Headline - DSLRs have imprecise focusing due to their mirrors

Started Apr 5, 2014 | Discussions thread
Bill Robb Senior Member • Posts: 3,332
Re: Makes sense to me
1

Camley wrote:

Leonard Migliore wrote:

Greg A A wrote:

peevee1 wrote:

Live view on DSLR is not "just like mirrorless camera", it is awfully slow. And mirror does not give you better image quality, it only gives you imprecise focusing.

Interesting premise; DSLRs have imprecise focusing because of their mirror.This is one of the wildest claims I have yet heard. Can you back that up with some facts?

Well, the phase detect autofocus assembly is at the bottom of the mirror box. It senses focus indirectly and the path length can be affected by mechanical inaccuracy. That's why the first thing you do when you have focus problems with a DSLR is to focus in live view; that's the only way to focus directly on the sensor. And it's why micro focus adjust is such a valuable feature.

So I don't see it as a wild claim at all.

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Leonard Migliore

This revelation has really shaken me up.

I'm re-looking at all my images taken using various DSLs to see why I thought they were sharp and well focussed.

I wonder how all those thousands of sharp images taken using DSLRs (including those taken by most professional photographers) could have happened with this huge flaw.

Interestingly, I have several thousand exposures that are just slightly out of focus that were taken with a DSLR. At least half of the pictures I have taken over the years with auto focus DSLR cameras are not quite in focus.

However, what you are saying bears no relationship at all to what the OP was saying.  Perhaps you should try to stay on topic.

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