20-09-2018, 12:40 PM
(This post was last modified: 20-09-2018, 12:44 PM by ppppenguin.)
I doubt anyone cared to much about the cumulative effect of 405>625>405. Actually I don't think it would have been too bad, as 625 has more lines.
The Apollo 11 pictures from the moon's surface were relayed to earth at very non-standard line and field rate. They were converted optically to 525 at the ground stations. I don't know if later missions used electronic conversion. The colour cameras on later Apollos were field sequential, with a colour wheel in front of the tube. I think the greatest loss of picture quality was on the moon to earth link. Everything else was fairly minor. 405 wouldn't have been a factor here. Initial conversion was to 525, then to 625 for Europe. The only conversion to 405 in 1969 onwards would have been at 405 TX sites.
https://www.tvtechnology.com/news/equipp...television
The Apollo 11 pictures from the moon's surface were relayed to earth at very non-standard line and field rate. They were converted optically to 525 at the ground stations. I don't know if later missions used electronic conversion. The colour cameras on later Apollos were field sequential, with a colour wheel in front of the tube. I think the greatest loss of picture quality was on the moon to earth link. Everything else was fairly minor. 405 wouldn't have been a factor here. Initial conversion was to 525, then to 625 for Europe. The only conversion to 405 in 1969 onwards would have been at 405 TX sites.
https://www.tvtechnology.com/news/equipp...television
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
