0.78X
> 50/1.8+25mm+14mm 39-46mm " 0.78 - 0.92X
> 50/1.8+25mm+14mm+7 46-53mm " 0.92 - 1.06X
>
> The 50/3.5 macro has 25mm of travel built in, but you still need all
> the tubes for best quality because it has a close-focus correction
> mechanism that is activated by the degree of focus extension, meaning
> you should always use the shortest tubes possible. This lens costs
> about the same as the set of tubes, so if you are only interested in
> 0 - 0.5X, it might be a better buy.
>
> The extension tubes are also very handy for the telephotos because
> most have rather distant close-focus limits.
>
> Paul
>
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