----------------------------------- Stanescu Octavian 30 Noi 2007 09:58 ----------------------------------- Daca ai o sapuniera de stricat poti incerca sa-l demontezi cu grija si sa incerci sa scoti doar lentilele montura lor s-o pui la loc goala . la pornire isi face initializarea , are senzori (contacte ) el misca obiectivul inainte inapoi si daca contactele nu sunt atinse da eroare . si pune-l daca are mod manual , altfel daca nu poate clarifica imaginea iar da eroare. Referitor la Nikon d3 as fi bucuros sa poata asemenea ISO , adio montura ghdata URA,URA!!!!.dar nu cred ca se poate vedea ceva de zgomot ,sau o fi ceva ciopartit de softul intern ne Low noise. Am gasit ceva concluzii de la teste fata de 40D canon: Conclusion The readout noise of the Nikon and Canon CMOS detectors is very similar. The high ISO sensitivity displayed by Nikon is for the marketing: Nikon D3 CMOS (and also the CMOS D300 CMOS - Sony origin) is a very high quality sensor, but in the end, Nikon just rises now the level of Canon technology. The behaviour of Nikon DSLR are radically different from the Canon ones for long exposure: - For Nikon, the hot pixels are eliminated by a sophisticated digital processing external to the sensor. During this digital processing, the signal of the neighboring pixels is also affected. The damage of such processing is well-known in astronomy: the weak stars are also eliminated and the image loose photometric qualities on stellar like objects. - For Canon, the thermal signal is reduced for each pixel by a differential reading method. The thermal signal level measured at the output of the sensor is very low. The residual can efficiently be removed during the image processing (a simple substraction of a reference dark signal map). It is tragic to see that Nikon solved the problem of thermal signal by a digital processing of the RAW files (i.e. NEF files do not contain true raw data). This processing can surely meet the daytime users and the high performance for main application is evident. But by repeating the same mistake made on the D70 and the D200 (equipped with a CCD) on the news Digital SLR Nikon probably divorces once more with the astronomical community. Today the Canon and Pentax cameras seem to be the only ones useable digital SLR for efficient and advanced astronomy