Given the many claims about "self-built lens and is no longer available the old link where I explained how I had made, I try to summarize in this space, its implementation.
Meanwhile premetto that "virtually" anything I do not have DIY in the sense that I just tried, tried and tested different types of lens converters to achieve a higher RR (reproduction ratio) of the subject.
using for macro photography, mainly a bridge for the accuracy and the Panasonic Lumix FZ50, the choice of the add optical was the only way (because there is no possibility as in the reflex change of purpose or use spacer rings or bellows).
The first tests were carried out using a set of close-up lens of Marumi (+1, +2, +4).
When working in the field of these lenses is shown immediately issue a drop in sharpness at the edges of the frame, falling slightly perceptible using the lens shade +1, but very clear with the lens + shade 4, this should be added especially with the use of lenses +4 +2 and a heavy production of chromatic aberrations. All of course amplified by combining slow closeup.
From what I have drawn as a conclusion that can be used only with a good quality lens shade +1 (which in the case of my camera to the maximum 420mm telephoto brings the minimum focusing distance of about 2 meters by 1 meter nominal), this allows you to easily take subjects not too small to be a safe distance, just about one meter (Lepidoptera is good for medium / Large type scarce swallowtail, swallowtail and dragonflies.
not fully satisfied with the quality achieved, I tried to remove various binoculars, almost all lenses with red highlights, from the evidence I have obtained a magnification ratio similar to the strength of the lens closeup +4, I noticed a minor decrease of sharpness at the edges (almost absent in fact) but the whole picture turns green for cui le cromie non rispondono alla realtà.
Nei vari tentativi mi è capitato un monoculare Russo, smontato la lente frontale, ho notato che è un doppino acromatico, per cui le aberrazioni vengono corrette, montato davanti l'obiettivo alla meglio (tramite un adattatore di fortuna e del nastro isolante, ho notato che sia la caduta di nitidezza che le aberrazioni sono invisibili ad occhio nudo, inoltre raggiunge (sempre al massimo zoom 420mm) circa lo stesso RR della lente closeup +4.
Most of these macro photos in my albums are made just with this lens coupled FZ50 + self made.
Because you have even a DSLR (Olympus E-510) I tried to mount the lens in front of the lens as a kit supplied with the machine itself (ZD 40-150 zoom) and I must admit that while not getting the same RR that I get on the FZ50 (also because of the canvases in this case stops at 150mm "300mm equivalent to 35mm, 420mm against the FZ50), but the image quality obtained in terms of meeting le mie attuali esigenze.
Qualche foto realizzata con tale lente:
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