Timeline for How does one get manual focus right with a fast-aperture lens?
Current License: CC BY-SA 2.5
4 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Aug 13, 2010 at 7:44 | comment | added | Dave Van den Eynde | This discussion, though technical, gives a rather good insight in how phase-detection autofocus works: photography-on-the.net/forum/showthread.php?t=829772 | |
| Aug 13, 2010 at 7:35 | comment | added | Dave Van den Eynde | Canon does. They specify for their AF sensors whether they are cross-type or not, and at what aperature the cross effectively becomes used. They also state the maximum aperture value that a lens wide open can be used. The SIGMA 50-500 "BIGMA", for example, has a maximum aperture of F/6.3 at the long end, but it has to lie to Canon camera's that it's effectively F/5.6 so that the camera won't refuse to autofocus as all but the 1D series cameras can autofocus up to F/5.6 with the center focus point. | |
| Aug 13, 2010 at 2:46 | comment | added | emit | I think this is the best explanation to what happens with my gear. Do camera specs provide the value of the fixed depth-of-field? I haven't found on the specs of Pentax K10D. | |
| Aug 11, 2010 at 7:36 | history | answered | Dave Van den Eynde | CC BY-SA 2.5 |