New to Digital, but Experienced

Started 8 months ago | Discussions thread
Doug Pardee
Doug Pardee Veteran Member • Posts: 9,247
Re: Mirrorless AF -- positive points

It occurs to me I failed to mention two positive points about mirrorless AF when compared with DSLR.

1. No front/back focus. Contrast-detect (hunting) AF is inherently incapable of front/back focus, because it adjusts the lens until the target is in focus on the imaging sensor. Phase-detect AF doesn't have to deal with misadjustment of the AF sensor distance -- the main cause of front/back focus issues -- because the  AF sensor and the imaging sensor are one and the same. Conceptually, phase-detect AF is still susceptible to the lens not doing exactly what the camera tells it to do, but in practice that seems to be quite rare and generally indicates a faulty lens.

2. Wider AF point spread with more AF points. Contrast-detect (hunting) AF can be done on any part of the image, even the extreme corners. The spread of phase-detect is still somewhat restricted by the optics, but tends to be wider than many non-Pro DSLRs. The number of AF points a camera offers is mainly limited by processing power and usability considerations.

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