On Fri, 16 Jan 1998 08:58:59 -0800, John Gardner <vu49@xxxxxxxxxxxxxx>
wrote:
>Frank,
>
>I have tried this stacking lens technique several times recently. I
>rather like it. I bought two 49 - 52mm step up rings and then used
>sellotape to fasten them together 52-52 ends. This gives you a
>double-ended 49mm fliter thread.
John, special rings exist for this. It is just a piece of thread tube
about 1/4" long which will fit into two filter threads. One of these
came with the 1.4+1.2 set I bought.
>
>I then used a 50mm f/1.4 reversed onto a 135mm f/3.5. This gives roughly
>2.7 times magnification (50/135). I tried it with a 50mm f/3.5 macro
>reversed onto it, but this displayed bad vignetting in the view finder.
>You could get rid of the vignetting by adding more extension behind the
>135mm lens.
>
>The beauty of this set up is that it is cheap and also you can use the
>prime lens to control DOF, exposure etc. Just leave the reversed lens
>wide open.
Now that is what I would have done. But this lab guy stopped his
reversed 1.2 down! Why?
> For illumination I used a T32 attached to a curly .6m
>cord and fired it in from the side. This gives a lovely glancing sideways
>light which puts texture into your subject. You could use two flashes at
>45 degrees on a macro bracket too. No double cables are needed and its
>super sharp. However, DOF is critical and you need to be sqaure on to
>your subject to get it all in focus. Its excellent for photographing
>coins and butterflies wings (med flies too, I suspect Hank).
>
>Play around with various combos. I'd like to try a 50mm reversed onto a
>200mm for 4x mag but I haven't got a). a 200mm and b). a 55mm filter
>threaded standard lens.
>
>Regards
>
>John.
>
Nice weekend. Frank.
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