The next step for RF focus

[tobey bilek]

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Since we are forced to focus/recompose, this could be the solution.

 

Hasselblad H4x camera hands-on review: back to open architecture!

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[adan]

Connect the dots for me....how does a feature requiring autofocus (motorized adjustment of focus) apply to a manual rangefinder system?

[lm_user]

Just guessing?? An electronically adjustable microfocus that accounts for trigonometry after I tell the camera the subject is in focus. With mf lenses I assume the sensor would have to move to make the correction.

 

So I focus with a rangefinder to adjust the lens to sensor distance and then the sensor moves to account for trigonometry. An in camera accelerometer or other means would be required to determine the change in angle and software and motors would move the sensor

 

Fun thinking -but sounds complicated.

 

Sensor moving technology could also be used to fine tune focus in camera to match specific lenses with bodies - similar to Nikon. No need to send the lens to Solms. OK now I have gone too far - I dont think I understand enough about lens calibration to know if that could actually work

 

More fun thinking ... Now that I can move the sensor I could add focus detection and logic and eliminate mf

 

I think the dots just formed a circle - I am back to Andys question

[MichaelRabern]

Electronic indicator. Subtle, unobtrusive.

[philipus]

I read about the True Focus technology a while back and find it very interesting.

 

On my EOS cameras I have always and only ever used the centre AF point because I cannot understand why I would want to leave it to chance where focus ends up. So I have always recomposed - sometimes a little, sometimes a lot depending on the scene, distance etc - my photos. I can't say that I have often found any shift in the focus plane annoying but it may have snuck in errors on occasion. I accept that for professional photographers such errors may be a real issue.

 

I am wondering why Hassy hasn't just added user selectable focus points. Given that those cameras are largely used in studio settings, this would seems to me (but what do I know) a simpler solution.

 

And, to come to the issue of the application of something akin to True Focus to a rangefinder, I am wondering if a tiny nudge on the aperture ring couldn't accomplish the same - or similar - result.

[mjh]

I am wondering why Hassy hasn't just added user selectable focus points.

Because they don’t have an AF sensor supporting multiple AF points. Canon and Nikon have been developing their own AF sensors while Hasselblad has to make do with what is available. (Having said that, I think this is a really nice solution in that it allows photographers accustomed to focus-and-recompose to continue to work in the way they prefer, just with increased accuracy.)

[Rick]

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Yes, this is the dirty little secret of focus recompose. Not as accurate as having a focus point on you subject.

 

For a subject 8' away and assuming that you recompose 20°; *delta= 15cm (behind the subject in the Hasselblad example).

 

Could explain a lot of back focus issues.

 

Take home lesson for M shooters; focus in front of your subjects eyes a few inches.

 

 

Thanks for the link Tobey.