jyc860923
Top Veteran
- Location
- Shenyang, China
- Name
- 贾一川
Having used film SLR and RF in the early years and now mirrorless for about 8 years, some of you know I've got myself a used DSLR dirt cheap and I intend to have some fun with it. Although I've used some DSLRs briefly in the past I really want to understand how to get the most with its AF system.
Take PDAF for example, with the on-sensor phase detection AF you get an illustration of AF points, but there aren't actually "points", they are arrays of thousands of AF pixels, translated by the processor to give the user the ability to choose points to focus on.
So what about the AF points found in DSLRs? They use the dedicated chip under the mirror box which provides, for example 9 points, 11 points, 45 points, does that mean they're actually the only points you can focus on or do they have something that works to fill in the gap between points, because I often find it funny that people even bother to test the tracking capabilities of DSLRs that have a few or dozens of AF points, how are they supposed to track if there's nothing between those tiny little dots?
Take PDAF for example, with the on-sensor phase detection AF you get an illustration of AF points, but there aren't actually "points", they are arrays of thousands of AF pixels, translated by the processor to give the user the ability to choose points to focus on.
So what about the AF points found in DSLRs? They use the dedicated chip under the mirror box which provides, for example 9 points, 11 points, 45 points, does that mean they're actually the only points you can focus on or do they have something that works to fill in the gap between points, because I often find it funny that people even bother to test the tracking capabilities of DSLRs that have a few or dozens of AF points, how are they supposed to track if there's nothing between those tiny little dots?