Headline - DSLRs have imprecise focusing due to their mirrors

Started Apr 5, 2014 | Discussions thread
Lee Jay Forum Pro • Posts: 52,237
Re: Headline - DSLRs have imprecise focusing due to their mirrors

Lee Jay 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?

-- hide signature --

f8 and be there

It only makes sense . It is always difficult to fine tune any two different light paths to be exactly the same distance . And when they must also have the exact same distance over the area of a flat sensor and a focus screen , the difficulty gets complicated .

In My opinion , it should all be done on the sensor using only one light path .

Dusty

That isn't how dSLRs work. The light paths aren't the same length and they aren't designed to be.

The difference in light path length is calibrated out in a software adjustment. The only requirement is that the difference remain constant.
--
Lee Jay

If as you say the two light paths ( one for the view screen and one for the sensor ) are not the same distance from the lens then this explains why i have so much difficulty getting sharp photos .

It also explains what pot is doing to Japanese engineers . First Fukashima now the cameras .

No wonder we all need to deal with front focus and back focus endlessly , and still have unpredictable results .

I am not disputing what you say , I am only proving what you say , So please don't think bad of me .

Dusty

The light paths to the sensor and focusing screen are the same, the ones to the image sensor and autofocus sensors are different.
--
Lee Jay

 Lee Jay's gear list:Lee Jay's gear list
Canon IXUS 310 HS Canon PowerShot SX260 HS Canon EOS 5D Canon EOS 20D Canon EOS 550D +22 more
Post (hide subjects) Posted by
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark MMy threads
Color scheme? Blue / Yellow