 | | |||||||
|  |
 | > |
| Pentax DSLR Discussion Talk about Pentax Digital SLR modes, technique, operation, and problems here (K and *ist D series). |
 |
| | Thread Tools | Search this Thread | Display Modes |
| 03-03-2008, 10:41 AM | #1 |
| Loyal Member Location: Chicagoland Gallery Photos:
0
Posts: 332 | Aperture and AF speed? Just curious, does the max lens aperture change the AF speed of the camera? I know pentax gets a little slow in low light, so wondering if going from f/3.5 kit to a f/2.8 lens would improve that. |
|
| 03-03-2008, 10:53 AM | #2 |
| Pentaxian Location: Ste-Anne des Plaines, Qc., Canada Gallery Photos:
0
Posts: 1,615 | It does change the AF speed , since the smaller aperture doesn't allow as much light to reach the AF sensor. The difference is almost nothing in bright light, but in low light, a lens with an opening of 1.4 will be quite a bit faster to focus than one with an opening of only 5.6. |
|
|
| 03-03-2008, 11:11 AM | #3 |
| Pentaxian Location: steel city / rust belt Gallery Photos:
0
Posts: 1,447 | nice document talking about principles of AF (Phase Comparison AF) systems : http://doug.kerr.home.att.net/pumpkin/Split_Prism.pdf |
|
|
|
« Previous Thread
|
Next Thread »
| Thread Tools | Search this Thread |
| Display Modes | |
Linear Mode
| |
All times are GMT -7. The time now is 02:34 PM.