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| sent on July 27, 2020 (13:47) | This comment has been automatically translated (show/hide original)
Nice photograph, congratulations.
I may ask you how you can avoid the movement effect of stars and planets? Bella fotografia, complimenti.
Posso chiederti come riesci ad evitare l'effetto movimento di stelle e pianeti? |
| sent on July 28, 2020 (10:20) | This comment has been automatically translated (show/hide original)
A little bit of movement, if you get very close to the subject, you see, because the exposure times, without an astro-guiper, are quite short and you need to be careful not to overdo it. The calculation is very simple and is called the rule of 600 (or 500 is fine the same). Basically based on the lens capture focal point (of course if you have a Canon APS-C you have to multiply the lens focal by 1.6, whereas for the Nikon APS-C you have to multiply by 1.5), then you have to divide it by 600 (or 500), thus managing to calculate the maximum laying times for the focal one. However the photo I had to process with a specific software (Adobe Lightroom), using the file in CR2 format and not a JPG. Un po' di movimento, se avvicini molto il soggetto, si vede, perché i tempi di esposizione, senza un astroinseguitore, sono piuttosto brevi e bisogno stare attenti a non eccedere. Il calcolo è molto semplice e si chiama regola del 600 (o del 500 va bene lo stesso). In pratica in base alla focale di acquisizione dell'obiettivo (naturalmente se hai una Canon APS-C devi moltiplicare la focale dell'obiettivo per 1,6, mentre per la Nikon APS-C devi moltoplicare per 1,5), devi poi dividerla per 600 (o 500), riuscendo così a calcolare i tempi massimi di posa per quella focale. Comunque la foto l'ho dovuta poi elaborare con un software specifico (Adobe Lightroom), usando il file in formato CR2 e non un JPG. |
| sent on July 28, 2020 (10:58) | This comment has been automatically translated (show/hide original)
Thank you Mauro for the clarifications. Grazie Mauro per i chiarimenti. |
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