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sent on April 16, 2024 (12:23) | This comment has been automatically translated (show/hide original)
It's just a technical photo, unpretentious. I experimented with the use of a refractor designed for astronomy for terrestrial photography. This is a 420ED f/6. It is light, it could also be used freehand but only with immobile subjects. But with this focal length, all you have to do is move the lens a few millimeters and the frame goes to be blessed. I have found that the best use is with a tripod equipped with a rack and pinion head. Those with three movements, when you go to tighten the lever there is inevitably a minimum displacement, not to mention the ball ones. For landscape photography it can be an excellent solution. In addition, astronomical eyepieces can be added and the magnifications reach levels that are impossible for a telephoto lens. The ED glasses of the refractor give a high image quality, limited only by atmospheric haze, but free of chromatic aberrations. E' solo una foto tecnica, senza pretese. Ho sperimentato l'uso di un rifrattore progettato per astronomia per la fotografia terrestre. Trattasi di un 420ED f/6. E' leggero, si potrebbe usare anche a mano libera ma solo con soggetti immobili. Però con questa focale basta spostare l'obbiettivo di qualche millimetro è l'inquadratura va a farsi benedire. Ho constatato che l'uso migliore è con un treppiede munito di testa a cremagliera. Quelle a tre movimenti quando si va a serrare la leva inevitabilmente si ha un minimo spostamento, per tacere di quelle a sfera. Per una fotografia paesaggistica può essere una eccellente soluzione. Inoltre si possono aggiungere oculari astronomici e gli ingrandimenti raggiungono livelli impossibili per un teleobbiettivo fotografico. I vetri ED del rifrattore danno un'alta qualità di immagine, limitata solo dalla foschia atmosferica, ma priva di aberrazioni cromatiche.
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