Headline - DSLRs have imprecise focusing due to their mirrors

Started Apr 5, 2014 | Discussions thread
OP (unknown member) Contributing Member • Posts: 969
When AF is good enough it just isn't an issue in which camera you choose
2

peevee1 wrote:

And DPR had their PDAF fine-tunes - most DSLRs sold (which are Rebels and similar junk from Nikon) don't even have fine-tuning, missing focus every time and differently with every lens (and every focal length of every zoom).

I doubt that those owners of Rebels and other such Nikon cameras would rate their cameras as junk. They would be considered good cameras for their use. Would most consumers shooting with a Rebel in automatic mode notice if their camera focus was off by a small amount?

If you measure to a close enough tolerance you would find small focusing errors with the best mirrorless contrast AF. I doubt folks claim contrast detect is absolutely perfect. The question is how accurate does the focus have to be? For most users of low end cameras, DSLRs, mirrorless, compact ..., a slight miss focus wouldn't be noticed. If you are at f8 in a typical situation a small focus error will be indistinguishable. .

Those users that really care about focus accuracy probably have high end cameras with lenses that can utilize those cameras. If it's a high end DSLR they can use AF fine tune if there is a concern. Beyond theoretical dissertations high end DSLRs with PDAF focus accurately. This has been shown through actual measurements and by photographers results. In the majority of situations it's not necessary to focus your DSLR manually or use live view.

AF just isn't an issue to cause someone to avoid a DSLR. Other ergonomic issues such as viewfinder, features, size and weight are the primary reasons most people should consider when choosing a camera.

f8 and be there

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